Is there PFAS in Manville WSC water?
Yes. EPA's final UCMR 5 results show Manville WSC averaged 11.0 ppt of PFOS at its worst sampling point, 2.8 times the EPA limit of 4 ppt.
Manville WSC
Serves 39,648 people · 20 PFOA samples from 9 sampling points · Feb 2023 to Nov 2023
Average above an EPA limit
PFOA Perfluorooctanoic acid
2.9 ppt avg · max 5.9
PFOS Perfluorooctanesulfonic acid
11.0 ppt avg · max 12.4
PFHxS Perfluorohexanesulfonic acid
6.8 ppt avg · max 7.0
PFNA Perfluorononanoic acid
16.5 ppt avg · max 24.3
Hazard index GenX, PFBS, PFNA, PFHxS combined
2.3 avg · max 3.1
Also detected, no federal limit: PFBS, PFPeA, PFHxA, PFBA, PFHpA, PFUnA.
Manville WSC is a public water system drawing on surface water, based in Coupland, Texas, serving about 39,648 people, including Taylor, Thrall, Spring, Coupland, Elgin, Hutto. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 20 times across 9 sampling points between Feb 2023 and Nov 2023.
Every PFAS detected
Not detected: PFTrDA, 4:2 FTS, 8:2 FTS, PFMPA, PFEESA, NFDHA, PFPeS, PFTA, NEtFOSAA, 6:2 FTS, NMeFOSAA, PFDoA, PFHpS, HFPO-DA, ADONA, 9Cl-PF3ONS, 11Cl-PF3OUdS, PFMBA, PFDA.
Lithium, tested in the same program: highest 83.8 ppb, detected in 17 of 20 samples. EPA's health-based screening level is 10 ppb.
What the EPA limits mean here
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.
What you can do at home
Two routes work for PFAS. For drinking and cooking water only, a reverse osmosis system certified to NSF/ANSI 58 with a PFOA/PFOS reduction claim is the cheapest proven option. To treat every tap and shower, a whole-house carbon system with enough contact time works, but check that the maker has PFAS test data, not just a marketing claim. See the best filters for PFAS and how PFAS removal works.
Other systems in Texas
All 1154 tested systems in Texas
ZIP codes served
76574 76578 77388 78615 78621 78634 78653 78660 78664 78665 78681 78683 78691 78708 78709 78714 78723 78724 78725 78731 78746 78750 78753 78755 78758 78767 78768
As reported by the utility to EPA. Neighbouring ZIPs are often split between systems; your water bill names yours.
Cite this page
Well & Tap. "PFAS in Manville WSC water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID TX2270033. https://wellandtap.com/pfas/texas/manville-wsc/
About this data
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID TX2270033). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
