{"schemaVersion":2,"id":"us-NY2902858","communeId":"NY2902858","name":"Williston Park (V)","slug":"williston-park-v-ny2902858","country":"us","region":"New York","supplier":"WILLISTON PARK (V)","networks":[{"code":"CHEM12727/CHEM12727","name":"WELL 1A TREATED (WILLISTON PARK (V))"},{"code":"CHEMCW08248/CHCW08248","name":"WELL 4 CLEARWELL:CL2 (WILLISTON PARK (V))"}],"latestSampleDate":"2023-08-28T00:00:00Z","conformity":{"conclusion":null,"bacteriological":"unknown","chemical":"unknown"},"source":{"name":"U.S. Environmental Protection Agency, Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) occurrence data, final dataset (August 2026)","url":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","license":"Public domain (U.S. federal government work, 17 U.S.C. § 105)","kind":"open_data_file","verified":true,"retrievedAt":"2026-09-19T19:22:35.464Z","note":"UCMR 5 results do not indicate compliance or noncompliance with the PFAS drinking water standards. Samples are taken at the entry point to the distribution system, not at the tap; the system may have changed sources or installed treatment since. Treatment reported to EPA for PFAS: no PFAS treatment (NMT). 2 entry points sampled, 5 sampling events between 2023-01-17 and 2023-08-28. The page's PFAS values come from the newest sample at WELL 4 CLEARWELL:CL2 (WILLISTON PARK (V)) (CHEMCW08248/CHCW08248), the entry point with the highest PFOA + PFOS + PFNA + PFHxS sum; the other entry points' maxima are listed as separate rows. Non-detects are shown as \"<\" followed by EPA's minimum reporting level (3 to 20 ng/L); PFAS-4 sums quantified compounds only, so it is a lower bound when a compound was not detected. Registry (name, population, counties, ZIPs) from EPA SDWIS/ECHO; service-area centroid from EPA ORD."},"pfas":{"status":"measured","sum20":null,"pfas4":{"value":0.0133,"valueText":"0.0133","unit":"µg/L","limit":0.004,"limitUnit":"µg/L","status":"exceeded","sampleDate":"2023-08-28T00:00:00Z","sampleId":"108419R"},"pfas4DetectedCount":2,"lowerBound":true,"sampledAt":{"commune":"NY2902858","name":"WELL 4 CLEARWELL:CL2 (WILLISTON PARK (V))","network":"CHEMCW08248/CHCW08248"},"qualifiers":[{"name":"PFOS","valueText":"<0.004","unit":"µg/L"},{"name":"PFHxS","valueText":"<0.003","unit":"µg/L"},{"name":"HFPO-DA","valueText":"<0.005","unit":"µg/L"},{"name":"PFBS","valueText":"<0.003","unit":"µg/L"},{"name":"11Cl-PF3OUdS","valueText":"<0.005","unit":"µg/L"},{"name":"4:2 FTS","valueText":"<0.003","unit":"µg/L"},{"name":"6:2 FTS","valueText":"<0.005","unit":"µg/L"},{"name":"8:2 FTS","valueText":"<0.005","unit":"µg/L"},{"name":"9Cl-PF3ONS","valueText":"<0.002","unit":"µg/L"},{"name":"ADONA","valueText":"<0.003","unit":"µg/L"},{"name":"NFDHA","valueText":"<0.02","unit":"µg/L"},{"name":"PFBA","valueText":"<0.005","unit":"µg/L"},{"name":"PFDA","valueText":"<0.003","unit":"µg/L"},{"name":"PFDoA","valueText":"<0.003","unit":"µg/L"},{"name":"PFEESA","valueText":"<0.003","unit":"µg/L"},{"name":"PFHpS","valueText":"<0.003","unit":"µg/L"},{"name":"PFMBA","valueText":"<0.003","unit":"µg/L"},{"name":"PFMPA","valueText":"<0.004","unit":"µg/L"},{"name":"PFPeS","valueText":"<0.004","unit":"µg/L"},{"name":"PFUnA","valueText":"<0.002","unit":"µg/L"}],"comparison":{"proposed":{"value":0.0005,"period":"annual_mean","official":false,"state":"over"},"sweden":{"value":0.004,"jurisdiction":"se"},"franceSum20":{"value":0.1,"jurisdiction":"fr"}}},"samples":[{"id":"108419R","date":"2023-08-28","commune":"NY2902858","communeName":"WILLISTON PARK (V)","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["CHEMCW08248/CHCW08248"],"sum20":null,"pfas4":{"value":0.0133,"valueText":"0.0133","unit":"µg/L","nonDetect":false,"lowerBound":true,"qualifiers":[{"name":"PFOS","valueText":"<0.004","unit":"µg/L"},{"name":"PFHxS","valueText":"<0.003","unit":"µg/L"}]},"revision":"31b4fcda5a0af297a89f09f67e99447ef9f44e03b1ea45ffc753536fe84534c6"},{"id":"106013P","date":"2023-07-18","commune":"NY2902858","communeName":"WILLISTON PARK (V)","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["CHEM12727/CHEM12727"],"sum20":null,"pfas4":{"value":null,"valueText":"<0.015","unit":"µg/L","nonDetect":true,"lowerBound":true,"qualifiers":[{"name":"PFOA","valueText":"<0.004","unit":"µg/L"},{"name":"PFOS","valueText":"<0.004","unit":"µg/L"},{"name":"PFHxS","valueText":"<0.003","unit":"µg/L"},{"name":"PFNA","valueText":"<0.004","unit":"µg/L"}]},"revision":"6ba8896050d25d6357bb376f9c10dde1bdb136363875c0aa425b2376bb4751af"},{"id":"100489P","date":"2023-01-17","commune":"NY2902858","communeName":"WILLISTON PARK (V)","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["CHEM12727/CHEM12727"],"sum20":null,"pfas4":{"value":null,"valueText":"<0.015","unit":"µg/L","nonDetect":true,"lowerBound":true,"qualifiers":[{"name":"PFOA","valueText":"<0.004","unit":"µg/L"},{"name":"PFOS","valueText":"<0.004","unit":"µg/L"},{"name":"PFHxS","valueText":"<0.003","unit":"µg/L"},{"name":"PFNA","valueText":"<0.004","unit":"µg/L"}]},"revision":"7a93013774727e03b92a0227569ef87b1a4f87ba9401243faa04ad0d5d08e841"},{"id":"100490P","date":"2023-01-17","commune":"NY2902858","communeName":"WILLISTON PARK (V)","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["CHEMCW08248/CHCW08248"],"sum20":null,"pfas4":{"value":0.0126,"valueText":"0.0126","unit":"µg/L","nonDetect":false,"lowerBound":true,"qualifiers":[{"name":"PFOS","valueText":"<0.004","unit":"µg/L"},{"name":"PFHxS","valueText":"<0.003","unit":"µg/L"}]},"revision":"0c06ab44ebbb725dc10e198e87731b6140822b17e92587a76c43dd66b340d7c5"}],"revision":"212bddcd74135f4374d3cec2aeeedacc82bf779db61507a4aa5becaf8e4cdd1d","us":{"pwsid":"NY2902858","state":"NY","systemType":"CWS","sizeClass":"S","sourceWater":["GW"],"counties":["Nassau"],"zips":["11596"],"entryPoints":2,"samples":5,"detectedCompounds":["PFOA","PFNA","PFHpA","PFHxA","PFPeA"],"treatment":["NMT"],"potentialSources":"DK","pfoaMax":0.0056,"pfosMax":null,"hazardIndex":0.77,"centroidSource":"sab"}}