Julieta Gomez-Fragoso Yanire Martinez-Martinez 20260330 spreadsheet https://doi.org/10.5066/P13YAAPN The output data package for this data release includes tables with summary results from trend analysis of water quality data from streams in Puerto Rico. The files in this output data package include a summary of the results of 1) Mann-Kendall tests for the entire period of record for each parameter for each site, 2) Seasonal Mann-Kendall Trend tests on both unadjusted and streamflow adjusted concentrations for the entire period of record for each parameter for each site, and 3) Mann-Kendall Trend tests for the following two time periods for each parameter for each site: 2008-2022 (POR1), and 2013-2022 (POR2). The main purpose of these datasets is to provide a summary of the results of all the trend test variations that were included as part of water quality trend analysis for selected streams across the island of Puerto Rico. These trends tests evaluate the data over time and the results indicates the direction (up or down) of the trend, the slope of the trend line, and if the trend is statistically significant. 1958 2022 publication date Complete None planned Puerto Rico -67.2600 -65.3000 18.5100 17.9200 ISO 19115 Topic Category environment Water quality trends Mann-Kendall Trend test Seasonal Kendall Trend test Major ions Ammonia Temperature, water Specific conductance Nitrite Inorganic nitrogen (nitrate and nitrite) Phosphorus Copper Lead Zinc Magnesium Cadmium Chromium Stream flow, instantaneous Dissolved oxygen Total nitrogen Selenium USGS Metadata Identifier USGS:65ae9dd9d34ef34c3506d5a6 None Puerto Rico Caribbean Islands None. Please see 'Distribution Info' for details. None. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Julieta M Gomez-Fragoso U.S. Geological Survey, SOUTHEAST REGION Civil Engineer mailing address

B Street, Lot 38

Bayamon PR 00961 US 787-749-7479 787-749-7401 jgomez-fragoso@usgs.gov R version 2022.02.3 (Build 492) Aldo Marchetto 2021 publication https://rdrr.io/cran/rkt/man/rkt-package.html#heading-0 K.L. White B. E. Haggard I. Chaubey 2004 publication http://www.npshistory.com/publications/buff/tasae-v47n2-2004.pdf Megan E. Shoda Jennifer C. Murphy 2022 publication n/a US Geological Survey https://doi.org/10.3133/sir20225097 No formal attribute accuracy tests were conducted. The numerical results in the output files were compared to time series plots of the data to check for consistency in the slope direction and intercept of any significant trends. These datasets represent the output table from R Studio software after running the Mann-Kendall trend test and its special case, the Seasonal Mann-Kendall test. Users are advised to read the rest of the metadata record for additional details. No formal positional accuracy tests were conducted. No formal positional accuracy tests were conducted. K.L. White B. E. Haggard I. Chaubey 2004 publication http://www.npshistory.com/publications/buff/tasae-v47n2-2004.pdf Digital and/or Hardcopy 1991 2001 publication date White and others, 2004. Removal of concentration variability due to discharge. Aldo Marchetto 2021 N/A https://rdrr.io/cran/rkt/man/rkt-package.html#heading-0 Digital Unknown Unknown Marchetto, 2021 RKT package for statistical analysis in R The rkt package (Marchetto, 2021) for R was used to perform Mann-Kendall and Seasonal-Mann-Kendall trends tests to evaluate temporal trends in water quality data in streams in Puerto Rico. The data used for the trend analysis are available in the input data package of this data release. 20231215 The trend analysis included three schemes: the Mann-Kendall and Seasonal Mann-Kendall Trend tests using non-flow-adjusted data, and the Seasonal Mann-Kendall Trend test using flow-adjusted data (flow effects are removed). Log-transformed data together with the LOESS smoothing technique was used for removing the influence of streamflow on water quality trends (White and others, 2004). 20231215 Trends were evaluated over three time periods: 1) The full period of record for each site and parameter. This analysis was done for all sites and parameters. Note that the period of record varies across different sites and parameters. 2) 2008 – 2022. This analysis was done only for sites with data available for this entire period. 3) 2013 – 2022. This analysis was done only for sites with data available for this entire period. 20221215 trendsummary.xlsx Microsoft Excel format (.xlsx) file containing the results from the Mann-Kendall Trend test over the full length of record. Producer Defined .id Unique site identifier; based on the USGS station number and parameter code. Producer Defined Uniquely identifies each site and parameter combination that was evaluated during the full POR Mann-Kendall Trend testing. StartWY The first water year of a period of record with no gaps great than 3 years. Water year refers to October 1st of the previous year through September 30th of the stated year. Producer Defined 1958 through 2013 The water first year of a period of record with no gaps great than 3 years. Water year refers to October 1st of the previous year through September 30th of the stated year. Producer defined Not sufficient Data Indicates that the criterion associated with the length (at least 10 years) was not met, and therefore trend analysis was not done. Producer defined Too much censored data Indicates that the trend analysis was not done because the selected threshold of less than 50 % censored data for trend analysis was not met. Producer defined EndWY Last water year of trend period. For sites that were active as of 2022, this is 2022; for sites that are inactive as of 2022, this may vary. Water year refers to October 1st of the previous year through September 30th of the stated year. Producer Defined Not sufficient data Indicates that the criterion associated with the length (at least 10 years) was not met, and therefore trend analysis was not done. Producer defined Too much censored data Indicates that the trend analysis was not done because the recommended threshold of less than 50 % censored data for trend analysis was not met. Producer defined 1991 through 2022 Last water year of trend period. For sites that were active as of 2022, this is 2022; for sites that are inactive as of 2022, this may vary. Water year refers to October 1st of the previous year through September 30th of the stated year. Producer defined trend Provides information about whether there is a statistically significant trend in the data and if so, the direction of trend. Producer Defined Not significant Indicates that there is not enough statistical evidence to