{"schemaVersion":2,"id":"us-MA4118000","communeId":"MA4118000","name":"Halifax Water Department","slug":"halifax-water-department-ma4118000","country":"us","region":"Massachusetts","supplier":"HALIFAX WATER DEPARTMENT","networks":[{"code":"411800001G/10000","name":"Well #1 Richmond Park (Well#1 Richmond Park)"},{"code":"411800002G/10001","name":"Well #2 Richmond Park"},{"code":"411800003G/10002","name":"Well #3 YMCA"},{"code":"411800004G/10010","name":"Well #4 YMCA"}],"latestSampleDate":"2025-11-18T00:00:00Z","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). 4 entry points sampled, 8 sampling events between 2024-01-10 and 2025-11-18. The page's PFAS values come from the newest sample at Well #1 Richmond Park (Well#1 Richmond Park) (411800001G/10000), 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":0.0179,"valueText":"0.0179","unit":"µg/L","limit":0.004,"limitUnit":"µg/L","status":"exceeded","sampleDate":"2025-11-18T00:00:00Z","sampleId":"118623P"},"pfas4DetectedCount":3,"lowerBound":true,"sampledAt":{"commune":"MA4118000","name":"Well #1 Richmond Park (Well#1 Richmond Park)","network":"411800001G/10000"},"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":"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":"118623P","date":"2025-11-18","commune":"MA4118000","communeName":"HALIFAX WATER DEPARTMENT","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["411800001G/10000"],"sum20":null,"pfas4":{"value":0.0179,"valueText":"0.0179","unit":"µg/L","nonDetect":false,"lowerBound":true,"qualifiers":[{"name":"PFNA","valueText":"<0.004","unit":"µg/L"}]},"revision":"33a20953f350f75851662226892f5fdf9865b8ef7919195bfda8b16bfe619d1d"},{"id":"118624P","date":"2025-11-18","commune":"MA4118000","communeName":"HALIFAX WATER DEPARTMENT","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["411800002G/10001"],"sum20":null,"pfas4":{"value":0.0094,"valueText":"0.0094","unit":"µg/L","nonDetect":false,"lowerBound":true,"qualifiers":[{"name":"PFOS","valueText":"<0.004","unit":"µg/L"},{"name":"PFNA","valueText":"<0.004","unit":"µg/L"}]},"revision":"0d7797950225ad023efa06843296fde6744ae8ee933c0790146c3984dafaa02b"},{"id":"118625P","date":"2024-07-09","commune":"MA4118000","communeName":"HALIFAX WATER DEPARTMENT","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["411800003G/10002"],"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":"65579802db3dfe60e4597f43cbafcadd3f326d9eff97ef30504959e5e578663a"},{"id":"118626P","date":"2024-07-09","commune":"MA4118000","communeName":"HALIFAX WATER DEPARTMENT","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["411800004G/10010"],"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":"c11e3c3aabb6668a992a14156b7c6ee5f601434ea5c821c3bea9784192aa51cd"},{"id":"111971P","date":"2024-01-10","commune":"MA4118000","communeName":"HALIFAX WATER DEPARTMENT","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["411800001G/10000"],"sum20":null,"pfas4":{"value":0.0094,"valueText":"0.0094","unit":"µg/L","nonDetect":false,"lowerBound":true,"qualifiers":[{"name":"PFOS","valueText":"<0.004","unit":"µg/L"},{"name":"PFNA","valueText":"<0.004","unit":"µg/L"}]},"revision":"baaedf0ff618ca5ad00228caa93c2b9204748df9145188dd7a024cc1082f07c3"},{"id":"111972P","date":"2024-01-10","commune":"MA4118000","communeName":"HALIFAX WATER 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