A95/100
HILLSBORO, CITY OF — Water Quality Report 2026
Serving 92,632 people · Oregon
Water Source
Purchased Surface Water
County
—
System ID
OR4101513
Violations
5
Contaminant Test Results
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2025 – July 8, 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 HILLSBORO, CITY OF
Is HILLSBORO, CITY OF water safe to drink?
HILLSBORO, CITY OF water receives a grade of A (95/100), which is considered excellent. Out of 69 contaminants tested, none exceed EPA legal limits. The water meets federal safety standards.
What contaminants has HILLSBORO, CITY OF detected?
69 contaminants were tested in HILLSBORO, CITY OF's water. No contaminants exceed EPA legal limits or health goals, indicating good water quality management.
Does HILLSBORO, CITY OF have any EPA violations?
Yes, HILLSBORO, CITY OF has 5 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MON, MR.
How many people does HILLSBORO, CITY OF serve?
HILLSBORO, CITY OF serves approximately 92,632 people, Oregon.
What type of water does HILLSBORO, CITY OF provide?
HILLSBORO, 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 OR4101513.
How does HILLSBORO, CITY OF compare to other utilities in Oregon?
HILLSBORO, CITY OF scores 95/100 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.