A90/100
TUALATIN, CITY OF — Water Quality Report 2026
Serving 28,106 people · Oregon
Water Source
Purchased Surface Water
County
—
System ID
OR4100906
Violations
7
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.005 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (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: June 1, 2024 – June 30, 2024Rule: Total Coliform 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 TUALATIN, CITY OF
Is TUALATIN, CITY OF water safe to drink?
TUALATIN, CITY OF water receives a grade of A (90/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has TUALATIN, CITY OF detected?
69 contaminants were tested in TUALATIN, CITY OF's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does TUALATIN, CITY OF have any EPA violations?
Yes, TUALATIN, CITY OF has 7 EPA violation(s) on record, with the most recent in 2024. Violation types include MON, MR.
How many people does TUALATIN, CITY OF serve?
TUALATIN, CITY OF serves approximately 28,106 people, Oregon.
What type of water does TUALATIN, CITY OF provide?
TUALATIN, 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 OR4100906.
How does TUALATIN, CITY OF compare to other utilities in Oregon?
TUALATIN, CITY OF scores 90/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Oregon state page for a full comparison of water systems.