What EPA records show for Cal-Water Service Co.-Chico
EPA system ID CA0410002 · serves Butte County, CA · about 110,473 people (EPA records)
Here's what EPA has on file for this water system: its testing for newer contaminants like PFAS (UCMR 5), lead testing and violations. It's not a test of your tap, and there's no Water Score here.
Public EPA test results
Cal-Water Service Co.-Chico (EPA CA0410002)
What EPA records show for Cal-Water Service Co.-Chico, as of October 14, 2026
We found no health-standard violations in EPA's records for this system (CA0410002) since July 1, 2021, as of October 14, 2026.
Lead: 9 in 10 homes tested came in at or below 0 ppb, at or below EPA's 15 ppb action level (latest EPA result for a testing period that ran on or after July 1, 2021: Jan 1, 2024–Dec 31, 2026). This is one number for the whole water system, from homes the utility tested. It isn't a result for your home.
EPA's UCMR 5 testing looked for 30 contaminants here and found 7.
Source: EPA records (SDWIS, UCMR 5). SDWIS: data as of Oct 14, 2026. EPA UCMR 5 data, samples through June 2026.
Your water bill names your utility.
Does Cal-Water Service Co.-Chico use chloramine?
We didn't find chloramine in Cal-Water Service Co.-Chico's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.
Reported results in EPA records (data as of Oct 14–15, 2026)
EPA's UCMR 5 testing looked for 30 contaminants here and found 7.
Lithium: found in 3 of 74 samples, average 0.42 µg/L, highest 11.7 µg/L (EPA UCMR 5 testing, Sep 2023–Jul 2024)
PFHxS (a PFAS): found in 19 of 74 samples, average 2.2 ppt, highest 22.1 ppt (EPA UCMR 5 testing, Sep 2023–Jul 2024)
PFOS (a PFAS): found in 15 of 74 samples, average 2 ppt, highest 22.5 ppt (EPA UCMR 5 testing, Sep 2023–Jul 2024)
PFBS (a PFAS): found in 6 of 74 samples, average 0.40 ppt, highest 9.6 ppt (EPA UCMR 5 testing, Sep 2023–Jul 2024)
PFOA (a PFAS): found in 2 of 74 samples, average 0.20 ppt, highest 6.8 ppt (EPA UCMR 5 testing, Sep 2023–Jul 2024)
PFHxA (a PFAS): found in 2 of 74 samples, average 0.10 ppt, highest 6 ppt (EPA UCMR 5 testing, Sep 2023–Jul 2024)
PFPeA (a PFAS): found in 2 of 74 samples, average 0.10 ppt, highest 5.3 ppt (EPA UCMR 5 testing, Sep 2023–Jul 2024)
Lead: 9 in 10 homes tested came in at or below 0 ppb, at or below EPA's 15 ppb action level (latest EPA result for a testing period that ran on or after July 1, 2021: Jan 1, 2024–Dec 31, 2026). This is one number for the whole water system, from homes the utility tested. It isn't a result for your home.
Source: EPA SDWIS (ECHO SDWA bulk download), data as of Oct 14, 2026
Source: EPA UCMR 5 occurrence data, data as of Oct 15, 2026
These are EPA's public records for this water system, shown as of October 14, 2026. If you represent this utility, or think a record here is wrong, tell us: Report an error. If the error is in EPA's own records, your state drinking water program can correct it there, and this page updates at our next data refresh.
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