{"schemaVersion":2,"id":"us-MA3198000","communeId":"MA3198000","name":"Natick Water and Sewer Division","slug":"natick-water-and-sewer-division-ma3198000","country":"us","region":"Massachusetts","supplier":"NATICK WATER DEPARTMENT","networks":[{"code":"90001/10002","name":"Entry Point to Dist. System (Morses Pond Well)"},{"code":"90002/10003","name":"Entry Point to Dist. System (Pine Oaks Well #1)"},{"code":"90003/10011","name":"Entry Point to Dist. System (Elm Bank PS)"},{"code":"90004/10050","name":"Entry Point to Dist. System (Springvale WTP)"}],"latestSampleDate":"2025-06-11T00:00:00Z","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: granular activated carbon (GAC), no PFAS treatment (NMT). 4 entry points sampled, 8 sampling events between 2024-12-16 and 2025-06-11. The page's PFAS values come from the newest sample at Entry Point to Dist. System (Morses Pond Well) (90001/10002), 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":0.0408,"valueText":"0.0408","unit":"µg/L","limit":0.004,"limitUnit":"µg/L","status":"exceeded","sampleDate":"2025-06-11T00:00:00Z","sampleId":"M5E0249-01"},"pfas4DetectedCount":3,"lowerBound":true,"sampledAt":{"commune":"MA3198000","name":"Entry Point to Dist. System (Morses Pond Well)","network":"90001/10002"},"qualifiers":[{"name":"PFNA","valueText":"<0.004","unit":"µg/L"},{"name":"HFPO-DA","valueText":"<0.005","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":"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":"PFHpA","valueText":"<0.003","unit":"µg/L"},{"name":"PFHpS","valueText":"<0.003","unit":"µg/L"},{"name":"PFHxA","valueText":"<0.003","unit":"µg/L"},{"name":"PFMBA","valueText":"<0.003","unit":"µg/L"},{"name":"PFMPA","valueText":"<0.004","unit":"µg/L"},{"name":"PFPeA","valueText":"<0.003","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":"M5E0249-01","date":"2025-06-11","commune":"MA3198000","communeName":"NATICK WATER DEPARTMENT","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["90001/10002"],"sum20":null,"pfas4":{"value":0.0408,"valueText":"0.0408","unit":"µg/L","nonDetect":false,"lowerBound":true,"qualifiers":[{"name":"PFNA","valueText":"<0.004","unit":"µg/L"}]},"revision":"9d1901cf940c2c0978dc98251110b1aea8f8f1d02b10a2cfa635c3c05d5193c2"},{"id":"M5E0249-03","date":"2025-06-11","commune":"MA3198000","communeName":"NATICK WATER DEPARTMENT","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["90002/10003"],"sum20":null,"pfas4":{"value":0.0082,"valueText":"0.0082","unit":"µg/L","nonDetect":false,"lowerBound":true,"qualifiers":[{"name":"PFHxS","valueText":"<0.003","unit":"µg/L"},{"name":"PFNA","valueText":"<0.004","unit":"µg/L"}]},"revision":"0edcbdaf3f73bf787888e70f386618e04eb528a0d63b3aee055fa1f9481c3b04"},{"id":"M5E0249-05","date":"2025-06-11","commune":"MA3198000","communeName":"NATICK WATER DEPARTMENT","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["90003/10011"],"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":"55e1fd6a2557ae1b8613ab47f8f9391797fb4f2add331ca37aa3795b603ce88b"},{"id":"M5E0249-07","date":"2025-06-11","commune":"MA3198000","communeName":"NATICK WATER DEPARTMENT","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["90004/10050"],"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":"f004b65844eda66c1dcb19e9cf222d6d73403c52d95e4a6a27372f2a1cedd4b1"},{"id":"M4K0668-01","date":"2024-12-16","commune":"MA3198000","communeName":"NATICK WATER DEPARTMENT","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["90002/10003"],"sum20":null,"pfas4":{"value":0.004,"valueText":"0.004","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":"e73fece477f01a95e1a1c6633970ae540b3af98ab40770d70eb6d1a1034638fc"},{"id":"M4K0668-03","date":"2024-12-16","commune":"MA3198000","communeName":"NATICK WATER DEPARTMENT","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["90003/10011"],"sum20":null,"pfas4":{"value":0.004,"valueText":"0.004","unit":"µg/L","nonDetect":false,"lowerBound":true,"qualifiers":[{"name":"PFOA","valueText":"<0.004","unit":"µg/L"},{"name":"PFHxS","valueText":"<0.003","unit":"µg/L"},{"name":"PFNA","valueText":"<0.004","unit":"µg/L"}]},"revision":"624dd29fa11ae7e7bfbd59f0e594b7c3dce18bd4aa5648693ffc71e2ae83eac0"},{"id":"M4K0668-05","date":"2024-12-16","commune":"MA3198000","communeName":"NATICK WATER 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DEPARTMENT","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["90001/10002"],"sum20":null,"pfas4":{"value":0.0628,"valueText":"0.0628","unit":"µg/L","nonDetect":false,"lowerBound":true,"qualifiers":[{"name":"PFNA","valueText":"<0.004","unit":"µg/L"}]},"revision":"102880a6d726e551876f57ccd5deed9c18eacda93b02b25b35e1e197fcc4a883"}],"revision":"13edd956f8ca91ee2d3b6fbdb49f76b0015ee5dc3b79aeb305944e25daaabdb2","us":{"pwsid":"MA3198000","state":"MA","systemType":"CWS","sizeClass":"L","sourceWater":["GW"],"counties":["Middlesex"],"zips":["01760","02030","02482"],"entryPoints":4,"samples":8,"detectedCompounds":["PFOA","PFOS","PFHxS","PFBS","PFBA","PFPeA"],"treatment":["GAC","NMT"],"potentialSources":"DK","pfoaMax":0.0143,"pfosMax":0.0373,"hazardIndex":0.4015,"centroidSource":"sab"}}