- EPA's UCMR 5 testing looked for 30 contaminants here and found 7.
- Lithium: found in 1 of 30 samples, average 0.31 µg/L, highest 9.3 µg/L (EPA UCMR 5 testing, Aug 2023–May 2024)
- PFOS (a PFAS): found in 2 of 30 samples, average 1 ppt, highest 18 ppt (EPA UCMR 5 testing, Aug 2023–May 2024)
- PFHxS (a PFAS): found in 2 of 30 samples, average 0.50 ppt, highest 7.9 ppt (EPA UCMR 5 testing, Aug 2023–May 2024)
- PFOA (a PFAS): found in 2 of 30 samples, average 0.40 ppt, highest 7.1 ppt (EPA UCMR 5 testing, Aug 2023–May 2024)
- PFPeA (a PFAS): found in 2 of 30 samples, average 0.30 ppt, highest 4.4 ppt (EPA UCMR 5 testing, Aug 2023–May 2024)
- PFHxA (a PFAS): found in 2 of 30 samples, average 0.20 ppt, highest 4.1 ppt (EPA UCMR 5 testing, Aug 2023–May 2024)
- PFBS (a PFAS): found in 2 of 30 samples, average 0.20 ppt, highest 3.2 ppt (EPA UCMR 5 testing, Aug 2023–May 2024)
- Lead, 90th percentile: 2.1 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 Pomona tap water? What EPA records show
EPA CA1910126 · serves Pomona, CA · about 151,713 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
Pomona - City, Water Dept. (EPA CA1910126)
EPA data as of October 14, 2026. For Pomona's main utility, Pomona - City, Water Dept.: We found no health-based violations in EPA's records for this system (CA1910126) since July 1, 2021, as of October 14, 2026. EPA's UCMR 5 testing looked for 30 contaminants here and found 7. This is public data, not a test of your tap.
What EPA records show for Pomona - City, Water Dept., as of October 14, 2026
We found no health-based violations in EPA's records for this system (CA1910126) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Pomona - City, Water Dept. (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 2.1 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 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 Pomona - City, Water Dept. use chloramine?
We didn't find chloramine in Pomona - City, Water Dept.'s EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.