Is there PFAS in Liberty Utilities - Lynwood water?

Yes. EPA's final UCMR 5 results show Liberty Utilities - Lynwood averaged 17.0 ppt of PFOS at its worst sampling point, 4.3 times the EPA limit of 4 ppt.

Liberty Utilities - Lynwood is a public water system drawing on surface water, based in Downey, California, serving about 24,701 people, including Compton, Lynwood. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 8 times across 3 sampling points between Feb 2024 and Nov 2024.

Every PFAS detected

Not detected: PFDoA, HFPO-DA, PFBS, 6:2 FTS, PFHpA, PFPeS, PFMBA, PFEESA, PFHpS, PFNA, NMeFOSAA, 8:2 FTS, PFDA, NFDHA, PFBA, PFPeA, PFMPA, PFTA, PFTrDA, NEtFOSAA, 4:2 FTS, ADONA, 9Cl-PF3ONS, 11Cl-PF3OUdS, PFUnA, PFHxA.

Lithium, tested in the same program: highest 88.6 ppb, detected in 4 of 8 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 California

• Cal-am Water Company - Duarte 1 PFAS detected
• City of Riverbank none detected
• City of Seal Beach none detected
• Mountain House Community Services Dist. none detected
• Sunnyslope County Water Dist above an EPA limit
• City of Patterson none detected

All 707 tested systems in California

ZIP codes served

90221 90262

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 Liberty Utilities - Lynwood water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID CA1910161. https://wellandtap.com/pfas/california/liberty-utilities-lynwood/

About this data

Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID CA1910161). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.