B69/100
KELSO CITY OF — Water Quality Report 2026
Serving 15,097 people · Washington
Water Source
Groundwater Under Influence of Surface Water
County
—
System ID
WA5338000
Violations
13
Contaminant Test Results
3 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 2.10 mg/L | 1.30 mg/L | Over Limit |
chlorate | 241.00 µg/L | — | Above Goal |
Lead (90th percentile) | 0.001 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2018.
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 KELSO CITY OF
Is KELSO CITY OF water safe to drink?
KELSO CITY OF water receives a grade of B (69/100), which is considered good. Out of 67 contaminants tested, 1 exceed EPA legal limits. 3 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has KELSO CITY OF detected?
67 contaminants were tested in KELSO CITY OF's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile), chlorate. 1 exceed EPA legal limits (MCLs). 3 exceed EPA health goals (MCLGs).
Does KELSO CITY OF have any EPA violations?
Yes, KELSO CITY OF has 13 EPA violation(s) on record, with the most recent in 2018. Violation types include MR, Other, TT. 1 are health-based violations.
How many people does KELSO CITY OF serve?
KELSO CITY OF serves approximately 15,097 people, Washington.
What type of water does KELSO CITY OF provide?
KELSO CITY OF sources its water from groundwater under influence of surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is WA5338000.
How does KELSO CITY OF compare to other utilities in Washington?
KELSO CITY OF scores 69/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Washington state page for a full comparison of water systems.