Julieta Gomez-Fragoso Yanire Martinez-Martinez 20260330 spreadsheet https://doi.org/10.5066/P13YAAPN The input data package included in this data release contains a total of four (4) datasets. These datasets contain a list of the water quality constituents that were included in the trend analysis as well as historical data used to analyze trends in each of the water quality constituents for selected streams throughout Puerto Rico. This data release also includes the dataset that was not used for analysis during the preparation of data to ensure the data were adequate for the trend analysis. The water quality data was retrieved from the Water Quality Portal (www.waterqualitydata.us), and includes water-quality data for nutrients, physical parameters, major ions, metals, and streamflow data. The period of record for each site and each water quality constituent varies and includes data collected between water years 1958 and 2022. References Cited: National Water Quality Monitoring Council, Water Quality Portal (WQP), https://www.waterqualitydata.us/. Accessed 2023-10-19. The main purpose of these datasets is to provide the data used for trend analysis at selected surface water quality monitoring sites throughout Puerto Rico. These datasets were used to evaluate water-quality trends over the full length of record available for the site-parameter pair and three time periods: 2008-2022, 2013-2022, and 2017-2022. 1958 2022 publication date Complete None planned Puerto Rico -67.2600 -65.2533 18.5100 17.9212 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 Selenium Stream flow, instantaneous Dissolved oxygen Total nitrogen USGS Metadata Identifier USGS:6644d835d34e1955f5a429b8 Common geographic areas 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. Yanire Martinez U.S. Geological Survey, SOUTHEAST REGION Hydrologic Technician mailing address

B Street, Lot 38

Bayamon PR 00961 US 787-749-7451 787-749-7401 yamart@usgs.gov Water Quality Portal (www.waterqualitydata.us) Microsoft Windows 10 Enterprise and R version 2022.02.3 (Build 492) No formal attribute accuracy tests were conducted. Data were checked for duplication and expected ranges. This data set represents surface-water-quality data retrieved from the Water Quality Portal. 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. Used the open-source programming language R studio to retrieve the data from the Water Quality Portal and dataRetrieval package in R to pull data for the entire period of record through September 30, 2022 for the list of sites that is in water_quality_site_2022_list.xlsx and the list of constituents that is in parameters_list.xlsx. 20231019 Removed duplicates, records with zero values, and any record of discharge or temperature that was retrieved from Water Quality Portal but is not of interest to the study because it is not associated with water quality sampling. This step also included formatting the input files that were used for trend analysis. 20231030 Replaced censored data with the highest reporting level. Any data that was described as censored but had a measured value greater than the highest selected reporting level was left unchanged. 20231030 Removed any record that was not of interest to the study. To investigate what data were available for all the sites, a wide variety of water quality parameters was retrieved from the Water Quality Portal. All the parameters originally retrieved from the Water Quality Portal are in parameters_list.xlsx; however, only those parameters whose fate and transport behavior are likely to generate temporal trends were used in the trend analysis. The instantaneous streamflow data (USGSPCode 00061) were used for the flow adjustments. 20231030 water_quality_data_input.txt Format: comma delimited (.txt). Contains the input data used for trend analysis. Producer Defined OrganizationIdentifier Abbreviation for organization/agency and state. Water Quality Portal USGS-PR Concatenation of agency and state abbreviation. Agency: USGS (U.S. Geological Survey) State: PR (Puerto Rico). Producer defined MonitoringLocationIdentifier Individual location identifier from the Water Quality Portal retrieval. Identifies the agency and station number. Water Quality Portal Retrieved from Water Quality Portal. ActivityStartDate Date of sample collection from the Water Quality Portal retrieval. Water Quality Portal Date as MM/DD/YYYY. MM = month DD = day YYYY = year ActivityStartWaterYear Water year (October 1st of the previous year through September 30th of the