- EPA's UCMR 5 testing looked for 30 contaminants here and found 1.
- Lithium: found in 8 of 8 samples, average 23.7 µg/L, highest 62.5 µg/L (EPA UCMR 5 testing, Jan 2025–Dec 2025)
- Lead, 90th percentile: 1.4 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jan 1, 2021–Dec 31, 2023). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
Public EPA test results
What EPA records show for California Water Service CO. - HERM/REDO
EPA CA1910134 · serves Los Angeles County, CA · about 100,072 people (EPA SDWIS)
This report shows EPA's federal records for this water system: UCMR 5 testing, lead testing and violations. It isn't a test of the water at your tap, and it has no Water Score.
Public EPA test results
California Water Service CO. - HERM/REDO (EPA CA1910134)
What EPA records show for California Water Service CO. - HERM/REDO, as of October 14, 2026
We found no health-based violations in EPA's records for this system (CA1910134) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for California Water Service CO. - HERM/REDO (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 1.4 ppb at the latest result in EPA records for a monitoring period that ran on or after July 1, 2021, at or below EPA's 15 ppb action level (EPA SDWIS, monitoring period Jan 1, 2021–Dec 31, 2023). The 90th percentile is a system-wide measure from homes sampled under EPA's lead rule; it isn't a result for your home.
EPA's UCMR 5 testing looked for 30 contaminants here and found 1.
PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
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 California Water Service CO. - HERM/REDO use chloramine?
EPA treatment records (state-reported) list chloramines for California Water Service CO. - HERM/REDO. EPA record
What EPA records show for this system
Reported results in EPA records (data as of Oct 14–15, 2026)