- EPA's UCMR 5 testing looked for 30 contaminants here and found 10.
- Lithium: found in 24 of 24 samples, average 151 µg/L, highest 278 µg/L (EPA UCMR 5 testing, Jul 2023–Mar 2025)
- PFOS (a PFAS): found in 10 of 24 samples, average 9.9 ppt, highest 55.8 ppt (EPA UCMR 5 testing, Jul 2023–Mar 2025) PFOA or PFOS averaged above 4.0 ppt in UCMR 5 testing
- PFHxS (a PFAS): found in 8 of 24 samples, average 7.7 ppt, highest 70.5 ppt (EPA UCMR 5 testing, Jul 2023–Mar 2025)
- PFBS (a PFAS): found in 16 of 24 samples, average 6.7 ppt, highest 25.7 ppt (EPA UCMR 5 testing, Jul 2023–Mar 2025)
- PFOA (a PFAS): found in 8 of 24 samples, average 5.2 ppt, highest 38.7 ppt (EPA UCMR 5 testing, Jul 2023–Mar 2025) PFOA or PFOS averaged above 4.0 ppt in UCMR 5 testing
- PFHxA (a PFAS): found in 6 of 24 samples, average 3.1 ppt, highest 22.5 ppt (EPA UCMR 5 testing, Jul 2023–Mar 2025)
- PFPeA (a PFAS): found in 6 of 24 samples, average 2.3 ppt, highest 14.4 ppt (EPA UCMR 5 testing, Jul 2023–Mar 2025)
- PFBA (a PFAS): found in 3 of 24 samples, average 1.1 ppt, highest 9.9 ppt (EPA UCMR 5 testing, Jul 2023–Mar 2025)
- PFHpA (a PFAS): found in 4 of 24 samples, average 1 ppt, highest 7 ppt (EPA UCMR 5 testing, Jul 2023–Mar 2025)
- PFPeS (a PFAS): found in 2 of 24 samples, average 0.60 ppt, highest 8 ppt (EPA UCMR 5 testing, Jul 2023–Mar 2025)
- Lead, 90th percentile: 4.4 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 Tempe tap water? What EPA records show
EPA AZ0407100 · serves Tempe, AZ · about 165,000 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
Tempe City of (EPA AZ0407100)
EPA data as of October 14, 2026. For Tempe's main utility, Tempe City of: We found no health-based violations in EPA's records for this system (AZ0407100) since July 1, 2021, as of October 14, 2026. This water system averaged above 4.0 ppt for PFOA or PFOS in EPA's UCMR 5 testing.
What EPA records show for Tempe City of, as of October 14, 2026
We found no health-based violations in EPA's records for this system (AZ0407100) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Tempe City of (SDWIS). Data as of October 14, 2026.
Lead, 90th percentile: 4.4 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.
This water system averaged above 4.0 ppt for PFOA or PFOS in EPA's UCMR 5 testing.
EPA's UCMR 5 testing looked for 30 contaminants here and found 10.
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 Tempe City of use chloramine?
We didn't find chloramine in Tempe City of's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.