B70/100
Gresham Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 76,642 residents · Oregon
What's In Gresham's Tap Water?
70
Contaminants Tested
1
Exceed EPA Limits
1
Above EPA Goals
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
Water Utility Details
GRESHAM, CITY OF
Population Served
73,932
Water Source
Purchased Surface Water
System ID
OR4100357
PLEASANT HOME WATER DISTRICT
Population Served
1,510
Water Source
Purchased Surface Water
System ID
OR4100360
LUSTED WATER DISTRICT
Population Served
1,200
Water Source
Purchased Surface Water
System ID
OR4100361
Frequently Asked Questions About Gresham Water
Is Gresham tap water safe to drink?
Gresham, Oregon tap water receives a grade of B (70/100), which is considered good. Out of 70 contaminants tested, 1 exceed EPA maximum contaminant levels (MCLs) and 2 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Gresham's water?
Of the 70 contaminants tested in Gresham's water supply, the most notable include Copper (90th percentile), Lead (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 2 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Gresham have any water quality violations?
Yes, Gresham has 65 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MON, MR. None of these are classified as health-based violations.
Do I need a water filter in Gresham?
Based on EPA data, using a water filter in Gresham is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.
Where does Gresham's tap water come from?
Gresham's drinking water is sourced from purchased surface water and supplied by GRESHAM, CITY OF and 2 other water system(s). The system serves approximately 76,642 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Gresham's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. Gresham's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does Gresham's water compare to other cities in Oregon?
Gresham's water quality score of 70/100 earns a grade of B, which is considered good. This is an above-average score compared to many cities nationwide. Visit our Oregon state page to see how all cities in the state compare.
What should I do if I'm concerned about Gresham's water quality?
If you have concerns about Gresham's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (GRESHAM, CITY OF) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.