indicate that there is a trend with 90% of confidence. Producer defined Up Results of the trend test indicate that measured values of the water quality parameter increased over time during the trend period. Producer defined Down Results of the trend test indicate that measured values of the water quality parameter decreased over time during the trend period. Producer defined Too much censored data Indicates that the trend analysis was not done because the selected threshold of less than 50 % censored data for trend analysis was not met. Producer defined Not sufficient data Indicates that the criterion associated with the length (at least 10 years) was not met, and therefore trend analysis was not done. Producer defined None Indicates that the Kendall's Tau coefficient for the trend test was zero and therefore there is no temporal trend in the measured value of the water quality parameter during the trend period. Producer defined tau Kendall's Tau coefficient; a measure of the correlation between the rank of the observed values and their order in time. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined -0.766 0.782 slope Theil-Sen slope of the time series calculated using RKT package in R Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined NR Value not reported because trend is not significant. Producer defined -1.98 through 24.3 Theil-Sen slope of the time series calculated using RKT package in R Producer defined intercept Intercept of the Theil-Sen line; it is manually calculated using the estimate of slope and the median of the data: intercept = y_median – slope*x_median, where y = measured values of the water quality parameter and x = sample date. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined NR Value not reported because trend is not significant Producer defined -48700 through 4470 Intercept of the Theil-Sen line; it is manually calculated using the estimate of slope and the median of the data: intercept = y_median – slope*x_median, where y = measured values of the water quality parameter and x = sample date. Producer defined pvalue The p-value of the obtained Z-score statistic for the Mann-Kendall test. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined 7.57e-11 1 SampleSize Number of samples that were included in the analysis. Producer Defined NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined 18 420 pctCens Indicates the percentage of censored data. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined 0 49.6 pctNAs Indicates the percentage of data with NAs values prior to the data screening. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined 0 62.5 medianConc Value in the middle of the dataset Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined 0.002 576 pct_change Indicates the percentage of change in the predicted magnitude of the water quality parameter from the start year of trend period through the end year of the trend period; calculated using the slope and the intercept values. Predicted magnitude = slope * decimal time + intercept and pct_change = (predicted magnitude of endd year - predicted magnitude of start year) / predicted magnitude of start year * 100. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined NR Value not reported because trend is not significant Producer defined -100 through 130,000 Indicates the percentage of change in the predicted magnitude of the water quality parameter from the start year of trend period through the end year of the trend period; predicted magnitude = slope*decimal time + intercept and pct_change = (predicted magnitude of end year - predicted magnitude of start year) / predicted magnitude of first year * 100. Producer defined MonitoringLocationIdentifier Individual location identifier from the Water Quality Portal retrieval. Identifies the agency and station number. Producer Defined Retrieved from Water Quality Portal. Parameter_Code 5-digit parameter code used by the U.S. Geological Survey to identify the constituent measured and the units of measure. Producer Defined 00095 Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius U.S. Geological Survey 00600 Total nitrogen [nitrate + nitrite + ammonia + organic-N], water, unfiltered, milligrams per liter U.S. Geological Survey 00610 Ammonia (NH3 + NH4+), water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00613 Nitrite, water, filtered, milligrams per liter as nitrogen U.S. Geological Survey 00615 Nitrite, water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00630 Nitrate plus nitrite, water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00631 Nitrate plus nitrite, water, filtered, milligrams per liter as nitrogen U.S. Geological Survey 00665 Phosphorus, water, unfiltered, milligrams per liter as phosphorus U.S. Geological Survey 00915 Calcium, water, filtered, milligrams per liter U.S. Geological Survey 00916 Calcium, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 00925 Magnesium, water, filtered, milligrams per liter U.S. Geological Survey 00927 Magnesium, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 01002 Arsenic, water, unfiltered, micrograms per liter Producer defined 01027 Cadmium, water, unfiltered, micrograms per liter U.S. Geological Survey 01040 Copper, water, filtered, micrograms per liter U.S. Geological Survey 01042 Copper, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01051 Lead, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01090 Zinc, water, filtered, micrograms per liter Producer defined 01092 Zinc, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01147 Selenium, water, unfiltered, micrograms per liter U.S. Geological Survey 38260 Methylene blue active substances, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 50286 Mercury, water, unfiltered, nanograms per liter U.S. Geological Survey 62855 Total nitrogen [nitrate + nitrite + ammonia + organic-N], water, unfiltered, analytically determined, milligrams per liter U.S. Geological Survey 71900 Mercury, water, unfiltered, recoverable, micrograms per liter Producer defined trendsummary_sea.xlsx Microsoft Excel format (.xlsx) file containing the results from the Seasonal Mann-Kendall Trend test over the full length of record. Producer Defined .id Unique site identifier; based on the USGS station number and parameter code. Producer Defined Uniquely identifies each site and parameter combination that was evaluated during the full POR Seasonal Mann-Kendall Trend testing. StartWY The water first year of a period of record with no gaps great than 3 years. Producer Defined 1958 through 2013 The first water year of a period of record with no gaps great than 3 years. Water year refers