Is there PFAS in Southwood Water System water?

Yes. EPA's final UCMR 5 results show Southwood Water System averaged 8.9 ppt of PFOS at its worst sampling point, 2.2 times the EPA limit of 4 ppt.

Southwood Water System is a public water system drawing on surface water, based in Tacoma, Washington, serving about 64,155 people. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 50 times across 27 sampling points between Apr 2024 and Oct 2025.

Every PFAS detected

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

Lithium, tested in the same program: not detected.

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 Washington

• Silver Lake Water & Sewer District none detected
• Woodinville Water District none detected
• Sno PUD 1 - Lake Stevens none detected
• City of Lynnwood none detected
• City of Kirkland none detected
• Longview Water Department none detected

All 248 tested systems in Washington

ZIP codes served

98371 98372 98373 98374

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 Southwood Water System water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID WA5382844. https://wellandtap.com/pfas/washington/southwood-water-system/

About this data

Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID WA5382844). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.