Is there PFAS in Sharyland WSC water?
Some. At least one sample reached an EPA limit, but the average at every sampling point stayed below it.
Sharyland WSC
Serves 68,562 people · 12 PFOA samples from 3 sampling points · Jul 2024 to Oct 2025
One or more samples at an EPA limit
PFOA Perfluorooctanoic acid
1.1 ppt avg · max 4.3
PFOS Perfluorooctanesulfonic acid
2.9 ppt avg · max 6.8
PFHxS Perfluorohexanesulfonic acid
2.5 ppt avg · max 6.4
Hazard index GenX, PFBS, PFNA, PFHxS combined
0.3 avg · max 0.6
Also detected, no federal limit: PFHxA, PFPeA, PFBA, PFHpA, PFBS.
Sharyland WSC is a public water system drawing on surface water, based in Mission, Texas, serving about 68,562 people, including Mcallen, Edinburg, Linn, Mission. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 12 times across 3 sampling points between Jul 2024 and Oct 2025.
Every PFAS detected
Not detected: PFHpS, 6:2 FTS, 4:2 FTS, 8:2 FTS, PFMPA, PFMBA, PFEESA, PFPeS, NFDHA, PFTA, PFTrDA, NEtFOSAA, NMeFOSAA, HFPO-DA, PFNA, 9Cl-PF3ONS, ADONA, 11Cl-PF3OUdS, PFUnA, PFDoA, PFDA.
Lithium, tested in the same program: highest 41.3 ppb, detected in 12 of 12 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
78504 78539 78541 78563 78572 78573 78574
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 Sharyland WSC water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID TX1080033. https://wellandtap.com/pfas/texas/sharyland-wsc/
About this data
Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID TX1080033). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.
