Samuel A. Miller Larry B. Barber Kaycee E. Faunce Stephanie E. Gordon Brianna M. Williams 20250418 tabular digital data Reston, Virginia U.S. Geological Survey https://doi.org/10.5066/P134KYMX Samuel A. Miller Kaycee E. Faunce Larry B. Barber Jacob A. Fleck Daniel W. Burns Jeramy R. Jasmann Michelle L. Hladik 202412 publication Science of The Total Environment vol. 954 n/a Elsevier BV ppg. 174939 https://doi.org/10.1016/j.scitotenv.2024.174939 This data release contains measured streamflow data from U.S. Geological Survey (USGS) streamgages and reported wastewater data from wastewater treatment plants (WWTP) discharge monitoring reports (DMRs) within the Potomac River watershed between October 1, 2021 and September 30, 2024. Mean monthly streamflow data was obtained from 117 USGS streamgages (Table1_Streamgages.csv). Average monthly reported wastewater discharge volumes to surface water were obtained from National Pollutant Discharge Elimination System (NPDES) permits using the United States Environmental Protection Agency’s (USEPA) Environment and Compliance History Online (ECHO) database to obtain DMRs from the Integrated Compliance Information System National Pollutant Discharge Elimination System (ICIS-NPDES). Quality assurance procedures that were used to avoid inclusion of inaccurate data that can be reported on DMRs (Table2_WWTP_DMRs.csv) are documented within the Process Step fields of the metadata. At each streamgage the average monthly accumulated wastewater percentage (ACCWW) was calculated by dividing the total amount of reported wastewater upstream of the streamgage by the measured amount of streamflow (Table3_Streamgage_ACCWW.csv) following similar methods described in Miller and others (2024) and Barber and others (2025). The ACCWW calculations were computed monthly at each streamgage using reported total wastewater discharge, municipal wastewater discharge, and municipal-plus-industrial per- and polyfluoroalkyl substances (PFAS) wastewater discharge which includes municipal wastewater in addition to wastewater from industrial WWTPs that are potential PFAS handling industry sectors defined by the USEPA (2023). The term ‘municipal’ is used here to represent NPDES-permitted facilities with the Standard Industrial Classification code 4952 (‘sewerage systems’) and 'industrial' refers to permitted facilities with Standard Industrial Classification codes other than 4952. Monthly predicted environmental concentrations and constituent loads (i.e. mass fluxes) of eight PFAS and 14 pesticides were estimated at each streamgage following methodology presented by Barber and others (2025) and Miller and others (2024). Monthly PFAS loads were computed by multiplying the discharge volumes from municipal and industrial WWTPs that are potential PFAS handling industry sectors by the median PFAS concentrations measured and reported in Barber and others (2025). Monthly pesticide loads were computed by multiplying the discharge volumes from municipal WWTPs by the median pesticide concentrations reported in Miller and others (2024). Wastewater effluent concentrations from Miller and others (2024) and Barber and others (2025) are provided in Table4_Parameters.csv. Monthly predicted constituent loads from wastewater were summed from WWTPs that discharged to every National Hydrography Dataset Version 2.1 (NHDPlus V2; USEPA, 2012) stream segment Common Identifier (COMID) upstream of each streamgage, not including the COMID where the streamgage was located, to calculate the predicted monthly load at each streamgage (Table5_Streamgage_Parameter_Predictions.csv). Predicted monthly concentrations from wastewater were calculated by dividing the predicted monthly load by measured monthly streamflow at each streamgage (Table5_Streamgage_Parameter_Predictions.csv). These data were used to support the development of an interactive, online accumulated wastewater dashboard for the Potomac River watershed where users can visualize reported wastewater discharges volumes relative to measured streamflow conditions and view predicted PFAS and pesticide concentration and load at streamgages based on the amount of accumulated wastewater reported from wastewater treatment plants. 20211001 20240930 ground condition Complete None planned -79.6996 -76.2368 40.2385 37.8604 ISO 19115 Topic Category environment USGS Thesaurus water quality wastewater discharge streamflow PFAS USGS Metadata Identifier USGS:67911220d34ea6a4002bf7f9 place Potomac River Virginia West Virginia Maryland Pennsylvania Washington, D.C. Chesapeake Bay Watershed 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. Samuel A Miller USGS - Northeast Region Hydrologist mailing and physical