stated year). Producer Defined 1958 2022 ActivityStartTime.Time Sampling time. Retrieved from the Water Quality Portal. Water Quality Portal NA There is no data available, or it is not applicable, if the ResultMeasureValue2 is associated with a statistically based value. Producer defined Time as hh:mm:ss. hh = hours mm = minutes ss = seconds ResultDetectionConditionText The textual descriptor of a result. Retrieved from Water Quality Portal. Water Quality Portal NA No Data Producer defined Not Detected Less than value in ResultMeasureValue Producer defined Detected Not Quantified Presence verified but not quantified in ResultMeasureValue Producer defined Present Above Quantification Limit More than value in ResultMeasureValue Producer defined CharacteristicName The object, property, or substance which is evaluated or enumerated by either a direct field measurement, a direct field observation, or by laboratory analysis of material collected in the field. Water Quality Portal Characteristic name from Water Quality Portal. ResultSampleFractionText The text name of the portion of the sample associated with results obtained from a physically-partitioned sample. U.S. Geological Survey NA No Data Producer defined Total Amount of a given constituent in a representative whole-water (unfiltered) sample, regardless of the constituent's physical or chemical form. Producer defined Dissolved Determinations of "dissolved" constituent concentrations are made on sample water that has been filtered. Producer defined Recoverable Amount of a given constituent in a whole-water sample after a sample has been digested. Producer defined ResultMeasureValue Reported concentration or other characteristic being analyzed, as reported in the Water Quality Portal, associated units given in ResultMeasure.MeasureUnitCode2. Water Quality Portal NA No Data Producer defined 0.001 12100 USGSPCode 5-digit parameter code used by the U.S. Geological Survey to identify the constituent measured and the units of measure. Set the data format as text to preserve leading zeros when importing to a spreadsheet editor. Water Quality Portal 00060 Discharge, cubic feet per second. Records with a time in ActivityStartTime.Time are discrete measurements performed during sampling. Records with an NA are daily mean values derived from continuous data, but can also include streamflow derived measured data, the rating curve method, or estimated values. U.S. Geological Survey 00061 Discharge, in cubic feet per second, refers to streamflow derived from measured data, the rating curve method, or estimated values. U.S. Geological Survey 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 U.S. Geological Survey 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 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 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 ResultMeasureValue2 Final reported concentration or value, associated units given associated units given in ResultMeasure.MeasureUnitCode2. Producer Defined NA No Data Producer defined 0.001 12100 ResultMeasure.MeasureUnitCode2 The code that represents the unit for measuring the item (ResultMeasureValue and ResultMeasureValue2). Producer Defined NA No Data Producer defined ft3/s cubic feet per second Producer defined uS/cm @25C microSiemens per centimeter, assumed to be at 25 degree Celsius Producer defined mg/l milligrams per liter Producer defined mg/l as N milligram per liter as nitrogen Producer defined mg/l as P milligram per liter as phosphorus Producer defined ug/l micrograms per liter Producer defined ng/l nanograms per liter Producer defined ResultDetectionConditionText2 The textual descriptor of a result (ResultMeasureValue2). Producer Defined NA No Data Producer defined < Less than value in ResultMeasureValue2 Producer defined M Presence verified but not quantified in ResultMeasureValue2 Producer defined > More than value in ResultMeasureValue2 Producer defined ActivityIdentifier Designator used in the Water Quality Portal to uniquely identifies an activity within an organization. Water Quality Portal Retrieved from Water Quality Portal. ActivityCommentText General comments concerning the activity from Water Quality Portal. Water Quality Portal NA No Data Producer defined Retrieved from Water Quality Portal. DetectionQuantitationLimitMeasure.MeasureValue The constituent concentration that, when processed through the complete method, produces a signal that is statistically different from a blank. Measure value is given in the units stored in