No PFAS were detected in any of the 3 samples EPA's program collected.
Mawc Yough Plant is a public water system drawing on surface water, based in Greensburg, Pennsylvania, serving about 133,000 people, including Belle Vernon, Buena Vista, Donora, Monongahela, Sutersville, West Newton. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 3 times across 1 sampling point between Sep 2024 and Jun 2025.
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: PFHxA, PFBS, PFDA, PFOA, PFOS, PFNA, PFHxS, PFDoA, PFEESA, PFUnA, PFPeA, PFBA, PFHpA, 6:2 FTS, 4:2 FTS, 8:2 FTS, PFMBA, PFTA, PFTrDA, NMeFOSAA, ADONA, NEtFOSAA, 11Cl-PF3OUdS, PFHpS, PFPeS, NFDHA, HFPO-DA, PFMPA, 9Cl-PF3ONS.
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 390 tested systems in Pennsylvania
15012 15018 15033 15063 15083 15089 15473 15479 15601 15612 15619 15624 15625 15631 15637 15639 15640 15642 15650 15663 15666 15670 15672 15676 15678 15679 15683 15693 15695 15697 15698
As reported by the utility to EPA. Neighbouring ZIPs are often split between systems; your water bill names yours.
Well & Tap. "PFAS in Mawc Yough Plant water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID PA5260036. https://wellandtap.com/pfas/pennsylvania/mawc-yough-plant/
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID PA5260036). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
