Fresno, California Water Quality Report
Water quality data for 74 water systems serving 630,802 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| PFBA | 0.026 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFBS | 0.013 | No federal limit | 2000.0 ug/L(EPA Health Advisory) | 0% | Below guideline |
| PFHpA | 0.031 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxA | 0.034 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxS | 0.030 | 0.010 ug/L | 0.001 ug/L(EWG) | 300% | Above limit |
| PFNA | 0.008 | 0.010 ug/L | — | 80% | Within limit |
| PFOA | 0.016 | 0.004 ug/L | 0.090 ug/L(EWG) | 400% | Above limit |
| PFOS | 0.030 | 0.004 ug/L | 0.300 ug/L(EWG) | 750% | Above limit |
| PFPeA | 0.047 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFPeS | 0.005 | No federal limit | — | — | No federal limit |
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 (26)
4G
Oct 17, 2024
4G
Oct 17, 2024
2E
Oct 17, 2024
4G
Oct 17, 2024
2E
Oct 17, 2024
2E
Oct 17, 2024
2E
Oct 17, 2024
2E
Oct 17, 2024
4G
Oct 17, 2024
2E
Oct 17, 2024
2E
Oct 17, 2024
4G
Oct 17, 2024
4G
Oct 17, 2024
2E
Oct 17, 2024
4G
Oct 17, 2024
4G
Oct 17, 2024
52
Oct 1, 2024
71
Jul 1, 2024
52
Oct 1, 2019
52
Oct 1, 2019
71
Jul 1, 2019
71
Jul 1, 2019
52
Oct 1, 2018
71
Jul 1, 2018
71
Jul 1, 2018
71
Jul 1, 2018
Resolved Violations (626)
01
Jul 1, 2025 — Sep 30, 2025
02
Apr 1, 2025 — Jun 30, 2025
02
Jan 1, 2025 — Mar 31, 2025
02
Oct 1, 2024 — Dec 31, 2024
02
Jul 1, 2024 — Sep 30, 2024
+ 621 more resolved violations
Frequently Asked Questions
Is Fresno tap water safe to drink?
Fresno's water has 3 contaminants detected above EPA limits. While the water is treated, residents may want to consider additional filtration.
What contaminants are in Fresno tap water?
10 contaminants have been detected in Fresno's water supply across 74 water systems. See the full contaminant table above for details.
How can I improve my water quality in Fresno?
Install a water filter rated for the specific contaminants found in Fresno's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Fresno have any water quality violations?
Yes, Fresno currently has 121 active violations. See the violations section above for details.