C46/100
WILSONVILLE, CITY OF — Water Quality Report 2026
Serving 25,915 people · Oregon
Water Source
Surface Water
County
—
System ID
OR4100954
Violations
27
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.008 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2025 – September 23, 2025Enforcement: 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 WILSONVILLE, CITY OF
Is WILSONVILLE, CITY OF water safe to drink?
WILSONVILLE, CITY OF water receives a grade of C (46/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 27 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has WILSONVILLE, CITY OF detected?
76 contaminants were tested in WILSONVILLE, CITY OF's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does WILSONVILLE, CITY OF have any EPA violations?
Yes, WILSONVILLE, CITY OF has 27 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MR, MON. 6 are health-based violations.
How many people does WILSONVILLE, CITY OF serve?
WILSONVILLE, CITY OF serves approximately 25,915 people, Oregon.
What type of water does WILSONVILLE, CITY OF provide?
WILSONVILLE, 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 OR4100954.
How does WILSONVILLE, CITY OF compare to other utilities in Oregon?
WILSONVILLE, CITY OF scores 46/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Oregon state page for a full comparison of water systems.