C50/100
TUMWATER CITY OF — Water Quality Report 2026
Serving 66,373 people · Washington
Water Source
Groundwater
County
—
System ID
WA5389700
Violations
15
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 3.00 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.008 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2020.
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 TUMWATER CITY OF
Is TUMWATER CITY OF water safe to drink?
TUMWATER CITY OF water receives a grade of C (50/100), which is considered fair. 1 contaminant(s) exceed EPA legal limits and 15 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has TUMWATER CITY OF detected?
67 contaminants were tested in TUMWATER CITY OF's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does TUMWATER CITY OF have any EPA violations?
Yes, TUMWATER CITY OF has 15 EPA violation(s) on record, with the most recent in 2020. Violation types include MON, MR, MCL. 6 are health-based violations.
How many people does TUMWATER CITY OF serve?
TUMWATER CITY OF serves approximately 66,373 people, Washington.
What type of water does TUMWATER CITY OF provide?
TUMWATER CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is WA5389700.
How does TUMWATER CITY OF compare to other utilities in Washington?
TUMWATER CITY OF scores 50/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Washington state page for a full comparison of water systems.