TapSafetyReport
D26/100

Monmouth Tap Water Quality: Is It Safe to Drink? (2026 Report)

Serving 14,389 residents · Oregon

What's In Monmouth's Tap Water?

42
Contaminants Tested
1
Exceed EPA Limits
0
Above EPA Goals
1 contaminant above EPA health goals
ContaminantDetectedLimit (MCL)Status
Copper (90th percentile)
2.58 mg/L1.30 mg/LOver Limit

EPA Violation History

6

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: January 1, 2023 – March 31, 2023Rule: 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: January 1, 2023 – March 31, 2023Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Failed to complete routine monitoring

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: August 1, 2021 – August 31, 2021Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Violation related to Coliform (pre-2016 TCR)

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: August 1, 2021 – August 31, 2021Rule: Surface Water Treatment RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Monitoring Violation

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: August 1, 2021 – August 31, 2021Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Consumer confidence report — inadequate or unavailable

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2021 – October 7, 2021Rule: Ground Water 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

Water Utility Details

MONMOUTH, CITY OF
Population Served

11,651

Water Source

Groundwater Under Influence of Surface Water

System ID

OR4100537

LUCKIAMUTE DOMESTIC WATER COOP
Population Served

2,738

Water Source

Purchased Surface Water

System ID

OR4100538

Frequently Asked Questions About Monmouth Water

Is Monmouth tap water safe to drink?

Monmouth, Oregon tap water receives a grade of D (26/100), which is considered poor. 1 contaminant(s) exceed EPA maximum contaminant levels and 85 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.

What contaminants are in Monmouth's water?

Of the 42 contaminants tested in Monmouth'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 Monmouth have any water quality violations?

Yes, Monmouth has 85 EPA violation(s) on record, with the most recent in 2023. Violation types include MR, Other, MON. 18 of these are health-based violations, which are the most serious category.

Do I need a water filter in Monmouth?

Based on EPA data, using a water filter in Monmouth 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 Monmouth's tap water come from?

Monmouth's drinking water is sourced from groundwater under influence of surface water and supplied by MONMOUTH, CITY OF and 1 other water system(s). The system serves approximately 14,389 people. Surface water sources include rivers, lakes, and reservoirs.

How often is Monmouth'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. Monmouth'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 Monmouth's water compare to other cities in Oregon?

Monmouth's water quality score of 26/100 earns a grade of D, which is considered poor. This is a concerning score that suggests significant water quality issues. Visit our Oregon state page to see how all cities in the state compare.

What should I do if I'm concerned about Monmouth's water quality?

If you have concerns about Monmouth'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 (MONMOUTH, 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.

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