This U.S. Geological Survey data release provides surface-water quality, streamflow, and groundwater-elevation data collected within the Central Pine Barrens (CPB) Region of Suffolk County, New York. The data were collected in cooperation with the Central Pine Barrens Commission and the Town of Brookhaven as part of a five-year comprehensive water-resources monitoring program. Water quality and quality-assurance data from seven sites on two rivers (Carmans River- 5 sites and Peconic River - 2 sites) in the CPB are included. Carmans River sites were sampled four times throughout the year (fall, winter, spring, and summer) and Peconic River sites were sampled twice throughout the year (fall and spring). Water-quality field parameters measured during each site visit are included. All samples were analyzed for nutrients, major inorganics, and alkalinity. An annual set of organic samples for pesticide and pharmaceutical analysis were collected at one Carmans River site and two Peconic River sites. Periodic groundwater-elevation data collected from six CPB wells are included. Continuous (15-mimute interval) groundwater-elevation data is included for one of the six wells. First posted September 29, 2020, ver. 1.0 Revised December 2022, ver. 1.1 Revised February 2024, ver. 2.0

This U.S. Geological Survey data release provides surface-water quality, streamflow, and groundwater-elevation data collected within the Central Pine Barrens (CPB) Region of Suffolk County, New York. The data were collected in cooperation with the Central Pine Barrens Commission and the Town of Brookhaven as part of a five-year comprehensive water-resources monitoring program. Water quality and quality-assurance data from seven sites on two rivers (Carmans River- 5 sites and Peconic River - 2 sites) in the CPB are included. Carmans River sites were sampled four times throughout the year (fall, winter, spring, and summer) and Peconic River sites were sampled twice throughout the year (fall and spring). Water-quality field parameters measured during each site visit are included. All samples were analyzed for nutrients, major inorganics, and alkalinity. An annual set of organic samples for pesticide and pharmaceutical analysis were collected at one Carmans River site and two Peconic River sites. Periodic groundwater-elevation data collected from six CPB wells are included. Continuous (15-mimute interval) groundwater-elevation data is included for one of the six wells.

This U.S. Geological Survey data release provides surface-water quality, streamflow, and groundwater-elevation data collected within the Central Pine Barrens (CPB) Region of Suffolk County, New York. The data were collected in cooperation with the Central Pine Barrens Commission and the Town of Brookhaven as part of a five-year comprehensive water-resources monitoring program. Water quality and quality-assurance data from seven sites on two rivers (Carmans River- 5 sites and Peconic River - 2 sites) in the CPB are included. Carmans River sites were sampled four times throughout the year (fall, winter, spring, and summer) and Peconic River sites were sampled twice throughout the year (fall and spring). Water-quality field parameters measured during each site visit are included. All samples were analyzed for nutrients, major inorganics, and alkalinity. An annual set of organic samples for pesticide and pharmaceutical analysis were collected at one Carmans River site and two Peconic River sites. Periodic groundwater-elevation data collected from six CPB wells are included. Continuous (15-mimute interval) groundwater-elevation data is included for one of the six wells.

