- EPA's UCMR 5 testing looked for 30 contaminants here and found 4.
- Lithium: found in 70 of 70 samples, average 137 µg/L, highest 525 µg/L (EPA UCMR 5 testing, Feb 2023–Nov 2025)
- PFBS (a PFAS): found in 10 of 70 samples, average 1.4 ppt, highest 15.2 ppt (EPA UCMR 5 testing, Feb 2023–Nov 2025)
- PFHxS (a PFAS): found in 4 of 70 samples, average 0.50 ppt, highest 9.3 ppt (EPA UCMR 5 testing, Feb 2023–Nov 2025)
- PFHxA (a PFAS): found in 1 of 70 samples, average 0.0 ppt, highest 3.2 ppt (EPA UCMR 5 testing, Feb 2023–Nov 2025)
- Lead, 90th percentile: 5.01 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 Mesa tap water? What EPA records show
EPA AZ0407095 · serves Mesa, AZ · about 466,000 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
Mesa City of (EPA AZ0407095)
EPA data as of October 14, 2026. For Mesa's main utility, Mesa City of: We found no health-based violations in EPA's records for this system (AZ0407095) since July 1, 2021, as of October 14, 2026. PFOA and PFOS were not detected at or above EPA's reporting level in EPA's UCMR 5 testing.
What EPA records show for Mesa City of, as of October 14, 2026
We found no health-based violations in EPA's records for this system (AZ0407095) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Mesa City of (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 5.01 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 4.
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 Mesa City of use chloramine?
We didn't find chloramine in Mesa City of's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.