{"schemaVersion":2,"id":"us-MA3031000","communeId":"MA3031000","name":"Billerica Water Works","slug":"billerica-water-works-ma3031000","country":"us","region":"Massachusetts","supplier":"BILLERICA WATER WORKS","networks":[{"code":"90001/10185","name":"Entry Point to Dist. System (Treble Cove Rd WTP - Finished)"}],"latestSampleDate":"2025-08-07T00:00:00Z","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). 1 entry point sampled, 4 sampling events between 2024-11-07 and 2025-08-07. The page's PFAS values come from the newest sample at Entry Point to Dist. System (Treble Cove Rd WTP - Finished) (90001/10185). 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":0.0055,"valueText":"0.0055","unit":"µg/L","limit":0.004,"limitUnit":"µg/L","status":"exceeded","sampleDate":"2025-08-07T00:00:00Z","sampleId":"810-159147-1"},"pfas4DetectedCount":1,"lowerBound":true,"sampledAt":{"commune":"MA3031000","name":"Entry Point to Dist. System (Treble Cove Rd WTP - Finished)","network":"90001/10185"},"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":"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":"810-159147-1","date":"2025-08-07","commune":"MA3031000","communeName":"BILLERICA WATER WORKS","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["90001/10185"],"sum20":null,"pfas4":{"value":0.0055,"valueText":"0.0055","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":"73067c70b39a2bb015a4100744072429a0a8fd3b769eb135a47c61274299c0a9"},{"id":"810-147966-1","date":"2025-05-08","commune":"MA3031000","communeName":"BILLERICA WATER WORKS","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["90001/10185"],"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":"358409905ee9ee814af398d0abeffcbaf07a8fe8e1d81bb303b5b0a2ba61c9d4"},{"id":"810-136931-1","date":"2025-02-05","commune":"MA3031000","communeName":"BILLERICA WATER WORKS","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["90001/10185"],"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":"cf937841f9b966874c9b68e1066dfc97254725046c5035b5c90d5422898e60b9"},{"id":"810-127366-1","date":"2024-11-07","commune":"MA3031000","communeName":"BILLERICA WATER WORKS","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["90001/10185"],"sum20":null,"pfas4":{"value":0.0042,"valueText":"0.0042","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":"b31b85ab489ff044cf229e228aaa56052fff3cda8f563c40c61e3b930159ad12"}],"revision":"2694f0afe13837ab37e0f0f8c7dd0157a4606cd60209f15046a180ab02b4ed10","us":{"pwsid":"MA3031000","state":"MA","systemType":"CWS","sizeClass":"L","sourceWater":["SW"],"counties":["Middlesex"],"zips":["01821","01822","01862","01865","01866"],"entryPoints":1,"samples":4,"detectedCompounds":["PFOA","PFBS","PFBA","PFHxA","PFPeA"],"treatment":["NMT"],"potentialSources":"Yes","pfoaMax":0.0055,"pfosMax":null,"hazardIndex":0.0016,"centroidSource":"sab"}}