{"schemaVersion":2,"id":"us-MA4131000","communeId":"MA4131000","name":"Weir River Water System","slug":"weir-river-water-system-ma4131000","country":"us","region":"Massachusetts","supplier":"WEIR RIVER WATER SYSTEM","networks":[{"code":"00021/EP003","name":"Entry Point to Dist. System (Cohasset Intertie)"},{"code":"10562/EP001","name":"Entry Point to Dist. System (Hingham/Hull District WTF)"}],"latestSampleDate":"2025-08-18T00:00:00Z","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, 10 sampling events between 2024-11-06 and 2025-08-18. The page's PFAS values come from the newest sample at Entry Point to Dist. System (Cohasset Intertie) (00021/EP003), 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":0.0064,"valueText":"0.0064","unit":"µg/L","limit":0.004,"limitUnit":"µg/L","status":"exceeded","sampleDate":"2025-08-18T00:00:00Z","sampleId":"35977434001SE4"},"pfas4DetectedCount":1,"lowerBound":true,"sampledAt":{"commune":"MA4131000","name":"Entry Point to Dist. System (Cohasset Intertie)","network":"00021/EP003"},"qualifiers":[{"name":"PFOS","valueText":"<0.004","unit":"µg/L"},{"name":"PFHxS","valueText":"<0.003","unit":"µg/L"},{"name":"PFNA","valueText":"<0.004","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":"NEtFOSAA","valueText":"<0.005","unit":"µg/L"},{"name":"NFDHA","valueText":"<0.02","unit":"µg/L"},{"name":"NMeFOSAA","valueText":"<0.006","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":"PFHpA","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":"PFTA","valueText":"<0.008","unit":"µg/L"},{"name":"PFTrDA","valueText":"<0.007","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":"35977434001SE4","date":"2025-08-18","commune":"MA4131000","communeName":"WEIR RIVER WATER SYSTEM","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["00021/EP003"],"sum20":null,"pfas4":{"value":0.0064,"valueText":"0.0064","unit":"µg/L","nonDetect":false,"lowerBound":true,"qualifiers":[{"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":"63e543c2635376d389b5cb1125fbbb702c39323f1f252717c7a51d9d57e8768b"},{"id":"35977434003SE4","date":"2025-08-18","commune":"MA4131000","communeName":"WEIR RIVER WATER SYSTEM","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["10562/EP001"],"sum20":null,"pfas4":{"value":0.0056,"valueText":"0.0056","unit":"µg/L","nonDetect":false,"lowerBound":true,"qualifiers":[{"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":"65666f1161a60bc5f1eab8ae6d19a008f332b1ce110c7647fe6468f9adac0003"},{"id":"35957389001SE3","date":"2025-05-21","commune":"MA4131000","communeName":"WEIR RIVER WATER SYSTEM","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["00021/EP003"],"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":"741c94581f49be303fbef7af4b902f112acc0d1d7cdadd179a4c4f0cfd3d6e6d"},{"id":"35957389003SE3","date":"2025-05-21","commune":"MA4131000","communeName":"WEIR RIVER WATER SYSTEM","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["10562/EP001"],"sum20":null,"pfas4":{"value":0.005,"valueText":"0.005","unit":"µg/L","nonDetect":false,"lowerBound":true,"qualifiers":[{"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":"0f7403405e3373189a8006c951de87f5ed9d11f88de4892528695bdaa25a0051"},{"id":"35939752001SE2","date":"2025-02-26","commune":"MA4131000","communeName":"WEIR RIVER WATER SYSTEM","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["00021/EP003"],"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":"adf38f6453aca8510a3c1b2d2cf86e7591c68bf6ea224cc0703b2c32e224ebdb"},{"id":"35939752003SE2","date":"2025-02-26","commune":"MA4131000","communeName":"WEIR RIVER WATER SYSTEM","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["10562/EP001"],"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":"f0b1fbad069d0e7d61e127749b6ec70ccd5ee7f90dd81488b6283862350bbc14"},{"id":"35917521001SE1","date":"2024-11-06","commune":"MA4131000","communeName":"WEIR RIVER WATER 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SYSTEM","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["10562/EP001"],"sum20":null,"pfas4":{"value":0.0043,"valueText":"0.0043","unit":"µg/L","nonDetect":false,"lowerBound":true,"qualifiers":[{"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":"66dfc6c19dcefd73c2c8f0b506b91795b19272a44ef8f01c245e1272ab7fe3f7"}],"revision":"e97eebfd8ae474603a70e1a0c9ca170d68c9df3b6d43db9c70b9e9fe95f710ca","us":{"pwsid":"MA4131000","state":"MA","systemType":"CWS","sizeClass":"L","sourceWater":["SW"],"counties":["Plymouth"],"zips":["02025","02043","02045"],"entryPoints":2,"samples":10,"detectedCompounds":["PFOA","PFBS","PFBA","PFHxA","PFPeA"],"treatment":["NMT"],"potentialSources":"No","pfoaMax":0.0064,"pfosMax":null,"hazardIndex":null,"centroidSource":"sab"}}