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F0/100

HERMISTON, CITY OF — Water Quality Report 2026

Serving 20,000 people · Oregon

Water Source
Surface Water
County
—
System ID
OR4100372
Violations
132

Contaminant Test Results

3 contaminants above EPA health goals
ContaminantDetectedLimit (MCL)Status
PFOS
0.012 µg/L0.004 µg/LOver Limit
PFHxS
0.012 µg/L0.010 µg/LOver Limit
Lead (90th percentile)
0.003 mg/L0.015 mg/LAbove Goal

EPA Violation History

6

Violations (last 5yr)

0

Unresolved

0

Health-Related

TIER 3Resolved

Monitoring Violation

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: February 1, 2025 – February 28, 2025Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2023 – September 30, 2023Enforcement: Resolving — corrective action underway
TIER 3Resolved

Monitoring / Reporting Violation

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: September 1, 2022 – September 30, 2022Rule: Consumer Confidence RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Monitoring / Reporting Violation

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: September 1, 2022 – September 30, 2022Rule: Consumer Confidence RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Monitoring / Reporting Violation

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2022 – July 31, 2022Rule: Consumer Confidence RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Monitoring / Reporting Violation

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2022 – July 31, 2022Rule: Consumer Confidence RuleEnforcement: Resolving — corrective action underway

Understanding violation severity

Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.

Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly

Frequently Asked Questions About HERMISTON, CITY OF

Is HERMISTON, CITY OF water safe to drink?

HERMISTON, CITY OF water receives a grade of F (0/100), which is considered failing. 2 contaminant(s) exceed EPA legal limits and 132 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has HERMISTON, CITY OF detected?

69 contaminants were tested in HERMISTON, CITY OF's water. Notable contaminants include PFOS, PFHxS, Lead (90th percentile). 2 exceed EPA legal limits (MCLs). 3 exceed EPA health goals (MCLGs).

Does HERMISTON, CITY OF have any EPA violations?

Yes, HERMISTON, CITY OF has 132 EPA violation(s) on record, with the most recent in 2025. Violation types include MON, MR, TT. 8 are health-based violations.

How many people does HERMISTON, CITY OF serve?

HERMISTON, CITY OF serves approximately 20,000 people, Oregon.

What type of water does HERMISTON, CITY OF provide?

HERMISTON, CITY OF sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is OR4100372.

How does HERMISTON, CITY OF compare to other utilities in Oregon?

HERMISTON, CITY OF scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Oregon state page for a full comparison of water systems.