1730 East Parham Road

Richmond VA 23228 +18044049094x140 smiller@usgs.gov This effort was supported by the U.S. Geological Survey Water Mission Area Proxies Project and the U.S. Geological Survey Ecosystem Mission Area Environmental Health Program (Toxic Substances Hydrology). Samuel A. Miller Kaycee E. Faunce Larry B. Barber Jacob A. Fleck Daniel W. Burns Jeramy R. Jasmann Michelle L. Hladik 202412 publication Science of The Total Environment vol. 954 n/a Elsevier BV ppg. 174939 https://doi.org/10.1016/j.scitotenv.2024.174939 Larry B. Barber Samuel A. Miller Lee Blaney Paul M. Bradley Kaycee E. Faunce Jacob A. Fleck Malinda Frick Ke He Ryan D. Hollins Conor J. Lewellyn Emily H. Majcher Mitchell A. McAdoo Kelly L. Smalling 20250301 publication Environmental Science & Technology 2025 https://pubs.acs.org/doi/10.1021/acs.est.4c12167 All input streamflow and wastewater discharge values were downloaded from the online databases on February 7, 2025. Quality assurance procedures are documented in the process step that describe steps that were used to avoid inclusion of inaccurate data that can be reported on DMRs. Attribute values were checked for data duplication and omission. Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. No formal positional accuracy tests were conducted. No formal positional accuracy tests were conducted. Samuel A. Miller Kaycee E. Faunce Larry B. Barber Jacob A. Fleck Daniel W. Burns Jeramy R. Jasmann Michelle L. Hladik 202412 publication Science of The Total Environment vol. 954 n/a Elsevier BV ppg. 174939 https://doi.org/10.1016/j.scitotenv.2024.174939 Digital and/or Hardcopy 20241201 ground condition Miller and others, 2024 Parameter concentrations from published wastewater effluent (Table4_Parameters.csv) used to predict monthly loads and concentrations. Larry B. Barber Samuel A. Miller Lee Blaney Paul M. Bradley Kaycee E. Faunce Jacob A. Fleck Malinda Frick Ke He Ryan D. Hollins Conor J. Lewellyn Emily H. Majcher Mitchell A. McAdoo Kelly L. Smalling 20250501 publication Environmental Science & Technology 2025 https://pubs.acs.org/doi/10.1021/acs.est.4c12167 Digital and/or Hardcopy 20250501 ground condition Barber and others, 2025 Parameter concentrations from published wastewater effluent (Table4_Parameters.csv) used to predict monthly loads and concentrations. Laura A DeCicco Robert M Hirsch David Lorenz David Watkins Michael Johnson 20241031 application/service https://www.sciencebase.gov U.S. Geological Survey https://doi.org/10.5066/p9x4l3ge Digital and/or Hardcopy 20211001 20240930 ground condition DeCicco and others, 2024 This R software package was used to identify NPDES permitted features and USGS streamgages within the Potomac River watershed. Streamflow data was downloaded from the USGS NWIS using this package. Michael Schramm 20230622 application/service https://mps9506.github.io/echor/ Digital and/or Hardcopy 20211001 20240930 ground condition Schramm, 2022 This R software package was used to download NPDES facility information and flow values from DMRs from permitted features within the Potomac River watershed that were used in Table2_WWTP_DMRs.csv to calculate accumulated wastewater percentage in Table3_Streamgage_ACCWW.csv and predict loads and concentrations of parameters in Table5_Streamgage_Parameter_Predictions.csv. U.S. Environmental Protection Agency 20230401 tabular digital data https://echo.epa.gov/system/files/PFASHandlingIndustrySectors-Apr2023-Pub.xlsx Digital and/or Hardcopy 20230401 ground condition PFAS Handling