- EPA's UCMR 5 testing looked for 30 contaminants here and found 6.
- Lithium: found in 9 of 27 samples, average 9.29 µg/L, highest 42.4 µg/L (EPA UCMR 5 testing, Mar 2023–Jan 2026)
- PFOS (a PFAS): found in 7 of 28 samples, average 2.6 ppt, highest 14.2 ppt (EPA UCMR 5 testing, Mar 2023–Apr 2026)
- PFOA (a PFAS): found in 8 of 28 samples, average 1.8 ppt, highest 8.9 ppt (EPA UCMR 5 testing, Mar 2023–Apr 2026)
- PFHxS (a PFAS): found in 9 of 28 samples, average 1.8 ppt, highest 8.4 ppt (EPA UCMR 5 testing, Mar 2023–Apr 2026)
- PFPeA (a PFAS): found in 5 of 28 samples, average 0.70 ppt, highest 5.9 ppt (EPA UCMR 5 testing, Mar 2023–Apr 2026)
- PFHxA (a PFAS): found in 4 of 28 samples, average 0.50 ppt, highest 4 ppt (EPA UCMR 5 testing, Mar 2023–Apr 2026)
- Lead, 90th percentile: 0 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, 2022–Dec 31, 2024). 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 Santa Ana tap water? What EPA records show
EPA CA3010038 · serves Santa Ana, CA · about 316,184 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
City of Santa Ana (EPA CA3010038)
EPA data as of October 14, 2026. For Santa Ana's main utility, City of Santa Ana: We found no health-based violations in EPA's records for this system (CA3010038) since July 1, 2021, as of October 14, 2026. EPA's UCMR 5 testing looked for 30 contaminants here and found 6. This is public data, not a test of your tap.
What EPA records show for City of Santa Ana, as of October 14, 2026
We found no health-based violations in EPA's records for this system (CA3010038) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for City of Santa Ana (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 0 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, 2022–Dec 31, 2024). 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 6.
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 City of Santa Ana use chloramine?
We didn't find chloramine in City of Santa Ana's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.