San Tan Valley, Arizona Water Quality Report
Water quality data for 4 water systems serving 98,772 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 185.0 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 1850% | Above guideline |
| PFBA | 0.007 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFBS | 0.024 | No federal limit | 2000.0 ug/L(EPA Health Advisory) | 0% | Below guideline |
| PFHpA | 0.005 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxA | 0.022 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFOA | 0.019 | 0.004 ug/L | 0.090 ug/L(EWG) | 475% | Above limit |
| PFPeA | 0.040 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
Recommended Water Filters
Based on the contaminants detected in your water supply, these filtration systems are recommended:
Reverse Osmosis (RO)
Reverse osmosis systems remove up to 99% of PFAS compounds. Recommended for homes with detected PFAS.
Up to 99% PFAS removal
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Compliance & Violations
Active Violations (2)
71
Jul 1, 2025
66
Jan 1, 2023
Resolved Violations (498)
03
Jul 1, 2025 — Sep 30, 2025
27
Mar 1, 2025 — Mar 31, 2025
27
Mar 1, 2025 — Mar 31, 2025
27
Feb 1, 2025 — Feb 28, 2025
27
Feb 1, 2025 — Feb 28, 2025
+ 493 more resolved violations
Frequently Asked Questions
Is San Tan Valley tap water safe to drink?
San Tan Valley's water has 1 contaminant detected above EPA limits. While the water is treated, residents may want to consider additional filtration.
What contaminants are in San Tan Valley tap water?
7 contaminants have been detected in San Tan Valley's water supply across 4 water systems. See the full contaminant table above for details.
How can I improve my water quality in San Tan Valley?
Install a water filter rated for the specific contaminants found in San Tan Valley's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does San Tan Valley have any water quality violations?
Yes, San Tan Valley currently has 32 active violations. See the violations section above for details.