- EPA's UCMR 5 testing looked for 30 contaminants here and found 4.
- Lithium: found in 13 of 16 samples, average 15.4 µg/L, highest 39 µg/L (EPA UCMR 5 testing, Apr 2024–Oct 2024)
- PFHxS (a PFAS): found in 2 of 16 samples, average 0.60 ppt, highest 5.7 ppt (EPA UCMR 5 testing, Apr 2024–Oct 2024)
- 6:2 FTS (a PFAS): found in 1 of 16 samples, average 0.40 ppt, highest 7.1 ppt (EPA UCMR 5 testing, Apr 2024–Oct 2024)
- PFOS (a PFAS): found in 1 of 16 samples, average 0.30 ppt, highest 4.5 ppt (EPA UCMR 5 testing, Apr 2024–Oct 2024)
- 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, 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 Rohnert Park tap water? What EPA records show
EPA CA4910014 · serves Rohnert Park, CA · about 43,821 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
Rohnert Park, City of (EPA CA4910014)
EPA data as of October 14, 2026. For Rohnert Park's main utility, Rohnert Park, City of: We found no health-based violations in EPA's records for this system (CA4910014) 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 Rohnert Park, City of, as of October 14, 2026
We found no health-based violations in EPA's records for this system (CA4910014) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Rohnert Park, City of (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, 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 Rohnert Park, City of use chloramine?
We didn't find chloramine in Rohnert Park, City of's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.