{"schemaVersion":2,"id":"us-MA3330019","communeId":"MA3330019","name":"Haystack Estates","slug":"haystack-estates-ma3330019","country":"us","region":"Massachusetts","supplier":"HAYSTACK ESTATES","networks":[{"code":"333001901G/MULT","name":"TREATED WATER: WELL #1 & #2 (WELL # 1)"}],"latestSampleDate":"2025-11-04T00:00:00Z","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. 1 entry point sampled, 2 sampling events between 2025-05-06 and 2025-11-04. The page's PFAS values come from the newest sample at TREATED WATER: WELL #1 & #2 (WELL # 1) (333001901G/MULT). 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":"2025-11-04T00:00:00Z","sampleId":"133868P"},"pfas4DetectedCount":1,"lowerBound":true,"sampledAt":{"commune":"MA3330019","name":"TREATED WATER: WELL #1 & #2 (WELL # 1)","network":"333001901G/MULT"},"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":"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":"133868P","date":"2025-11-04","commune":"MA3330019","communeName":"HAYSTACK ESTATES","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["333001901G/MULT"],"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":"7a0abb2c5e13791fc30bcbc679f19a36c299e0161a7bbbd5a6c384d3bb5a7e97"},{"id":"128499P","date":"2025-05-06","commune":"MA3330019","communeName":"HAYSTACK ESTATES","sourceUrl":"https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule","networks":["333001901G/MULT"],"sum20":null,"pfas4":{"value":0.0052,"valueText":"0.0052","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":"47f80ca4efe77ad4153526ce8b6d3dbec8a40662c775a3c66429fe0dcaa0fb07"}],"revision":"43959b9278ee604b9ee2facdc1a84303c348f5803f3df88f64c9755cee700183","us":{"pwsid":"MA3330019","state":"MA","systemType":"CWS","sizeClass":"S","sourceWater":["GW"],"counties":["Middlesex"],"zips":["01886"],"entryPoints":1,"samples":2,"detectedCompounds":["PFOA","PFBS","PFHxA","PFPeA"],"treatment":[],"potentialSources":"No","pfoaMax":0.0056,"pfosMax":null,"hazardIndex":0.0017,"centroidSource":"sab"}}