DetectionQuantitationLimitMeasure/MeasureUnitCode2. Water Quality Portal NA No Data Producer defined 0.0005 4340 spID Unique site identifier; based on the U. S. Geological Survey station number and parameter name/code. Producer Defined Concatenation of MonitoringLocationIdentifier, Characteristic Name and USGSPCode. Each row of this dataset is an individual observed sample by site, parameter and date of collection. Month Calendar month sample was collected. Producer Defined 1 Corresponds to the month of January. Producer defined 2 Corresponds to the month of February. Producer defined 3 Corresponds to the month of March. Producer defined 4 Corresponds to the month of April Producer defined 5 Corresponds to the month of May. Producer defined 6 Corresponds to the month of June. Producer defined 7 Corresponds to the month of July. Producer defined 8 Corresponds to the month of August. Producer defined 9 Corresponds to the month of September Producer defined 10 Corresponds to the month of October. Producer defined 11 Corresponds to the month of November. Producer defined 12 Corresponds to the month of December Producer defined Year Calendar year sample was collected Producer Defined 1958 2022 decTime Calendar sample was collected in decimal year. Producer Defined 1958.197 2022.638 season Season identifier; based on the quarter when sample was collected. Producer Defined 1 Season 1 - data collected in November, December and January. Producer defined 2 Season 2 - data collected in February, March, and April. Producer defined 3 Season 3 - data collected in May, June and July. Producer defined 4 Season 4 - data collected in August, September and October. Producer defined ID_U Unique site identifier. Producer Defined Concatenation of MonitoringLocationIdentifier, ActivityIdentifier and USGSPCode. Each row of this dataset is an individual observed sample by site, parameter and date of collection. parameters_list.xlsx Excel Worksheet. List of parameters that were retrieved from the Water Quality Portal. This file contains all the parameters originally retrieved from the Water Quality Portal, however, only those parameters whose fate and transport behavior are likely to generate temporal trends were used in the trend analysis. Producer Defined Parameter_code 5-digit parameter code used by the U.S. Geological Survey to identify the constituent measured and the units of measure. U.S. Geological Survey 5-digit parameter code Constituent code used by the U.S. Geological Survey to identify the constituent measured and the units of measure. See Remark column label for further description. U.S. Geological Survey Parameter_name Constituent name used in data analysis. Producer Defined Field containing a combination of a short name for the constituent and the USGSPCode. Remark Supplemental information for parameter code. Producer Defined Contains constituent code, constituent name, information about the sample-type and units of the constituent. CharacteristicName Describes the object, property, or substance which is evaluated or enumerated by either a direct field measurement, a direct field observation, or by laboratory analysis of material collected in the field. U.S. Geological Survey Reference: Water Quality Portal water_quality_site_2022_list.xlsx Excel Worksheet. Contains information about the surface water monitoring sites for which the trend analyses were conducted. Producer Defined STAID Eight-digit number for a station, used by the U.S. Geological Survey to distinguish a site. Producer Defined Eight-digit number for a station Number for a station, used by the U.S. Geological Survey to distinguish a site. See SNAME column label for further information. Producer defined SNAME Station name of the water-quality site. Producer Defined Reference: USGS National Water Information System (NWIS) Lat Streamgage latitude, in decimal degrees (negative sign indicates the site is west of the central meridian) Producer Defined 17.99706627 18.4732773 Long Streamgage longitude, in decimal degrees (negative sign indicates the site is west of the central meridian) Producer Defined -67.16073624 -65.64599483 H_U U.S. Geological Survey hydrologic unit code (10-digit), watershed accounting systems used by the USGS to delineate watersheds. Producer Defined 2101000201 U.S. Geological Survey hydrologic unit code (10-digit) for Rio Cibuco Watershed. U.S. Geological Survey 2101000202 U.S. Geological Survey hydrologic unit code (10-digit) for Rio Grande de Manati Watershed. U.S. Geological Survey 2101000204 