This document provides a summary of surface water-quality, streamflow, and groundwater data collected by the U.S. Geological Survey (USGS) within the Central Pine Barrens (CPB) Region of Suffolk County, New York. The data were collected in cooperation with the Central Pine Barrens Commission and the Town of Brookhaven under a five-year comprehensive water resources monitoring program. The surface water-quality data within the CPB for the 2018 water year (October 1, 2017 to September 30, 2018) includes data from the Carmans River and the Peconic River. The streams were sampled several times throughout the year at seven pre-determined locations. The Carmans River was sampled at five locations: 1) CARMANS RIVER AT MIDDLE ISLAND NY (01304990; Bartlett), 2) CARMANS RIVER NEAR YAPHANK NY (01304995; Upper Lake), 3) CARMANS RIVER BELOW LOWER LAKE AT YAPHANK NY (01304998; Lower Lake), 4) CARMANS RIVER AT YAPHANK NY (01305000; Carmans Gage), and 5) CARMANS RIVER AT SOUTHHAVEN NY (01305040; Tidal). Site locations Upper Lake and Carmans Gage were sampled four times throughout the year (fall, winter, spring, and summer) while Bartlett, Lower Lake, and Tidal were sampled once (summer). The Peconic River was sampled at two locations: 1) PECONIC RIVER NEAR CALVERTON NY (01304440; Connecticut Ave) and 2) PECONIC RIVER AT RIVERHEAD NY (01304500; Peconic Gage). Each site was sampled twice throughout the year (fall and spring). Field measurements were taken at each site visit. All samples include an analysis for nutrients (SH1865), major inorganics (SH2710 and SH2750), and alkalinity (LC2109). Three sites (Connecticut Ave, Peconic Gage, and Carmans Gage) were sampled for pesticides(SH2437) and pharmaceuticals (SH2440). These data are available in this data report as well as the USGS National Water Information System: Web Interface (NWIS). In addition to surface water-quality, groundwater-quality data were collected from seven wells at various locations within the CPB. Each well was sampled once during the summer, and analyzed for nutrients (SH2755), major inorganics (SH2701), volatile organic compounds (SH4437), pesticides (SH2437), pharmaceuticals (SH2440), and per- and polyfluoroalkyl substances (PFAS). These groundwater data are not included in this data report but will become available on USGS NWIS as they are reviewed and approved (https://nwis.waterdata.usgs.gov/usa/nwis/qwdata). Streamflow for the Carmans River and the Peconic River was measured at the seven sites listed above, and at two additional sites for the Peconic River. Each stream has a continuous-record streamflow station (01305000, 01304500) with water-stage-gaging equipment. These data are reviewed and available in NWIS (http://waterdata.usgs.gov/nwis) and WaterWatch (http://waterwatch.usgs.gov). Groundwater data-collection intervals used by the USGS on Long Island generally are: (1) annual, which provides data needed for statistical studies and model calibration; (2) monthly, which provides data needed for water-availability, saltwater-intrusion, and groundwater/surface-water interaction studies, seasonal-trend analysis, and drought and flood monitoring; and (3) continuous-recording or real-time, which provides data needed for short-term trend analysis, recharge and tidal-variation studies, local groundwater-withdrawal monitoring. In the CPB, groundwater-level elevations are measured monthly by the USGS at 24 wells, and annually at an additional 31 wells. A total of three wells within the CPB are equipped with water-level recorders, which also provides insight into changing locations of stream start-of-flow along the Carmans and Peconic rivers. Of these sites, the CPB commission funded six groundwater wells (405308072553102, S 6413. 2; 405220072493101, S 6441. 2; 404915072531801, S 9129. 1; 405610072562501, S 40853. 2; 405301072415101, S 46542. 1; 405131072455701, S 46546. 1), one of which is a continuous recorder (S 6413. 2). These data are reviewed and available in NWIS

This document provides a summary of surface water-quality, streamflow, and groundwater data collected by the U.S. Geological Survey (USGS) within the Central Pine Barrens (CPB) Region of Suffolk County, New York. The data were collected in cooperation with the Central Pine Barrens Commission and the Town of Brookhaven under a five-year comprehensive water resources monitoring program. The surface water-quality data within the CPB for the 2018 water year (October 1, 2017 to September 30, 2018) includes data from the Carmans River and the Peconic River. The streams were sampled several times throughout the year at seven pre-determined locations. The Carmans River was sampled at five locations: 1) CARMANS RIVER AT MIDDLE ISLAND NY (01304990; Bartlett), 2) CARMANS RIVER NEAR YAPHANK NY (01304995; Upper Lake), 3) CARMANS RIVER BELOW LOWER LAKE AT YAPHANK NY (01304998; Lower Lake), 4) CARMANS RIVER AT YAPHANK NY (01305000; Carmans Gage), and 5) CARMANS RIVER AT SOUTHHAVEN NY (01305040; Tidal). Site locations Upper Lake and Carmans Gage were sampled four times throughout the year (fall, winter, spring, and summer) while Bartlett, Lower Lake, and Tidal were sampled once (summer). The Peconic River was sampled at two locations: 1) PECONIC RIVER NEAR CALVERTON NY (01304440; Connecticut Ave) and 2) PECONIC RIVER AT RIVERHEAD NY (01304500; Peconic Gage). Each site was sampled twice throughout the year (fall and spring). Field measurements were taken at each site visit. All samples include an analysis for nutrients (SH1865), major inorganics (SH2710 and SH2750), and alkalinity (LC2109). Three sites (Connecticut Ave, Peconic Gage, and Carmans Gage) were sampled for pesticides(SH2437) and pharmaceuticals (SH2440). These data are available in this data report as well as the USGS National Water Information System: Web Interface (NWIS). In addition to surface water-quality, groundwater-quality data were collected from seven wells at various locations within the CPB. Each well was sampled once during the summer, and analyzed for nutrients (SH2755), major inorganics (SH2701), volatile organic compounds (SH4437), pesticides (SH2437), pharmaceuticals (SH2440), and per- and polyfluoroalkyl substances (PFAS). These groundwater data are not included in this data report but will become available on USGS NWIS as they are reviewed and approved (https://nwis.waterdata.usgs.gov/usa/nwis/qwdata). Streamflow for the Carmans River and the Peconic River was measured at the seven sites listed above, and at two additional sites for the Peconic River. Each stream has a continuous-record streamflow station (01305000, 01304500) with water-stage-gaging equipment. These data are reviewed and available in NWIS (http://waterdata.usgs.gov/nwis) and WaterWatch (http://waterwatch.usgs.gov). Groundwater data-collection intervals used by the USGS on Long Island generally are: (1) annual, which provides data needed for statistical studies and model calibration; (2) monthly, which provides data needed for water-availability, saltwater-intrusion, and groundwater/surface-water interaction studies, seasonal-trend analysis, and drought and flood monitoring; and (3) continuous-recording or real-time, which provides data needed for short-term trend analysis, recharge and tidal-variation studies, local groundwater-withdrawal monitoring. In the CPB, groundwater-level elevations are measured monthly by the USGS at 24 wells, and annually at an additional 31 wells. A total of three wells within the CPB are equipped with water-level recorders, which also provides insight into changing locations of stream start-of-flow along the Carmans and Peconic rivers. Of these sites, the CPB commission funded six groundwater wells (405308072553102, S 6413. 2; 405220072493101, S 6441. 2; 404915072531801, S 9129. 1; 405610072562501, S 40853. 2; 405301072415101, S 46542. 1; 405131072455701, S 46546. 1), one of which is a continuous recorder (S 6413. 2). These data are reviewed and available in NWIS

