Is Oak Harber, OH Tap Water Safe to Drink?
Graded B+ — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
84.2/100
waterverge.com Oak Harber, OH — Water Quality Report
Oak Harber's drinking water received a grade of B+ (84.2 out of 100), indicating good water quality. The city's 1 water system serves approximately 2,288 residents using surface water.
Lead levels were measured at 0.0 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 9 violations on record, including 2 health-based violations. 2 remain unresolved.
What to know about Oak Harber's water
Oak Harber ranks #158 out of 511 cities in Ohio for water quality, placing it mid-range in the state.
The city draws from surface water sources, which are more susceptible to seasonal runoff and agricultural contamination, requiring extensive multi-barrier treatment including coagulation, filtration, and disinfection.
As a small community water system, Oak Harber may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Oak Harber, OH water safe to drink?
Oak Harber's tap water meets most EPA standards but has areas that warrant attention. With a grade of B+ (84.2/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 2,288 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Oak Harber
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Oak Harber's water quality assessment. Grade: B+ (84.2/100).
Contaminants: Consumer Confidence Rule.
Contaminants: Consumer Confidence Rule.
Contaminants: E. COLI.
Key contaminant findings
Based on the most recent EPA sampling data for Oak Harber's water supply.
Well within EPA limits.
Exceeds EPA action level. Copper can leach from household plumbing — flush taps for 30 seconds before drinking.
Violation history
Oak Harber's water system has 9 total violations on record, including 2 health-based violations. 2 remain unresolved. 2 violations were issued in the last 5 years.
Where does Oak Harber's water come from?
Oak Harber's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 1 water system serving approximately 2,288 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment.
What Oak Harber residents can do
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Recommended water filters
Based on contaminants detected in Oak Harber's water supply, we recommend the following filter types.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 0.0 | 15 | ppb | Inorganic | Safe |
| Copper (90th percentile) CopperInorganic A metal that enters drinking water mainly through corrosion of copper plumbing. Small amounts are essential for health, but excess levels are harmful. Health EffectsGastrointestinal distress (nausea, vomiting, diarrhea) at short-term high levels; liver and kidney damage from long-term exposure. EPA Limit1.3 mg/L action level Common SourcesCorrosion of copper household plumbing, erosion of natural deposits. | 665.00 | 1.3 | mg/L | Inorganic | Over Limit |
Lead level trend (90th percentile)
Copper level trend (90th percentile)
See how Oak Harber compares by contaminant
Explore where Oak Harber ranks among all Ohio cities for specific contaminants.
Water source & infrastructure
Where Oak Harber's water comes from
Oak Harber's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Surface water systems require multi-stage treatment including coagulation, sedimentation, filtration, and disinfection to meet EPA Safe Drinking Water Act standards.
These sources can be impacted by seasonal changes, stormwater runoff, upstream agriculture, and industrial discharge.
The system is operated by local government ownership and serves approximately 2,288 people through 1 water system.
Water systems serving Oak Harber
| System Name | PWSID | Population | Source |
|---|---|---|---|
| CARROLL WATER AND SEWER | OH6205111 | 2,288 | SW |
How Oak Harber compares
Full Ohio rankings →Oak Harber's score of 84.2/100 is above the average of 58/100 among major Ohio cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Ohio rankings →Learn more about your water
Guides and resources related to Oak Harber's water quality findings.
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Frequently asked questions
Is Oak Harber, OH tap water safe to drink?
Oak Harber's water quality earned a grade of B+ (84.2/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #158 out of 511 cities tested in Ohio.
What contaminants are in Oak Harber's water?
Lead was measured at 0.0 ppb (90th percentile). 9 violations are on record.
How is Oak Harber's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Oak Harber?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Oak Harber's water come from?
Oak Harber's water is sourced from Surface water. The city has 1 water system serving approximately 2,288 residents.
What health violations has Oak Harber's water system had?
Oak Harber has 2 health-based violations on record. The most recent violation was recorded in December 2024. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 2 violations remain unresolved.
How does Oak Harber's water compare to other cities?
Oak Harber ranks #158 out of 511 cities in Ohio (better than 69% of state cities) and #6047 out of 15744 cities nationally (62th percentile). The grade of B+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Oak Harber's small water system affect quality?
Oak Harber's system serves approximately 2,288 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 9 violations on record.