B75/100
Oak Harber Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 2,288 residents · Ohio
What's In Oak Harber's Tap Water?
5
Contaminants Tested
1
Exceed EPA Limits
0
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 665.00 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
2
Violations (last 5yr)
1
Unresolved
0
Health-Related
TIER 3Unresolved
Surface water treatment technique failure
TIER 3Resolved
Surface water treatment technique failure
When: October 26, 2022 – November 23, 2022Enforcement: 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
CARROLL WATER AND SEWER
Population Served
2,288
Water Source
Surface Water
System ID
OH6205111
Frequently Asked Questions About Oak Harber Water
Is Oak Harber tap water safe to drink?
Oak Harber, Ohio tap water receives a grade of B (75/100), which is considered good. Out of 5 contaminants tested, 1 exceed EPA maximum contaminant levels (MCLs) and 1 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 Oak Harber's water?
Of the 5 contaminants tested in Oak Harber's water supply, the most notable include Copper (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Oak Harber have any water quality violations?
Yes, Oak Harber has 9 EPA violation(s) on record, with the most recent in 2024. 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 Oak Harber?
Based on EPA data, using a water filter in Oak Harber 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 Oak Harber's tap water come from?
Oak Harber's drinking water is sourced from surface water and supplied by CARROLL WATER AND SEWER. The system serves approximately 2,288 people. Surface water sources include rivers, lakes, and reservoirs.
How often is Oak Harber'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. Oak Harber'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 Oak Harber's water compare to other cities in Ohio?
Oak Harber's water quality score of 75/100 earns a grade of B, which is considered good. This is an above-average score compared to many cities nationwide. Visit our Ohio state page to see how all cities in the state compare.
What should I do if I'm concerned about Oak Harber's water quality?
If you have concerns about Oak Harber'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 (CARROLL WATER AND SEWER) 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.