to October 1st of the previous year through September 30th of the stated year. Producer defined Not sufficient Data Indicates that the criterion associated with the length (at least 10 years) was not met, and therefore trend analysis was not done. Shoda and Murphy (2022) Too much censored data Indicates that the trend analysis was not done because the selected threshold of less than 50 % censored data for trend analysis was not met. Producer defined EndWY Last water year of trend period. For sites that were active as of 2022, this is 2022; for sites that are inactive as of 2022, this may vary. Water year refers to October 1st of the previous year through September 30th of the stated year. Producer Defined Not sufficient data Indicates that the criterion associated with the length (at least 10 years) was not met, and therefore trend analysis was not done. Producer defined Too much censored data Indicates that the trend analysis was not done because the selected threshold of less than 50 % censored data for trend analysis was not met. Producer defined 1991 through 2022 Last year of trend period. For sites that were active as of 2022, this is 2022; for sites that are inactive as of 2022, this may vary. Water year refers to October 1st of the previous year through September 30th of the stated year. Producer defined trend Provides information about whether there is a statistically significant trend in the data and if so, the direction of trend. Producer Defined Not significant Indicates that there is not enough statistical evidence to indicate that there is a trend with 90% of confidence. Producer defined Up Results of the trend test indicates that measured values of the water quality parameter increased over time during the trend period. Producer defined Down Results of the trend test indicates that measured values of the water quality parameter decreased over time during the trend period. Producer defined Too much censored data Indicates that the trend analysis was not done because the selected threshold of less than 50 % censored data for trend analysis was not met. Producer defined Not sufficient data Indicates that the criterion associated with the length (at least 10 years) was not met, and therefore trend analysis was not done. Producer defined None Indicates that the Kendall's Tau coefficient for the trend test was zero and therefore there is no temporal trend in the measured value of the water quality parameter during the trend period. Producer defined tau Kendall's Tau coefficient; a measure of the correlation between the rank of the observed values and their order in time. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined -0.664 0.593 slope Theil-Sen slope of the time series calculated using RKT package in R Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined NR Value not reported because trend is not significant Producer defined -8.07 through 22.9 Theil-Sen slope of the time series calculated using RKT package in R Producer defined intercept Intercept of the Theil-Sen line; it is manually calculated using the estimate of slope and the median of the data: intercept = y_median – slope*x_median, where y = measured values of the water quality parameter and x = sample date. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined NR Value not reported because trend is not significant. Producer defined -45700 through 16700 Intercept of the Theil-Sen line; it is manually calculated using the estimate of slope and the median of the data: intercept = y_median – slope*x_median, where y = measured values of the water quality parameter and x = sample date. Producer defined pvalue The p-value of the obtained Z-score statistic for the Seasonal Mann-Kendall test. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined 0 1 SampleSize Number of samples that were included in the analysis. Producer Defined NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined 18 420 pctCens Indicates the percentage of censored data. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined 0.0 49.6 pctNAs Indicates the percentage of data with NAs values prior to the data screening. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined 0 62.5 medianConc Value in the middle of the dataset. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined 0.002 576 pct_change Indicates the percentage of change in the predicted magnitude of the water quality parameter from the start year of trend period through the end year of the trend period; predicted magnitude = slope*decimal time + intercept and pct_change = (predicted magnitude of end year - predicted magnitude of start year) / predicted magnitude of first year * 100. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined NR Value not reported because trend is not significant Producer defined -100 through 150000 Indicates the percentage of change in the predicted magnitude of the water quality parameter from the start year of trend period through the end year of the trend period; predicted magnitude = slope*decimal time + intercept and pct_change = (predicted magnitude of end year - predicted magnitude of start year) / predicted magnitude of first year * 100. Producer defined MonitoringLocationIdentifier Individual location identifier from the Water Quality Portal retrieval. Identifies the agency and station number. Producer Defined Retrieved from Water Quality Portal. Parameter_Code 5-digit parameter code used by the U.S. Geological Survey to identify the constituent measured and the units of measure. Producer Defined 00095 Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius U.S. Geological Survey 00600 Total nitrogen [nitrate + nitrite + ammonia + organic-N], water, unfiltered, milligrams per liter U.S. Geological Survey 00610 Ammonia (NH3 + NH4+), water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00613 Nitrite, water, filtered, milligrams per liter as nitrogen U.S. Geological Survey 00615 Nitrite, water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00630 Nitrate plus nitrite, water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00631 Nitrate plus nitrite, water, filtered, milligrams per liter as nitrogen U.S. Geological Survey 00665 Phosphorus, water, unfiltered, milligrams per liter as phosphorus U.S. Geological Survey 00915 Calcium, water, filtered, milligrams per liter U.S. Geological Survey 00916 Calcium, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 00925 Magnesium, water, filtered, milligrams per liter U.S. Geological Survey 00927 Magnesium, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 01002 Arsenic, water, unfiltered, micrograms per liter Producer defined 