Industry Sectors Standard Industrial Classification codes for industrial wastewater treatment plants that are potential PFAS handling sectors used to categorize facilities in Table2_WWTP_DMRs.csv and used in the predicted monthly PFAS loads and concentrations in Table5_Streamgage_Parameter_Predictions.csv. U.S. Environmental Protection Agency 2012 application/service https://www.epa.gov/waterdata/get-nhdplus-national-hydrography-dataset-plus-data Digital and/or Hardcopy 2012 ground condition NHDPlus V2.1 Stream segment common identifiers (column name: comid) listed in Table1_Streamgages and Table2_WWTP_DMRs. U.S. Environmental Protection Agency 2025 application/service https://echo.epa.gov/ Digital and/or Hardcopy 2025 ground condition USEPA ICIS-NPDES USEPA database that stores the NPDES facility information and flow values from DMRs from permitted features within the Potomac River watershed that were used in Table2_WWTP_DMRs.csv to calculate accumulated wastewater percentage in Table3_Streamgage_ACCWW.csv and predict loads and concentrations of parameters in Table5_Streamgage_Parameter_Predictions.csv. USGS streamgages within the Potomac River watershed with mean daily streamflow data between October 1, 2021 and September 30, 2024 were downloaded using the R package ‘dataRetrieval’ (DeCicco and others, 2024) on February 7, 2025 (Table1_Streamgages.csv). Streamgages with at least 90% of a complete record during this period were retained. All permitted USEPA NPDES features within the Potomac River watershed (upstream of NHDPlusV2 COMID 4539621) were identified using the function findNLDI from version 2.7.17 of the R package ‘dataRetrieval’ (DeCicco and others, 2024) on February 7, 2025. DeCicco and others, 2024 20250207 Facility information for all ICIS-NPDES facilities within the Potomac River watershed (4-character watershed code ‘0207’) were obtained using version 0.1.9 of the R package ‘echor’ (Schramm, 2022) on February 7, 2025. Discharge monitoring reports (DMRs) were downloaded from each nine-character code NPDES facility identified within the Potomac River watershed between October 1, 2021 and September 30, 2024 using ‘echor’ (Schramm, 2022) on February 7, 2025 which obtains data from the USEPA ICIS-NPDES (2025). Schramm, 2022 20250207 Values from DMRs were filtered to only include permitted features (i.e. outfalls) described as an ‘External Outfall’ as the permit feature type with a monitoring location description related to ‘effluent’. Retained DMRs were limited to parameters relating to the term ‘flow’ which primarily were ‘Flow, in conduit or thru treatment plant’ (parameter code 50050), but also included ‘Flow rate’ (parameter codes 00056, 00058, 74060), ‘Flow, discharge’ (parameter code 51788), ‘Flow, total’ (parameter code 82220), and ‘Streamflow’ (parameter code 00060). Only average monthly values were retained which primarily consisted of ‘Monthly Average’ values, but also included a smaller number of values described as ‘Average’, ‘30 Day Average’, ‘Mean’, and ‘Monthly Median’. Only flow DMRs in the standard unit of million gallons per day (MGD) were retained and DMRs without a value expressed in standard units, as calculated by ICIS-NPDES were excluded. Following these filtering steps, additional quality assurance checks were conducted to ensure accurate data were retained to prevent unrealistically high ACCWW calculations. These steps applied to less than 2% of the flow values. 1. Flow values from permitted features with repeated, identical values from the same monitoring period were excluded. 2. If the monthly average flow value was greater than the reported ‘Daily Maximum’ or ‘Maximum’ for a monitoring period, the maximum value was used instead of the monthly average value. 3. Statistical Z-scores were calculated for each flow value relative to the other months for each permitted feature. If the z-score was greater than 4 and the flow value was greater than 10 MGD, the flow value was excluded. 