B68/100
GRESHAM, CITY OF — Water Quality Report 2026
Serving 73,932 people · Oregon
Water Source
Purchased Surface Water
County
—
System ID
OR4100357
Violations
21
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.40 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: July 1, 2022 – September 30, 2022Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: July 1, 2022 – September 30, 2022Rule: Stage 2 DBPREnforcement: 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 GRESHAM, CITY OF
Is GRESHAM, CITY OF water safe to drink?
GRESHAM, CITY OF water receives a grade of B (68/100), which is considered good. Out of 70 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has GRESHAM, CITY OF detected?
70 contaminants were tested in GRESHAM, 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 GRESHAM, CITY OF have any EPA violations?
Yes, GRESHAM, CITY OF has 21 EPA violation(s) on record, with the most recent in 2022. Violation types include MR.
How many people does GRESHAM, CITY OF serve?
GRESHAM, CITY OF serves approximately 73,932 people, Oregon.
What type of water does GRESHAM, CITY OF provide?
GRESHAM, 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 OR4100357.
How does GRESHAM, CITY OF compare to other utilities in Oregon?
GRESHAM, CITY OF scores 68/100 with a grade of B (good). This is an above-average performance for utilities statewide. Visit our Oregon state page for a full comparison of water systems.