This document provides a summary of surface water-quality, streamflow, and groundwater data collected by the U.S. Geological Survey (USGS) within the Central Pine Barrens (CPB) Region of Suffolk County, New York. The data were collected in cooperation with the Central Pine Barrens Commission and the Town of Brookhaven under a five-year comprehensive water resources monitoring program. The surface water-quality data within the CPB for the 2018 water year (October 1, 2017 to September 30, 2018) includes data from the Carmans River and the Peconic River. The streams were sampled several times throughout the year at seven pre-determined locations. The Carmans River was sampled at five locations: 1) CARMANS RIVER AT MIDDLE ISLAND NY (01304990; Bartlett), 2) CARMANS RIVER NEAR YAPHANK NY (01304995; Upper Lake), 3) CARMANS RIVER BELOW LOWER LAKE AT YAPHANK NY (01304998; Lower Lake), 4) CARMANS RIVER AT YAPHANK NY (01305000; Carmans Gage), and 5) CARMANS RIVER AT SOUTHHAVEN NY (01305040; Tidal). Site locations Upper Lake and Carmans Gage were sampled four times throughout the year (fall, winter, spring, and summer) while Bartlett, Lower Lake, and Tidal were sampled once (summer). The Peconic River was sampled at two locations: 1) PECONIC RIVER NEAR CALVERTON NY (01304440; Connecticut Ave) and 2) PECONIC RIVER AT RIVERHEAD NY (01304500; Peconic Gage). Each site was sampled twice throughout the year (fall and spring). Field measurements were taken at each site visit. All samples include an analysis for nutrients (SH1865), major inorganics (SH2710 and SH2750), and alkalinity (LC2109). Three sites (Connecticut Ave, Peconic Gage, and Carmans Gage) were sampled for pesticides(SH2437) and pharmaceuticals (SH2440). These data are available in this data report as well as the USGS National Water Information System: Web Interface (NWIS). In addition to surface water-quality, groundwater-quality data were collected from seven wells at various locations within the CPB. Each well was sampled once during the summer, and analyzed for nutrients (SH2755), major inorganics (SH2701), volatile organic compounds (SH4437), pesticides (SH2437), pharmaceuticals (SH2440), and per- and polyfluoroalkyl substances (PFAS). These groundwater data are not included in this data report but will become available on USGS NWIS as they are reviewed and approved (https://nwis.waterdata.usgs.gov/usa/nwis/qwdata). Streamflow for the Carmans River and the Peconic River was measured at the seven sites listed above, and at two additional sites for the Peconic River. Each stream has a continuous-record streamflow station (01305000, 01304500) with water-stage-gaging equipment. These data are reviewed and available in NWIS (http://waterdata.usgs.gov/nwis) and WaterWatch (http://waterwatch.usgs.gov). Groundwater data-collection intervals used by the USGS on Long Island generally are: (1) annual, which provides data needed for statistical studies and model calibration; (2) monthly, which provides data needed for water-availability, saltwater-intrusion, and groundwater/surface-water interaction studies, seasonal-trend analysis, and drought and flood monitoring; and (3) continuous-recording or real-time, which provides data needed for short-term trend analysis, recharge and tidal-variation studies, local groundwater-withdrawal monitoring. In the CPB, groundwater-level elevations are measured monthly by the USGS at 24 wells, and annually at an additional 31 wells. A total of three wells within the CPB are equipped with water-level recorders, which also provides insight into changing locations of stream start-of-flow along the Carmans and Peconic rivers. Of these sites, the CPB commission funded six groundwater wells (405308072553102, S 6413. 2; 405220072493101, S 6441. 2; 404915072531801, S 9129. 1; 405610072562501, S 40853. 2; 405301072415101, S 46542. 1; 405131072455701, S 46546. 1), one of which is a continuous recorder (S 6413. 2). These data are reviewed and available in NWIS