U.S. Geological Survey hydrologic unit code (10-digit) for Rio Grande de Arecibo Watershed. U.S. Geological Survey 2101000205 U.S. Geological Survey hydrologic unit code (10-digit) for Quebrada Los Cedros to Rio Camuy Watershed. U.S. Geological Survey 2101000301 U.S. Geological Survey hydrologic unit code (10-digit) for Rio Culebrinas Watershed. U.S. Geological Survey 2101000302 U.S. Geological Survey hydrologic unit code (10-digit) for Rio Grande de Añasco Watershed. U.S. Geological Survey 2101000303 U.S. Geological Survey hydrologic unit code (10-digit) for Rio Yaguez Watershed. U.S. Geological Survey 2101000304 U.S. Geological Survey hydrologic unit code (10-digit) for Rio Guanajibo Watershed. U.S. Geological Survey 2101000402 U.S. Geological Survey hydrologic unit code (10-digit) for Rio Yauco to Rio Tallaboa Watershed. U.S. Geological Survey 2101000403 U.S. Geological Survey hydrologic unit code (10-digit) for Rio Matilde to Rio Descalabrado Watershed. U.S. Geological Survey 2101000404 U.S. Geological Survey hydrologic unit code (10-digit) for Rio Coamo to Rio Seco Watershed. U.S. Geological Survey 2101000405 U.S. Geological Survey hydrologic unit code (10-digit) for Rio Guamani to Rio Jacaboa Watershed. U.S. Geological Survey 2101000501 U.S. Geological Survey hydrologic unit code (10-digit) for Rio Maunabo to Rio Humacao Watershed. U.S. Geological Survey 2101000502 U.S. Geological Survey hydrologic unit code (10-digit) for Rio Anton Ruiz to Rio Fajardo Watershed. U.S. Geological Survey 2101000503 U.S. Geological Survey hydrologic unit code (10-digit) for Rio Herrera to Las Cabezas de San Juan Coastal Watershed. U.S. Geological Survey 2101000504 U.S. Geological Survey hydrologic unit code (10-digit) for Rio Grande de Loiza Watershed. U.S. Geological Survey 2101000505 U.S. Geological Survey hydrologic unit code (10-digit) for San Juan Bay Estuary Watershed. U.S. Geological Survey 2101000506 U.S. Geological Survey hydrologic unit code (10-digit) for Rio de Bayamon to Rio Hondo Watershed. U.S. Geological Survey 2101000507 U.S. Geological Survey hydrologic unit code (10-digit) for Rio de la Plata Watershed. U.S. Geological Survey data_not_used.txt Format: Tab separated .txt file containing data that was removed from the dataset during checks for suitability for trend analysis. Producer Defined OrganizationIdentifier Abbreviation for organization/agency and state. Producer defined USGS-PR Concatenation of agency and state abbreviation. Agency: USGS (U.S. Geological Survey) State: PR (Puerto Rico). Producer defined MonitoringLocationIdentifier Individual location identifier from the Water Quality Portal retrieval. Identifies the agency and station number. Water Quality Portal Retrieved from Water Quality Portal. ActivityStartDate Date of sample collection from the Water Quality Portal retrieval. Water Quality Portal Date as MM/DD/YYYY MM - month (i.e. 1 - January) DD - day YYYY - Year ActivityStartWaterYear Water year (October 1st of the previous year through September 30th of the stated year). Producer Defined 1958 2021 ActivityStartTime.Time Sampling time. Retrieved from the Water Quality Portal. Water Quality Portal NA No Data Producer defined Time as hh:mm:ss. ResultDetectionConditionText The textual descriptor of a result. Retrieved from Water Quality Portal. Water Quality Portal NA No Data Producer defined Not Detected Less than value in ResultMeasureValue Producer defined Detected Not Quantified Presence verified but not quantified in ResultMeasureValue Producer defined CharacteristicName Describes the object, property, or substance which is evaluated or enumerated by either a direct field measurement, a direct field observation, or by laboratory analysis of material collected in the field. Water Quality Portal Characteristic name from Water Quality Portal. ResultSampleFractionText The text name of the portion of the sample associated with results obtained from a physically-partitioned sample. Water Quality Portal NA No Data Producer defined Total Amount of a given constituent in a representative whole-water (unfiltered) sample, regardless of the constituent's physical or chemical form. Producer defined Dissolved Determinations of "dissolved" constituent concentrations are made on sample water that has been filtered. Producer defined Recoverable Amount of a given constituent in a whole-water sample after a sample has been digested by a method Producer defined ResultMeasureValue Reported concentration or other characteristic being analyzed, as reported in