Is there PFAS in Cal Am - Suburban Rosemont water?

Yes. EPA's final UCMR 5 results show Cal Am - Suburban Rosemont averaged 11.9 ppt of PFOS at its worst sampling point, 3.0 times the EPA limit of 4 ppt.

Cal Am - Suburban Rosemont is a public water system drawing on surface water, based in Sacramento, California, serving about 54,793 people, including Carmichael, Mather, Rancho Cordova, Sacramento. Under EPA's Fifth Unregulated Contaminant Monitoring Rule it was tested for 29 PFAS and lithium 42 times across 20 sampling points between Mar 2023 and Nov 2024.

Every PFAS detected

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

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 California

• City of Lincoln 2 PFAS detected
• Gswc - Bell, Bell Gardens above an EPA limit
• City of Ceres above an EPA limit
• City of Rialto 7 PFAS detected
• Paramount - City, Water Dept. none detected
• Monte Vista Cwd above an EPA limit

All 707 tested systems in California

ZIP codes served

95608 95655 95670 95826 95827 95829

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 Cal Am - Suburban Rosemont water: EPA UCMR 5 results." Data: U.S. EPA Fifth Unregulated Contaminant Monitoring Rule, final release August 2026, PWSID CA3410010. https://wellandtap.com/pfas/california/cal-am-suburban-rosemont/

About this data

Source: U.S. EPA, UCMR 5 occurrence data, final release August 2026 (PWSID CA3410010). Population: EPA SDWIS. Averages count results below the reporting level as zero, the same convention EPA uses for running annual averages. Full method.