- EPA's UCMR 5 testing looked for 30 contaminants here and found 7.
- Lithium: found in 20 of 20 samples, average 221 µg/L, highest 353 µg/L (EPA UCMR 5 testing, Aug 2024–Feb 2025)
- PFBS (a PFAS): found in 6 of 20 samples, average 18.8 ppt, highest 91.1 ppt (EPA UCMR 5 testing, Aug 2024–Feb 2025)
- PFPeA (a PFAS): found in 5 of 20 samples, average 4.2 ppt, highest 20.8 ppt (EPA UCMR 5 testing, Aug 2024–Feb 2025)
- PFBA (a PFAS): found in 4 of 20 samples, average 3.9 ppt, highest 19.9 ppt (EPA UCMR 5 testing, Aug 2024–Feb 2025)
- PFHxA (a PFAS): found in 5 of 20 samples, average 3.7 ppt, highest 18.6 ppt (EPA UCMR 5 testing, Aug 2024–Feb 2025)
- PFHpA (a PFAS): found in 4 of 20 samples, average 1.7 ppt, highest 9.4 ppt (EPA UCMR 5 testing, Aug 2024–Feb 2025)
- PFHxS (a PFAS): found in 4 of 20 samples, average 1.2 ppt, highest 6.1 ppt (EPA UCMR 5 testing, Aug 2024–Feb 2025)
- 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 Casa Grande tap water? What EPA records show
EPA AZ0411009 · serves Casa Grande, AZ · about 134,432 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
Arizona Water CO - Pinal Valley (EPA AZ0411009)
EPA data as of October 14, 2026. For Casa Grande's main utility, Arizona Water CO - Pinal Valley: We found no health-based violations in EPA's records for this system (AZ0411009) 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 Arizona Water CO - Pinal Valley, as of October 14, 2026
We found no health-based violations in EPA's records for this system (AZ0411009) since July 1, 2021, as of October 14, 2026.
Source: EPA ECHO record for Arizona Water CO - Pinal Valley (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 7.
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 Arizona Water CO - Pinal Valley use chloramine?
We didn't find chloramine in Arizona Water CO - Pinal Valley's EPA treatment records. That's not a complete list; your utility's annual water quality report says which disinfectant it uses.