the Water Quality Portal, associated units given in ResultMeasure.MeasureUnitCode2. Water Quality Portal NA No Data Producer defined 0.003 112000 USGSPCode 5-digit parameter code used by the U.S. Geological Survey to identify the constituent measured and the units of measure. Set the data format as text to preserve leading zeros when importing to a spreadsheet editor. Water Quality Portal 5-digit parameter code Constituent code used by the U.S. Geological Survey to identify the constituent measured and the units of measure. See CharacteristicName column label for further description. Producer defined ResultMeasureValue2 Final reported concentration or value, associated units given associated units given in ResultMeasure.MeasureUnitCode2 Producer Defined 0.003 112000 ResultMeasure.MeasureUnitCode2 The code that represents the unit for measuring the item (ResultMeasureValue and ResultMeasureValue2). Producer Defined mg/l milligrams per liter Producer defined ft3/s cubic feet per second Producer defined deg C degrees Celsius Producer defined std units standard units Producer defined uS/cm @25C microSiemens per centimeter, 25 degree Celsius Producer defined NTU Nephelometric Turbidity Units Anderson, C.W., 2005, Turbidity: U.S. Geological Survey Techniques of Water-Resources Investigations, book 9, chap. A6.7, https://doi.org/10.3133/twri09A6.7. mg/l as N milligram per liter as nitrogen Producer defined mg/l as P milligram per liter as phosphorus Producer defined ug/l micrograms per liter Producer defined ng/l nanograms per liter Producer defined ResultDetectionConditionText2 The textual descriptor of a result (ResultMeasureValue2). Producer Defined NA No Data Producer defined < less than value in ResultMeasureValue2 Producer defined M presence verified but not quantified in ResultMeasureValue2 Producer defined ActivityIdentifier Designator used in the Water Quality Portal to uniquely identify an activity within an organization. Water Quality Portal Retrieved from Water Quality Portal. DetectionQuantitationLimitMeasure.MeasureValue The constituent concentration that, when processed through the complete method, produces a signal that is statistically different from a blank. Measure value is given in the units stored in DetectionQuantitationLimitMeasure/MeasureUnitCode2. Water Quality Portal NA No Data Producer defined 0.001 100 ActivityCommentText General comments concerning the activity from Water Quality Portal. Water Quality Portal NA No Data Producer defined Retrieved from Water Quality Portal. spID Unique site identifier; based on the USGS station number and parameter name/code. Water Quality Portal Concatenation of MonitoringLocationIdentifier, Characteristic Name and USGSPCode. Each row of this dataset is an individual observed sample by site, parameter and date of collection. Month Calendar month sample was collected. Producer Defined 1 Corresponds to the month of January. Producer defined 2 Corresponds to the month of February. Producer defined 3 Corresponds to the month of March. Producer defined 4 Corresponds to the month of April Producer defined 5 Corresponds to the month of May. Producer defined 6 Corresponds to the month of June. Producer defined 7 Corresponds to the month of July. Producer defined 8 Corresponds to the month of August. Producer defined 9 Corresponds to the month of September Producer defined 10 Corresponds to the month of October. Producer defined 11 Corresponds to the month of November. Producer defined 12 Corresponds to the month of December Producer defined Year Calendar year sample was collected. Producer Defined 1958 2021 decTime Calendar date sample was collected in decimal year. Producer Defined 1958.2438359999999 2021.876712 season Season identifier; based on the quarter when sample was collected. Producer Defined 1 Season 1 - data collected in November, December January. Producer defined 2 Season 2 - data collected in February, March, and April. Producer defined 3 Season 3 - data collected in May, June and July. Producer defined 4 Season 4 - data collected in August, September and October. Producer defined Remark General remarks regarding the reasoning for excluding this site-constituent record from the input file. Producer Defined General comments on the removal of duplicates, records with zero values, and any discharge or temperature records obtained from the Water Quality Portal that are irrelevant to the study due to their lack of association with water quality sampling. 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