A91/100
ARLINGTON CITY OF — Water Quality Report 2026
Serving 20,418 people · Washington
Water Source
Purchased Surface Water
County
—
System ID
WA5302950
Violations
1
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 2.80 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 1979.
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 ARLINGTON CITY OF
Is ARLINGTON CITY OF water safe to drink?
ARLINGTON CITY OF water receives a grade of A (91/100), which is considered excellent. Out of 70 contaminants tested, 1 exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has ARLINGTON CITY OF detected?
70 contaminants were tested in ARLINGTON CITY OF's water. Notable contaminants include Copper (90th percentile). 1 exceed EPA legal limits (MCLs). 1 exceed EPA health goals (MCLGs).
Does ARLINGTON CITY OF have any EPA violations?
Yes, ARLINGTON CITY OF has 1 EPA violation(s) on record, with the most recent in 1979. Violation types include MR.
How many people does ARLINGTON CITY OF serve?
ARLINGTON CITY OF serves approximately 20,418 people, Washington.
What type of water does ARLINGTON CITY OF provide?
ARLINGTON CITY OF sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is WA5302950.
How does ARLINGTON CITY OF compare to other utilities in Washington?
ARLINGTON CITY OF scores 91/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Washington state page for a full comparison of water systems.