4. The standard flow unit, MGD, was sometimes incorrectly reported from a small number of DMRs. This resulted in approximately 1,000,000 times higher than expected flow values. Flow values exceeding 1,000 MGD (except from NPDES permit MD0002674) were divided by 1,000,000. 5. Flow values exceeding 10 MGD from general NPDES permits (‘G’ in the third character) were excluded. 6. Flow values from two NPDES permits exceeding 100 MGD were excluded (MD3336K05 and VA0090590). 7. Reported flow values equal to zero were excluded. 20250207 Each permitted feature was then assigned to a COMID. Most of the permitted features had COMIDs assigned from the Network Linked Data Index (NLDI) which utilizes the USEPA Reach Address Database to link Reach Codes to COMIDs. Two steps were used to identify COMIDs from permitted features that were not identified from the NLDI. 1. If a permitted feature was from a NPDES facility that had a different permitted feature assigned to a COMID, the most common occurring assigned-COMID from that facility was assigned to the permitted feature with the missing COMID. 2. If a permitted feature did not have other features from a NPDES facility previously assigned to a COMID, the facility coordinates were used to find the closest COMID using the ‘findNLDI’ function of ‘dataRetrieval’ (DeCicco and others, 2024). Some facility coordinates were outside of the Potomac River watershed, therefore only permitted features within the Potomac River watershed were retained. 3. If a facility's location was greater than 50 miles from an outfall of that facility, the data were excluded. DeCicco and others, 2024 20250207 A data frame was created that contained: (1) the filtered average monthly flow DMR data converted to cubic feet per second; (2) the month of the reporting period converted to the first day of the month; (3) the assigned COMID for each permitted feature; and (4) relevant facility information including the facility name, NPDES permit number, standard industrial classification (SIC) codes and North American Industry Classification System (NAICS) codes (Table2_WWTP_DMRs.csv). Average monthly flow data were rounded to the greatest precision supplied from the input data from ICIS-NPDES. Some facilities reported multiple SIC codes. Any facility that reported SIC code ‘4952’ (‘sewerage systems’) was considered a ‘municipal’ WWTP regardless of the order of the assigned SIC codes. If any facility had SIC codes that matched the potential PFAS handling sectors defined by USEPA (2022), but did not contain SIC code ‘4952’, they were considered ‘industrial PFAS’ WWTPs. All remaining facilities were classified as ‘industrial’ WWTPs. Sewerage SIC codes were excluded from two facilities that appear to be more related to the other listed SIC codes (MD0055182 and MD0064149). For each USGS streamgage, the NHDPlus V2 stream network was identified with the function ‘findNLDI’ from the R package ‘dataRetrieval’ (DeCicco and others, 2024). Only streamgages with an identified COMID were retained. For each streamgage, the flow DMRs with COMIDs that matched the corresponding stream network, excluding the COMID identified at the watershed outlet, were filtered to calculate the total amount of average monthly wastewater reported. Three permitted features from an ‘Electric Services’ facility that discharge into a large reservoir were excluded from these calculations (WV0005525101, WV0005525201, and WV0005525301) since the corresponding facility withdraws large volumes from the reservoir, therefore impacting ACCWW calculations. Average monthly ACCWW was summarized by total wastewater, municipal-plus-industrial PFAS wastewater, and municipal-only wastewater. The monthly percentage of streamflow comprised from these three categories was calculated by dividing the ACCWW volumes by the average monthly measured streamflow at each streamgage (Table3_Streamgage_ACCWW.csv). DeCicco and others, 2024 20250207 Monthly PFAS and pesticide loads were predicted by multiplying the accumulated wastewater by published median wastewater effluent concentrations of eight PFAS (Barber and others, 2025) and 14 pesticides (Miller and others, 2024; Table4_Parameters.csv) and rounded to three digits. For PFAS loads, the