Hermiston, Oregon Water Quality Report
Water quality data for 9 water systems serving 21,057 people.
Water Source
Detected Contaminants
| Contaminant | Detected Level | EPA Limit (MCL) | Health Guideline | % of Limit | Status |
|---|---|---|---|---|---|
| lithium | 32.0 | No federal limit | 10.0 ug/L(EPA/USGS HBSL) | 320% | Above guideline |
| PFBS | 0.010 | No federal limit | 2000.0 ug/L(EPA Health Advisory) | 0% | Below guideline |
| PFHxA | 0.004 | No federal limit | 1000.0 ug/L(EWG) | 0% | Below guideline |
| PFHxS | 0.012 | 0.010 ug/L | 0.001 ug/L(EWG) | 120% | Above limit |
| PFOS | 0.012 | 0.004 ug/L | 0.300 ug/L(EWG) | 300% | Above limit |
| PFPeA | 0.004 | 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 (1)
71
Jul 1, 2025
Resolved Violations (499)
3A
Jul 1, 2025 — Sep 30, 2025
71
Jul 1, 2025
3A
May 1, 2025 — May 31, 2025
3A
Mar 1, 2025 — Mar 31, 2025
3A
Feb 1, 2025 — Feb 28, 2025
+ 494 more resolved violations
Frequently Asked Questions
Is Hermiston tap water safe to drink?
Hermiston's water has 2 contaminants detected above EPA limits. While the water is treated, residents may want to consider additional filtration.
What contaminants are in Hermiston tap water?
6 contaminants have been detected in Hermiston's water supply across 9 water systems. See the full contaminant table above for details.
How can I improve my water quality in Hermiston?
Install a water filter rated for the specific contaminants found in Hermiston's water. See our filter recommendations above. You can also request your utility's Consumer Confidence Report for the most current test results.
Does Hermiston have any water quality violations?
Yes, Hermiston currently has 25 active violations. See the violations section above for details.