- EPA's UCMR 5 testing looked for 30 contaminants here and found 4.
- Lithium: found in 4 of 8 samples, average 14 µg/L, highest 37 µg/L (EPA UCMR 5 testing, Aug 2023–Feb 2025)
- PFOA (a PFAS): found in 2 of 8 samples, average 1.3 ppt, highest 5.5 ppt (EPA UCMR 5 testing, Aug 2023–Feb 2025)
- PFOS (a PFAS): found in 2 of 8 samples, average 1.2 ppt, highest 5.7 ppt (EPA UCMR 5 testing, Aug 2023–Feb 2025)
- PFHxS (a PFAS): found in 2 of 8 samples, average 0.90 ppt, highest 4.1 ppt (EPA UCMR 5 testing, Aug 2023–Feb 2025)
- Lead, 90th percentile: 1.5 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, 2023–Dec 31, 2025). 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
Can you drink Murrieta tap water? What EPA records show
EPA CA3310036 · serves Riverside County, CA · about 17,837 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
Western MWD - Murrieta Division (EPA CA3310036)
EPA data as of October 14, 2026. For Murrieta's main utility, Western MWD - Murrieta Division: We found no health-based violations in EPA's records for this system (CA3310036) since July 1, 2021, as of October 14, 2026. EPA's UCMR 5 testing looked for 30 contaminants here and found 4. This is public data, not a test of your tap.
What EPA records show for Western MWD - Murrieta Division, as of October 14, 2026
We found no health-based violations in EPA's records for this system (CA3310036) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Western MWD - Murrieta Division (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 1.5 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, 2023–Dec 31, 2025). 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 4.
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 Western MWD - Murrieta Division use chloramine?
EPA treatment records (state-reported) list chloramines for Western MWD - Murrieta Division. EPA record