accumulated volume of municipal plus industrial PFAS wastewater were used. For pesticide loads, the accumulated volume of municipal-only wastewater was used. Average monthly PFAS and pesticide concentrations were predicted by dividing the predicted monthly constituent loads by the average measured monthly streamflow at each streamgage around rounded to three digits (Table5_Streamgage_Parameter_Predictions.csv). Barber and others, 2025 Miller and others, 2024 20250207 Table1_Streamgages.csv Comma Separated Value (CSV) file containing data. Producer Defined site_no A unique 8- to 10-digit U.S. Geological Survey station identification number assigned to each sampling site, with the prefix "USGS-". https://waterdata.usgs.gov/nwis Unique strings that are automatically generated site_comid National Hydrograph Dataset Plus version 2.1 (NHDPlus v2.1) common identifier for the streamgage location. https://www.epa.gov/system/files/documents/2023-04/NHDPlusV2_User_Guide.pdf Unique strings that are automatically generated station_nm The official U.S. Geological Survey station name for the sampling site. https://waterdata.usgs.gov/nwis Unique name describing sampling location drainage_area_mi2 Watershed drainage area for the streamgage in square miles. https://waterdata.usgs.gov/nwis NA No Data Producer defined 0.37 11560.0 latitude Latitude, in decimal degrees. Datum: NAD83. https://waterdata.usgs.gov/nwis 38.0576362 39.89842119 decimal degrees longitude Longitude, in decimal degrees. Datum: NAD83. https://waterdata.usgs.gov/nwis -79.3378199 -76.5036667 decimal degrees accumulated_wastewater Conditional column whether or not a streamgage had upstream wastewater with reported discharge Producer Defined yes The streamgage had upstream wastewater with a reported discharge value Producer defined no The streamgage did not have upstream wastewater with a reported discharge value Producer defined Table2_WWTP_DMRs.csv Comma Separated Value (CSV) file containing data. Producer Defined name Company or permit holder name, as maintained in ICIS-NPDES. The facility name may differ across EPA databases due to differences in reported information, change in ownership, use of parent or subsidiary name, etc. https://echo.epa.gov/facilities/facility-search Unique name describing facility npdes A unique 9-character ID assigned for each permit within the National Pollutant Discharge Elimination System (NPDES) program. These identifiers are for used tracking purposes in the individual data systems. The ID may contain both letters and numbers and often begins with the two-letter abbreviation for the state in which the facility is permitted. https://echo.epa.gov/facilities/facility-search Unique strings that are automatically generated perm_feature_nmbr The permitted feature (i.e. outfall) identifier assigned for each location at which permit conditions are being applied. https://echo.epa.gov/facilities/facility-search Unique strings that are automatically generated comid National Hydrograph Dataset Plus version 2.1 (NHDPlus v2.1) common identifier for the permitted feature location. https://www.epa.gov/system/files/documents/2023-04/NHDPlusV2_User_Guide.pdf Unique strings that are automatically generated sic Indicates the facility’s or permit's primary Standard Industrial Classification (SIC) Code. The SIC code describes the primary activity of the facility. The first two digits in the code define a major business sector; the last two digits denote a facility's specialty within the major sector. https://www.osha.gov/data/sic-search NA No Data https://echo.epa.gov/facilities/facility-search Standard Industrial Classification code for each facility. Multiple codes are separated by spaces. naics Indicates the facility’s or permit's primary North American Industry Classification System (NAICS) Code. The NAICS Code has replaced the U.S. Standard Industrial Classification (SIC) system. The system was developed to give special attention to developing production-oriented classifications for (a) new and emerging industries, (b) service industries in general, and (c) industries engaged in the