01027 Cadmium, water, unfiltered, micrograms per liter U.S. Geological Survey 01040 Copper, water, filtered, micrograms per liter U.S. Geological Survey 01042 Copper, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01051 Lead, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01090 Zinc, water, filtered, micrograms per liter Producer defined 01092 Zinc, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01147 Selenium, water, unfiltered, micrograms per liter U.S. Geological Survey 38260 Methylene blue active substances, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 50286 Mercury, water, unfiltered, nanograms per liter U.S. Geological Survey 62855 Total nitrogen [nitrate + nitrite + ammonia + organic-N], water, unfiltered, analytically determined, milligrams per liter U.S. Geological Survey 71900 Mercury, water, unfiltered, recoverable, micrograms per liter Producer defined trendsummary_flow_adj_sea.xlsx Microsoft Excel format (.xlsx) file containing the results from the trend test analysis of flow-adjusted water quality data using the Seasonal Mann-Kendall Trend test. The trend period covered the full length of record for each site-parameter combination. Producer Defined .id Unique site identifier; based on the USGS station number and parameter code. Producer Defined Uniquely identifies each site and parameter combination that was evaluated during the full POR Seasonal Mann-Kendall Trend testing. StartWY The first water year of a period of record with no gaps great than 3 years. Water year refers to October 1st of the previous year through September 30th of the stated year. Producer Defined 1958 through 2013 The first water year of a period of record with no gaps great than 3 years. Water year refers to October 1st of the previous year through September 30th of the stated year. Producer defined Not sufficient Data Indicates that the criterion associated with the length (at least 10 years) was not met, and therefore trend analysis was not done. Producer defined Too much censored data Indicates that the trend analysis was not done because the selected threshold of less than 50 % censored data for trend analysis was not met. Producer defined EndWY Last water year of trend period. For sites that were active as of 2022, this is 2022; for sites that are inactive as of 2022, this may vary. Water year refers to October 1st of the previous year through September 30th of the stated year. Producer Defined Too much censored data Indicates that the trend analysis was not done because the selected threshold of less than 50 % censored data for trend analysis was not met. Producer defined Not sufficient data Indicates that the criterion associated with the length (at least 10 years) was not met, and therefore trend analysis was not done. Producer defined 1991 through 2013 Last water year of trend period. For sites that were active as of 2022, this is 2022; for sites that are inactive as of 2022, this may vary. Water year refers to October 1st of the previous year through September 30th of the stated year. Producer defined trend Provides information about whether there is a statistically significant trend in the data and if so, the direction of trend. Producer Defined Not significant Indicates that there is not enough statistical evidence to indicate that there is a trend with 90% of confidence. Producer defined Up Results of the trend test indicates that measured values of the water quality parameter increased over time during the trend period. Producer defined Down Results of the trend test indicates that measured values of the water quality parameter decreased over time during the trend period. Producer defined Too much censored data Indicates that the trend analysis was not done because the selected threshold of less than 50 % censored data for trend analysis was not met. Producer defined Not sufficient data Indicates that the criterion associated with the length (at least 10 years) was not met, and therefore trend analysis was not done. Producer defined None Indicates that the Kendall's Tau coefficient for the trend test was zero and therefore there is no temporal trend in the measured value of the water quality parameter during the trend period. Producer defined tau Kendall's Tau coefficient; a measure of the correlation between the rank of the observed values and their order in time. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined -0.69 0.75 slope Theil-Sen slope of the time series calculated using RKT package in R Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined NR Value not reported because trend is not significant. Producer defined -0.0913 through 0.0692 Theil-Sen slope of the time series calculated using RKT package in R Producer defined intercept Intercept of the linear fit to the data; it is manually calculated using the estimate of slope and the median of the data: intercept = y_median – slope*x_median. Producer Defined Empty or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined NR Value not reported because trend is not significant. Producer defined -140 through 183 Intercept of the Theil-Sen line; it is manually calculated using the estimate of slope and the median of the data: intercept = y_median – slope*x_median, where y = measured values of the water quality parameter and x = sample date. Producer defined pvalue The p-value of the obtained Z-score statistic for the Mann-Kendall test. Producer Defined Empty data or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined 0 1 SampleSize Number of samples that were included in the analysis. Producer Defined NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined 11 270 pctCens Indicates the percentage of censored data. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined 0 4.9 pctNAs Indicates the percentage of data with NAs values prior to the data screening. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined 0 62.5 flow_adj_medianConc Value in the middle of the dataset. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined -0.555 0.402 flow_adj_pct_change Indicates the percentage of change in the predicted magnitude of the water quality parameter from the start year of trend period through the end year of the trend period; predicted magnitude = slope*decimal time + intercept and pct_change = (predicted magnitude of end year - predicted magnitude of start year) / predicted magnitude of first year * 100. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (at least 10 years) was not met. Producer defined NR Value not reported because trend is not significant Producer defined -100 through 728000 Indicates the percentage of change in the predicted magnitude of the water quality parameter from the start year of trend period through the end year of the trend period; predicted magnitude = slope*decimal time + intercept and pct_change = (predicted magnitude of end year - predicted magnitude of start year) / predicted magnitude of first year * 100. Producer defined MonitoringLocationIdentifier Individual location identifier from the Water Quality Portal retrieval. Identifies the agency and station number. Producer Defined Retrieved from Water Quality Portal. Parameter_Code 5-digit parameter code used by the U.S. Geological Survey to identify the constituent measured and the units of measure. Producer Defined 00095 Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius U.S. Geological Survey 00600 Total nitrogen [nitrate + nitrite + ammonia + organic-N], water, unfiltered, milligrams per liter U.S. Geological Survey 00610 Ammonia (NH3 + NH4+), water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00613 Nitrite, water, filtered, milligrams per liter as nitrogen U.S. Geological Survey 00615 Nitrite, water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00630 Nitrate plus nitrite, water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00631 Nitrate plus nitrite, water, filtered, milligrams per liter as nitrogen U.S. Geological Survey 00665 Phosphorus, water, unfiltered, milligrams per liter as phosphorus U.S. Geological Survey 00915 Calcium, water, filtered, milligrams per liter U.S. Geological Survey 00916 Calcium, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 00925 Magnesium, water, filtered, milligrams per liter U.S. Geological Survey 00927 Magnesium, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 01002 Arsenic, water, unfiltered, micrograms per liter Producer defined 01027 Cadmium, water, unfiltered, micrograms per liter U.S. Geological Survey 01040 Copper, water, filtered, micrograms per liter U.S. Geological Survey 01042 Copper, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01051 Lead, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01090 Zinc, water, filtered, micrograms per liter Producer defined 01092 Zinc, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01147 Selenium, water, unfiltered, micrograms per liter U.S. Geological Survey 38260 Methylene blue active substances, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 50286 Mercury, water, unfiltered, nanograms per liter U.S. Geological Survey 62855 Total nitrogen [nitrate + nitrite + ammonia + organic-N], water, unfiltered, analytically determined, milligrams per liter U.S. Geological Survey 71900 Mercury, water, unfiltered, recoverable, micrograms per liter Producer defined trendsummary_2008_2022.xlsx Microsoft Excel format (.xlsx) file containing the results from the Mann-Kendall Trend test for the time period: 2008-2022 (POR1). Producer Defined .id Unique site identifier; based on the USGS station number and parameter code. Producer Defined Uniquely identifies each site and parameter combination that was evaluated during the time period 2008 through 2022 Mann-Kendall Trend testing. StartWY First water year of trend period. Water year refers to October 1st of the previous year through September 30th of the stated year. Producer Defined No data Indicates that there was no data available within the water years 2008 through 2022. Producer defined 2008 First water year of trend period. Water year refers to October 1st of the previous year through September 30th of the stated year. Producer defined Too much censored data Indicates that the trend analysis was not done because the selected threshold of less than 50 % censored data for trend analysis was not met. Producer defined Not sufficient data Indicates that the criterion associated with the length (water years 2008 through 2022) was not met, and therefore trend analysis was not done. Producer defined EndWY Last water year of trend period. Water year refers to October 1st of the previous year through September 30th of the stated year. Producer Defined No data Indicates that there was no data available within the water years 2008 through 2022. Producer defined 2022 Last water year of trend period. Water year refers to October 1st of the previous year through September 30th of the stated year. Producer defined Too much censored data Indicates that the trend analysis was not done because the selected threshold of less than 50 % censored data for trend analysis was not met. Producer defined Not sufficient data Indicates that the criterion associated with the length (water years 2008 through 2022) was not met, and therefore trend analysis was not done. Producer defined trend Provides information about whether there is a statistically significant trend in the data and if so, the direction of trend. Producer Defined No data Indicates that there was no data available within the water years 2008 through 2022. Producer defined Up Results of the trend test indicates that measured values of the water quality parameter increased over time during the trend period. Producer defined Not significant Indicates that there is not enough statistical evidence to indicate that there is a trend with 90% of confidence. Producer defined Too much censored data Indicates that the trend analysis was not done because the selected threshold of less than 50 % censored data for trend analysis was not met. Producer defined Down Results of the trend test indicates that measured values of the water quality parameter decreased over time during the trend period. Producer defined Not sufficient data Indicates that the criterion associated with the length (water years 2008 through 2022) was not met, and therefore trend analysis was not done. Producer defined None Indicates that the Kendall's Tau coefficient for the trend test was zero and therefore there is no temporal trend in the measured value of the water quality parameter during the trend period. Producer defined tau Kendall's Tau coefficient; a measure of the correlation between the rank of the observed values and their order in time. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (water years 2008 through 2022) was not met. Producer defined -0.783 0.657 slope Theil-Sen slope of the time series calculated using RKT package in R Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (water years 2008 through 2022) was not met. Producer defined NR Value not reported because trend is not significant. Producer defined -6.86 through 17 Theil-Sen slope of the time series calculated using RKT package in R Producer defined intercept Intercept of the Theil-Sen line; it is manually calculated using the estimate of slope and the median of the data: intercept = y_median – slope*x_median, where y = measured values of the water quality parameter and x = sample date. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (water years 2008 through 2022) was not met. Producer defined NR Value not reported because trend is not significant. Producer defined -33600 through 14300 Intercept of the Theil-Sen line; it is manually calculated using the estimate of slope and the median of the data: intercept = y_median – slope*x_median, where y = measured values of the water quality parameter and x = sample date. Producer defined pvalue The p-value of the obtained Z-score statistic for the Mann-Kendall test. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (water years 2008 through 2022) was not met. Producer defined 2.83e-05 1 SampleSize Number of samples that were included in the analysis. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (water years 2008 through 2022) was not met. Producer defined 27 62 pct_change Indicates the percentage of change in the predicted magnitude of the water quality parameter from the start year of trend period through the end year of the trend period; predicted magnitude = slope*decimal time + intercept and pct_change = (predicted magnitude of end year - predicted magnitude of start year) / predicted magnitude of first year * 100. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (water years 2008 through 2022) was not met. Producer defined NR Value not reported because trend is not significant. Producer defined -99.7 through 12100 Indicates the percentage of change in the predicted magnitude of the water quality parameter from the start year of trend period through the end year of the trend period; predicted magnitude = slope*decimal time + intercept and pct_change = (predicted magnitude of end year - predicted magnitude of start year) / predicted magnitude of first year * 100. Producer defined MonitoringLocationIdentifier Individual location identifier from the Water Quality Portal retrieval. Identifies the agency and station number. Producer Defined Retrieved from Water Quality Portal. Parameter_Code 5-digit parameter code used by the U.S. Geological Survey to identify the constituent measured and the units of measure. Producer Defined 00095 Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius U.S. Geological Survey 00600 Total nitrogen [nitrate + nitrite + ammonia + organic-N], water, unfiltered, milligrams per liter U.S. Geological Survey 00610 Ammonia (NH3 + NH4+), water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00613 Nitrite, water, filtered, milligrams per liter as nitrogen U.S. Geological Survey 00615 Nitrite, water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00630 Nitrate plus nitrite, water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00631 Nitrate plus nitrite, water, filtered, milligrams per liter as nitrogen U.S. Geological Survey 00665 Phosphorus, water, unfiltered, milligrams per liter as phosphorus U.S. Geological Survey 00915 Calcium, water, filtered, milligrams per liter U.S. Geological Survey 00916 Calcium, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 00925 Magnesium, water, filtered, milligrams per liter U.S. Geological Survey 00927 Magnesium, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 01002 Arsenic, water, unfiltered, micrograms per liter Producer defined 01027 Cadmium, water, unfiltered, micrograms per liter U.S. Geological Survey 01040 Copper, water, filtered, micrograms per liter U.S. Geological Survey 01042 Copper, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01051 Lead, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01090 Zinc, water, filtered, micrograms per liter Producer defined 01092 Zinc, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01147 Selenium, water, unfiltered, micrograms per liter U.S. Geological Survey 38260 Methylene blue active substances, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 50286 Mercury, water, unfiltered, nanograms per liter U.S. Geological Survey 62855 Total nitrogen [nitrate + nitrite + ammonia + organic-N], water, unfiltered, analytically determined, milligrams per liter U.S. Geological Survey 71900 Mercury, water, unfiltered, recoverable, micrograms per liter Producer defined trendsummary_2013_2022.xlsx Microsoft Excel format (.xlsx) file containing the results from the Mann-Kendall Trend test for the time period: 2013-2022 (POR2). Producer Defined .id Unique site identifier; based on the USGS station number and parameter code. Producer Defined Uniquely identifies each site and parameter combination that was evaluated during the time period 2013 through 2022 Mann-Kendall Trend testing. StartWY First water year of trend period. Water year refers to October 1st of the previous year through September 30th of the stated year. Producer Defined No data Indicates that there was no data available within the water years 2013 through 2022. Producer defined 2013 First water year of trend period. Water year refers to October 1st of the previous year through September 30th of the stated year. Producer defined Too much censored data Indicates that the trend analysis was not done because the selected threshold of less than 50 % censored data for trend analysis was not met. Producer defined Not sufficient data Indicates that the criterion associated with the length (water years 2013 through 2022) was not met, and therefore trend analysis was not done. Producer defined EndWY Last year of trend period. Producer Defined No data Indicates that there was no data available within the water years 2013 through 2022. Producer defined 2022 Last water year of trend period. Water year refers to October 1st of the previous year through September 30th of the stated year. Producer defined Not sufficient data Indicates that the criterion associated with the length (water years 2013 through 2022) was not met, and therefore trend analysis was not done. Producer defined Too much censored data Indicates that the trend analysis was not done because the selected threshold of less than 50 % censored data for trend analysis was not met. Producer defined trend Provides information about whether there is a statistically significant trend in the data and if so, the direction of trend. Producer Defined No data Indicates that there was no data available within the water years 2013 through 2022. Producer defined Not significant Indicates that there is not enough statistical evidence to indicate that there is a trend with 90% of confidence. Producer defined Too much censored data Indicates that the trend analysis was not done because the selected threshold of less than 50 % censored data for trend analysis was not met. Producer defined Not sufficient data Indicates that the criterion associated with the length (water years 2013 through 2022) was not met, and therefore trend analysis was not done. Producer defined Up Results of the trend test indicates that measured values of the water quality parameter increased over time during the trend period. Producer defined Down Results of the trend test indicates that measured values of the water quality parameter decreased over time during the trend period. Producer defined None Indicates that the Kendall's Tau coefficient for the trend test was zero and therefore there is no temporal trend in the measured value of the water quality parameter during the trend period. Producer defined tau Kendall's Tau coefficient; a measure of the correlation between the rank of the observed values and their order in time. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (water years 2013 through 2022) was not met. Producer defined -0.756 0.782 slope Theil-Sen slope of the time series calculated using RKT package in R Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (water years 2013 through 2022) was not met. Producer defined NR Value not reported because trend is not significant. Producer defined -3.5 through 27.8 Theil-Sen slope of the time series calculated using RKT package in R Producer defined intercept Intercept of the Theil-Sen line; it is manually calculated using the estimate of slope and the median of the data: intercept = y_median – slope*x_median, where y = measured values of the water quality parameter and x = sample date. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (water years 2013 through 2022) was not met. Producer defined NR Value not reported because trend is not significant. Producer defined -55600 through 7380 Intercept of the Theil-Sen line; it is manually calculated using the estimate of slope and the median of the data: intercept = y_median – slopex_median, where y = measured values of the water quality parameter and x = sample date. Producer defined pvalue The p-value of the obtained Z-score statistic for the Mann-Kendall test. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (water years 2013 through 2022) was not met. Producer defined 0.00091 1 SampleSize Number of samples that were included in the analysis. Producer Defined NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (water years 2013 through 2022) was not met. Producer defined 17 42 pct_change Indicates the percentage of change in the predicted magnitude of the water quality parameter from the start year of trend period through the end year of the trend period; predicted magnitude = slope*decimal time + intercept and pct_change = (predicted magnitude of end year - predicted magnitude of start year) / predicted magnitude of first year * 100. Producer Defined Empty cell or NA It was not computed because no trend test was performed due to too much censored data or the criterion associated with the length (water years 2013 through 2022) was not met. Producer defined NR Value not reported because trend is not significant Producer defined -99.5 through 28400 Indicates the percentage of change in the predicted magnitude of the water quality parameter from the start year of trend period through the end year of the trend period; predicted magnitude = slope*decimal time + intercept and pct_change = (predicted magnitude of end year - predicted magnitude of start year) / predicted magnitude of first year * 100. Producer defined MonitoringLocationIdentifier Individual location identifier from the Water Quality Portal retrieval. Identifies the agency and station number. Producer Defined Retrieved from Water Quality Portal. Parameter_Code 5-digit parameter code used by the U.S. Geological Survey to identify the constituent measured and the units of measure. Producer Defined 00010 Temperature, water, degrees Celsius U.S. Geological Survey 00095 Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius U.S. Geological Survey 00300 Dissolved oxygen, water, unfiltered, milligrams per liter U.S. Geological Survey 00600 Total nitrogen [nitrate + nitrite + ammonia + organic-N], water, unfiltered, milligrams per liter U.S. Geological Survey 00610 Ammonia (NH3 + NH4+), water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00613 Nitrite, water, filtered, milligrams per liter as nitrogen U.S. Geological Survey 00615 Nitrite, water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00630 Nitrate plus nitrite, water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00631 Nitrate plus nitrite, water, filtered, milligrams per liter as nitrogen U.S. Geological Survey 00665 Phosphorus, water, unfiltered, milligrams per liter as phosphorus U.S. Geological Survey 00720 Cyanide, water, unfiltered, milligrams per liter U.S. Geological Survey 00722 Cyanide, free, amenable to chlorination, water, unfiltered, milligrams per liter U.S. Geological Survey 00900 Hardness, water, milligrams per liter as calcium carbonate U.S. Geological Survey 00915 Calcium, water, filtered, milligrams per liter U.S. Geological Survey 00916 Calcium, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 00925 Magnesium, water, filtered, milligrams per liter U.S. Geological Survey 00927 Magnesium, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 01002 Arsenic, water, unfiltered, micrograms per liter U.S. Geological Survey 01027 Cadmium, water, unfiltered, micrograms per liter U.S. Geological Survey 01033 Chromium(III), water, unfiltered, micrograms per liter U.S. Geological Survey 01034 Chromium, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01040 Copper, water, filtered, micrograms per liter U.S. Geological Survey 01042 Copper, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01051 Lead, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01090 Zinc, water, filtered, micrograms per liter U.S. Geological Survey 01092 Zinc, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01147 Selenium, water, unfiltered, micrograms per liter U.S. Geological Survey 38260 Methylene blue active substances, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 50286 Mercury, water, unfiltered, nanograms per liter U.S. Geological Survey 52139 Total Cyanide, water, unfiltered, mg/l U.S. Geological Survey 52658 Chromium VI, water, unfiltered, recoverable, ug/l to mg/l U.S. Geological Survey 62855 Total nitrogen [nitrate + nitrite + ammonia + organic-N], water, unfiltered, analytically determined, milligrams per liter U.S. Geological Survey 71900 Mercury, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey summary_stats.xlsx Microsoft