No PFAS were detected in any of the 4 samples EPA's program collected.
Boston Water and Sewer Commission (mwra) is a public water system drawing on surface water, based in Boston, Massachusetts, serving about 675,647 people, including Boston, Roxbury, Roxbury Crossing, Dorchester, Dorchester Center, Mattapan. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 4 times across 1 sampling point between Jan 2024 and Oct 2024.
None of the 29 PFAS were found at or above EPA's minimum reporting levels (2 to 20 ppt depending on the compound).
Not detected: PFMBA, HFPO-DA, PFBA, 6:2 FTS, 4:2 FTS, 8:2 FTS, NFDHA, PFPeA, PFPeS, PFDA, PFHpS, PFBS, ADONA, PFMPA, PFOS, PFTA, PFEESA, PFHpA, PFHxS, PFNA, 9Cl-PF3ONS, PFTrDA, NEtFOSAA, NMeFOSAA, PFOA, PFDoA, PFHxA, PFUnA, 11Cl-PF3OUdS.
Lithium, tested in the same program: not detected.
In April 2024 EPA set enforceable limits of 4 ppt for PFOA and PFOS, 10 ppt each for PFHxS, PFNA and GenX, and a hazard index of 1 for mixtures. Utilities were given until 2029 to comply. In May 2026 EPA proposed keeping only the PFOA and PFOS limits and moving that deadline to 2031. Until that proposal is final, the 2024 limits stand.
Compliance is judged on a running annual average at each entry point, so we show the average at this system's worst sampling point next to its single highest result. UCMR 5 results do not by themselves put a utility in or out of compliance.
No PFAS action is needed on these results. If your water tastes or smells of chlorine, a whole-house city water filter is the usual fix.
All 263 tested systems in Massachusetts
02108 02109 02110 02111 02112 02113 02114 02115 02116 02117 02118 02119 02120 02121 02122 02123 02124 02125 02126 02127 02128 02129 02130 02131 02132 02133 02134 02135 02136 02137 02163 02196 02199 02201 02203 02204 02205 02206 02210 02211 02212 02215 02217 02222 02241 02283 02284 02293 02297 02298
As reported by the utility to EPA. Neighbouring ZIPs are often split between systems; your water bill names yours.
Well & Tap. "PFAS in Boston Water and Sewer Commission (mwra) water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID MA3035000. https://wellandtap.com/pfas/massachusetts/boston-water-and-sewer-commission-mwra/
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID MA3035000). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