production of advanced technologies. NAICS industries are identified by a 6-digit code. The first two digits represent the industry sector, in which there exist 20 broad sectors. The third digit represents industry subsector, the fourth digit represents industry group, the fifth digit represents industry, and the sixth digit is U.S., Canadian, or Mexican National specific. https://www.census.gov/naics/ NA No Data https://echo.epa.gov/facilities/facility-search North American Industry Classification System code for each facility. Multiple codes are separated by spaces. month The first date of the month for the monitoring period. Producer Defined 10/1/2021 9/1/2024 m/d/yyyy discharge_cfs The quality-assured flow value expressed in cubic feet per second. Producer Defined 1.547234e-08 1593.65102 Cubic feet per second dmr_value_standard_units_mgd The reported flow value expressed in million gallons per day. https://echo.epa.gov/facilities/facility-search 1e-08 849258.0 Million gallons per day discharge_type A categorical value describing whether the permitted feature was identified as a municipal, industrial PFAS, or industrial discharge based on the facility's SIC code. Producer Defined industrial The permitted feature was considered an industrial source. Producer defined industrial_PFAS The permitted feature was considered an industrial PFAS source. U.S. Environmental Protection Agency (2023) municipal The permitted feature was considered a municipal source. Producer defined Table3_Streamgage_ACCWW.csv Comma Separated Value (CSV) file containing data. Producer Defined site_no A unique 8- to 10-digit U.S. Geological Survey station identification number assigned to each sampling site, with the prefix "USGS-". https://waterdata.usgs.gov/nwis Unique strings that are automatically generated station_nm The official U.S. Geological Survey station name for the sampling site. https://waterdata.usgs.gov/nwis Unique name describing sampling location month The first date of the month for the streamflow aggregation period. Producer Defined 10/1/2021 9/1/2024 m/d/yyyy streamflow_cfs Average monthly streamflow in cubic feet per second. Producer Defined 0.17 24382.33 Cubic feet per second accumulated_wastewater_cfs Average monthly accumulated wastewater from all upstream permitted features in cubic feet per second. Producer Defined NA No Data Producer defined 2e-08 1907.25670065 Cubic feet per second accumulated_municipal_wastewater_cfs Average monthly accumulated wastewater from permitted features categorized as municipal facilities in cubic feet per second. Producer Defined NA No Data Producer defined 0.00030945 286.40151808 Cubic feet per second accumulated_PFAS_wastewater_cfs accumulated wastewater from permitted features categorized as municipal or industrial PFAS facilities in cubic feet per second. Producer Defined NA No Data Producer defined 0.00030945 1605.14936889 Cubic feet per second Table4_Parameters.csv Comma Separated Value (CSV) file containing data. Producer Defined Parameter Abbreviated text to describe the water-quality parameters used for accumulated wastewater concentration and load predictions. Producer Defined PFBA The PFAS Perfluorobutanoate Producer defined PFPeA The PFAS Perfluoropentanoate Producer defined PFHxA The PFAS Perfluorohexanoate Producer defined PFHpA The PFAS Perfluoroheptanoate Producer defined PFOA The PFAS Perfluorooctanoate Producer defined PFBS The PFAS Perfluorobutane sulfonate Producer defined PFHxS The PFAS Perfluorohexane sulfonate Producer defined PFOS The PFAS Perfluorooctane sulfonate Producer defined Azoxystrobin The pesticide azoxystrobin Producer defined Carbendazim The pesticide carbendazim Producer defined Propiconazole The pesticide propiconazole Producer defined Tebuconazole The pesticide tebuconazole Producer defined Thiabendazole The pesticide thiabendazole Producer defined Atrazine The pesticide atrazine Producer defined Diuron The pesticide diuron Producer defined Metolachlor The pesticide metolachlor Producer defined Prometon The pesticide prometon Producer defined Simazine The pesticide simazine Producer