This U.S. Geological Survey data release provides surface-water quality, streamflow, and groundwater-elevation data collected within the Central Pine Barrens (CPB) Region of Suffolk County, New York, from October 1, 2020 through September 30, 2021. The data were collected in cooperation with the Central Pine Barrens Commission and the Town of Brookhaven as part of a five-year comprehensive water-resources monitoring program. Water quality and quality-assurance data from seven sites on two rivers (Carmans River- five sites and Peconic River- two sites) in the CPB are included. Carmans River sites were sampled four times throughout the year (fall, winter, spring, and summer) and Peconic River sites were sampled twice throughout the year (fall and spring). Water-quality field parameters measured during each site visit are included. All samples were analyzed for nutrients, major inorganics, and alkalinity. An annual set of organic samples for pesticide and pharmaceutical analysis were collected at one Carmans River site and two Peconic River sites. Periodic groundwater-elevation data collected from six CPB wells are included. Continuous (15-minute interval) groundwater-elevation data are included for one of the six wells.

This U.S. Geological Survey data release provides surface-water quality, streamflow, and groundwater-elevation data collected within the Central Pine Barrens (CPB) Region of Suffolk County, New York, from October 1, 2020 through September 30, 2021. The data were collected in cooperation with the Central Pine Barrens Commission and the Town of Brookhaven as part of a five-year comprehensive water-resources monitoring program. Water quality and quality-assurance data from seven sites on two rivers (Carmans River- five sites and Peconic River- two sites) in the CPB are included. Carmans River sites were sampled four times throughout the year (fall, winter, spring, and summer) and Peconic River sites were sampled twice throughout the year (fall and spring). Water-quality field parameters measured during each site visit are included. All samples were analyzed for nutrients, major inorganics, and alkalinity. An annual set of organic samples for pesticide and pharmaceutical analysis were collected at one Carmans River site and two Peconic River sites. Periodic groundwater-elevation data collected from six CPB wells are included. Continuous (15-minute interval) groundwater-elevation data are included for one of the six wells.

This U.S. Geological Survey data release provides surface-water quality, streamflow, and groundwater-elevation data collected within the Central Pine Barrens (CPB) Region of Suffolk County, New York, from October 1, 2019 through September 30, 2020. The data were collected in cooperation with the Central Pine Barrens Commission and the Town of Brookhaven as part of a five-year comprehensive water-resources monitoring program. Water quality and quality-assurance data from seven sites on two rivers (Carmans River- five sites and Peconic River- two sites) in the CPB are included. Carmans River sites were sampled four times throughout the year (fall, winter, spring, and summer) and Peconic River sites were sampled twice throughout the year (fall and spring). Water-quality field parameters measured during each site visit are included. All samples were analyzed for nutrients, major inorganics, and alkalinity. An annual set of organic samples for pesticide and pharmaceutical analysis were collected at one Carmans River site and two Peconic River sites. Periodic groundwater-elevation data collected from six CPB wells are included. Continuous (15-minute interval) groundwater-elevation data are included for one of the six wells. First posted October 12, 2021, ver. 1.0 Revised December 2022, ver. 1.1 Revised February 2024, ver. 2.0

This U.S. Geological Survey data release provides surface-water quality, streamflow, and groundwater-elevation data collected within the Central Pine Barrens (CPB) Region of Suffolk County, New York, from October 1, 2019 through September 30, 2020. The data were collected in cooperation with the Central Pine Barrens Commission and the Town of Brookhaven as part of a five-year comprehensive water-resources monitoring program. Water quality and quality-assurance data from seven sites on two rivers (Carmans River- five sites and Peconic River- two sites) in the CPB are included. Carmans River sites were sampled four times throughout the year (fall, winter, spring, and summer) and Peconic River sites were sampled twice throughout the year (fall and spring). Water-quality field parameters measured during each site visit are included. All samples were analyzed for nutrients, major inorganics, and alkalinity. An annual set of organic samples for pesticide and pharmaceutical analysis were collected at one Carmans River site and two Peconic River sites. Periodic groundwater-elevation data collected from six CPB wells are included. Continuous (15-minute interval) groundwater-elevation data are included for one of the six wells. First posted October 12, 2021, ver. 1.0 Revised December 2022, ver. 1.1 Revised February 2024, ver. 2.0