{"schemaVersion":2,"id":"us-MA3180000","communeId":"MA3180000","name":"Merrimac Water Department","slug":"merrimac-water-department-ma3180000","country":"us","region":"Massachusetts","supplier":"MERRIMAC WATER DEPARTMENT","networks":[{"code":"318000002G/10543","name":"BEAR HILL WELLS (SARGENT'S PIT)"},{"code":"318000004G/10546","name":"E. MAIN GWTP (WALLACE WAY) (E. MAIN ST 8\" GD REPLACEMENT WELLS  (4))"}],"latestSampleDate":"2024-07-09T00:00:00Z","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, 4 sampling events between 2024-01-17 and 2024-07-09. The page's PFAS values come from the newest sample at BEAR HILL WELLS (SARGENT'S PIT) (318000002G/10543), 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":0.0056,"valueText":"0.0056","unit":"µg/L","limit":0.004,"limitUnit":"µg/L","status":"exceeded","sampleDate":"2024-07-09T00:00:00Z","sampleId":"118535P"},"pfas4DetectedCount":1,"lowerBound":true,"sampledAt":{"commune":"MA3180000","name":"BEAR HILL WELLS (SARGENT'S PIT)","network":"318000002G/10543"},"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":"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":"118535P","date":"2024-07-09","commune":"MA3180000","communeName":"MERRIMAC WATER DEPARTMENT","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["318000002G/10543"],"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":"151f632a37fadc7e3117e18a2068930ddd7e9c8a30b45589e11c27e433ebb58f"},{"id":"118536P","date":"2024-07-09","commune":"MA3180000","communeName":"MERRIMAC WATER DEPARTMENT","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["318000004G/10546"],"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":"ae3eb2e5e8da3bb1f902b882684072b1114e6e43003161a4e0006df0a01ff9f9"},{"id":"111958P","date":"2024-01-17","commune":"MA3180000","communeName":"MERRIMAC WATER DEPARTMENT","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["318000002G/10543"],"sum20":null,"pfas4":{"value":0.0069,"valueText":"0.0069","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":"871c3235d590efb35fffbe3194544ba2100e1af2c305ce9239468e2df2e9e572"},{"id":"111959P","date":"2024-01-17","commune":"MA3180000","communeName":"MERRIMAC WATER DEPARTMENT","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["318000004G/10546"],"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":"ab7de862634a8a94eb5f99e37497123c3353b7d6955a922b128397ebd709e4da"}],"revision":"a8808463ee99b9da952552ec2ace9581ff830170c037e7475577f304a451c70c","us":{"pwsid":"MA3180000","state":"MA","systemType":"CWS","sizeClass":"S","sourceWater":["GW"],"counties":["Essex"],"zips":["01860"],"entryPoints":2,"samples":4,"detectedCompounds":["PFOA"],"treatment":["NMT"],"potentialSources":"No","pfoaMax":0.0069,"pfosMax":null,"hazardIndex":null,"centroidSource":"sab"}}