C42/100
Monroe Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 15,600 residents · Ohio
What's In Monroe's Tap Water?
70
Contaminants Tested
1
Exceed EPA Limits
2
Above EPA Goals
3 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 50.00 mg/L | 1.30 mg/L | Over Limit |
1,4-dioxane | 0.370 µg/L | — | Above Goal |
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
6
Violations (last 5yr)
1
Unresolved
0
Health-Related
TIER 3Resolved
Disinfection byproduct treatment technique failure
When: May 14, 2025 – May 30, 2025Rule: Ground Water RuleEnforcement: 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, 2024 – March 31, 2024Rule: 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, 2024 – March 31, 2024Rule: 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: April 1, 2022 – June 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: April 1, 2022 – June 30, 2022Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Unresolved
Surface water treatment technique failure
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
MONROE CITY PWS
Population Served
15,600
Water Source
Purchased Surface Water
System ID
OH0902012
Frequently Asked Questions About Monroe Water
Is Monroe tap water safe to drink?
Monroe, Ohio tap water receives a grade of C (42/100), which is considered fair. 1 contaminant(s) exceed EPA maximum contaminant levels and 36 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Monroe's water?
Of the 70 contaminants tested in Monroe's water supply, the most notable include Copper (90th percentile), Lead (90th percentile), 1,4-dioxane. 1 contaminant(s) exceed EPA legal limits (MCLs). 3 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Monroe have any water quality violations?
Yes, Monroe has 36 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, MR, MCL. 2 of these are health-based violations, which are the most serious category.
Do I need a water filter in Monroe?
Based on EPA data, using a water filter in Monroe 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 Monroe's tap water come from?
Monroe's drinking water is sourced from purchased surface water and supplied by MONROE CITY PWS. The system serves approximately 15,600 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Monroe'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. Monroe'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 Monroe's water compare to other cities in Ohio?
Monroe's water quality score of 42/100 earns a grade of C, which is considered fair. This is a below-average score that indicates room for improvement. Visit our Ohio state page to see how all cities in the state compare.
What should I do if I'm concerned about Monroe's water quality?
If you have concerns about Monroe'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 (MONROE CITY PWS) 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.