Excel format (.xlsx) ) file containing the statistical summary of the data analyzed for trend analysis Producer Defined .id Unique site identifier; based on the USGS station number and parameter code. Producer Defined Uniquely identifies each site and parameter combination that was evaluated during the full POR statistics summary calculations. mean Mean value of the dataset. Producer Defined 0.002 644.891 median Value in the middle of the dataset. Producer Defined 0.002 576 stdev Value that represents how close the entire dataset is to the mean value Producer Defined 0.001 272.247 min Minimum value in the dataset. Producer Defined 0.001 316 max Maximum value in the dataset. Producer Defined 0.005 3350 MonitoringLocationIdentifier Individual location identifier from the Water Quality Portal retrieval. Identifies the agency and station number. Producer Defined Retrieved from Water Quality Portal. Parameter_Code 5-digit parameter code used by the U.S. Geological Survey to identify the constituent measured and the units of measure. Producer Defined 00095 Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius U.S. Geological Survey 00600 Total nitrogen [nitrate + nitrite + ammonia + organic-N], water, unfiltered, milligrams per liter U.S. Geological Survey 00610 Ammonia (NH3 + NH4+), water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00613 Nitrite, water, filtered, milligrams per liter as nitrogen U.S. Geological Survey 00615 Nitrite, water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00630 Nitrate plus nitrite, water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00631 Nitrate plus nitrite, water, filtered, milligrams per liter as nitrogen U.S. Geological Survey 00665 Phosphorus, water, unfiltered, milligrams per liter as phosphorus U.S. Geological Survey 00915 Calcium, water, filtered, milligrams per liter U.S. Geological Survey 00916 Calcium, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 00925 Magnesium, water, filtered, milligrams per liter U.S. Geological Survey 00927 Magnesium, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 01002 Arsenic, water, unfiltered, micrograms per liter Producer defined 01027 Cadmium, water, unfiltered, micrograms per liter U.S. Geological Survey 01040 Copper, water, filtered, micrograms per liter U.S. Geological Survey 01042 Copper, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01051 Lead, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01090 Zinc, water, filtered, micrograms per liter Producer defined 01092 Zinc, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01147 Selenium, water, unfiltered, micrograms per liter U.S. Geological Survey 38260 Methylene blue active substances, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 50286 Mercury, water, unfiltered, nanograms per liter U.S. Geological Survey 62855 Total nitrogen [nitrate + nitrite + ammonia + organic-N], water, unfiltered, analytically determined, milligrams per liter U.S. Geological Survey 71900 Mercury, water, unfiltered, recoverable, micrograms per liter Producer defined summary_stats_alldata.xlsx Microsoft Excel format (.xlsx) file containing the statistical summary for all data included in the input data file (prior to data screening and trend testing). Producer Defined .id Unique site identifier; based on the USGS station number and parameter code. Producer Defined Uniquely identifies each site and parameter combination that was evaluated during the full POR statistics summary calculations. mean Mean value of the dataset. Producer Defined 0.002 1267.25 median Value in the middle of the dataset. Producer Defined 0.002 761.0 stdev Value that represents how close the entire dataset is to the mean value Producer Defined 0.0 1663.342 Min Minimum value in the dataset. Producer Defined 0.001 316.0 Max Maximum value in the dataset. Producer Defined 0.005 12100.0 MonitoringLocationIdentifier Individual location identifier from the Water Quality Portal retrieval. Identifies the agency and station number. Producer Defined Retrieved from Water Quality Portal. Parameter_Code 5-digit parameter code used by the U.S. Geological Survey to identify the constituent measured and the units of measure. Producer Defined 00095 Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius U.S. Geological Survey 00600 Total nitrogen [nitrate + nitrite + ammonia + organic-N], water, unfiltered, milligrams per liter U.S. Geological Survey 00610 Ammonia (NH3 + NH4+), water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00613 Nitrite, water, filtered, milligrams per liter as nitrogen U.S. Geological Survey 00615 Nitrite, water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00630 Nitrate plus nitrite, water, unfiltered, milligrams per liter as nitrogen U.S. Geological Survey 00631 Nitrate plus nitrite, water, filtered, milligrams per liter as nitrogen U.S. Geological Survey 00665 Phosphorus, water, unfiltered, milligrams per liter as phosphorus U.S. Geological Survey 00915 Calcium, water, filtered, milligrams per liter U.S. Geological Survey 00916 Calcium, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 00925 Magnesium, water, filtered, milligrams per liter U.S. Geological Survey 00927 Magnesium, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 01002 Arsenic, water, unfiltered, micrograms per liter Producer defined 01027 Cadmium, water, unfiltered, micrograms per liter U.S. Geological Survey 01040 Copper, water, filtered, micrograms per liter U.S. Geological Survey 01042 Copper, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01051 Lead, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01090 Zinc, water, filtered, micrograms per liter Producer defined 01092 Zinc, water, unfiltered, recoverable, micrograms per liter U.S. Geological Survey 01147 Selenium, water, unfiltered, micrograms per liter U.S. Geological Survey 38260 Methylene blue active substances, water, unfiltered, recoverable, milligrams per liter U.S. Geological Survey 50286 Mercury, water, unfiltered, nanograms per liter U.S. Geological Survey 62855 Total nitrogen [nitrate + nitrite + ammonia + organic-N], water, unfiltered, analytically determined, milligrams per liter U.S. Geological Survey 71900 Mercury, water, unfiltered, recoverable, micrograms per liter Producer defined GS ScienceBase U.S. Geological Survey mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/P13YAAPN None 20260330 Julieta M Gomez-Fragoso U.S. Geological Survey, SOUTHEAST REGION Civil Engineer mailing address

B Street, Lot 38

Bayamon PR 00961 US 787-749-7479 787-749-7401 jgomez-fragoso@usgs.gov FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata FGDC-STD-001.1-1999