defined Clothianidin The pesticide clothianidin Producer defined Dinotefuran The pesticide dinotefuran Producer defined Fipronil The pesticide fipronil Producer defined Imidacloprid The pesticide imidacloprid Producer defined CAS Chemical Abstract Registry Number for water-quality parameter, a registered trademark of the American Chemical Society, as assigned to the listed water-quality parameter in the U.S. Geological Survey National Water Information System. https://www.cas.org/ Unique text strings consisting of integers separated by "-" Concentration_ngL_5th The fifth percentile of wastewater effluent concentration for the water-quality parameter in nanograms per liter. Producer Defined 0.011 8.15 Nanograms per liter Percentile_ngL_50th The median (i.e. 50th percentile) of wastewater effluent concentration for the water-quality parameter in nanograms per liter. Producer Defined 0.767 22.753 Nanograms per liter Percentile_ngL_95th The ninety-fifth percentile of wastewater effluent concentration for the water-quality parameter in nanograms per liter. Producer Defined 4.656 315.586 Nanograms per liter Table5_Streamgage_Parameter_Predictions.csv Comma Separated Value (CSV) file containing data. Producer Defined site_no A unique 8- to 10-digit U.S. Geological Survey station identification number assigned to each sampling site, with the prefix "USGS-". https://waterdata.usgs.gov/nwis Unique strings that are automatically generated station_nm The official U.S. Geological Survey station name for the sampling site. https://waterdata.usgs.gov/nwis Unique name describing sampling location month The first date of the month for the load and concentration predictions. Producer Defined 10/1/2021 9/1/2024 m/d/yyyy streamflow_L Total monthly streamflow, in liters. Producer Defined 58424128 1789593669734 Liters parameter Abbreviated text to describe the water-quality parameters used for accumulated wastewater concentration and load predictions. Producer Defined PFBA The PFAS Perfluorobutanoate Producer defined PFBS The PFAS Perfluorobutane sulfonate Producer defined PFPeA The PFAS Perfluoropentanoate Producer defined PFHxA The PFAS Perfluorohexanoate Producer defined PFHxS The PFAS Perfluorohexane sulfonate Producer defined PFHpA The PFAS Perfluoroheptanoate Producer defined PFOA The PFAS Perfluorooctanoate Producer defined PFOS The PFAS Perfluorooctane sulfonate Producer defined ΣPFAS The sum of PFBA, PFPeA, PFHxA, PFHpA, PFOA, PFBS, PFHxS, and PFOS Producer defined Azoxystrobin The pesticide azoxystrobin Producer defined Carbendazim The pesticide carbendazim Producer defined Propiconazole The pesticide propiconazole Producer defined Tebuconazole The pesticide tebuconazole Producer defined Thiabendazole The pesticide thiabendazole Producer defined Atrazine The pesticide atrazine Producer defined Diuron The pesticide diuron Producer defined Metolachlor The pesticide metolachlor Producer defined Prometon The pesticide prometon Producer defined Simazine The pesticide simazine Producer defined Clothianidin The pesticide clothianidin Producer defined Dinotefuran The pesticide dinotefuran Producer defined Fipronil The pesticide fipronil Producer defined Imidacloprid The pesticide imidacloprid Producer defined ΣPesticide The sum of azoxystrobin, carbendazim, propiconazole, tebuconazole, thiabendazole, atrazine, diuron, metolachlor, prometon, simazine, clothianidin, dinotefuran, fipronil, and imidacloprid Producer defined predicted_load_g The monthly predicted load of the parameter in grams. Producer Defined 0.000 7489.711 Grams predicted_concentration_ngL The monthly predicted average concentration of the parameter in nanograms per liter. Producer Defined 0.000 84.433 Nanograms per liter U.S. Geological Survey - ScienceBase mailing address

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 for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/P134KYMX None 20250605 Samuel A Miller USGS - Northeast Region Hydrologist mailing and physical

1730 East Parham Road

Richmond VA 23228 +18044049094x140 smiller@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998