OH · 88 COUNTIES

Well Water & Real Estate — Ohio

Guidance for homebuyers, sellers, and real estate professionals dealing with private well properties in Ohio.

County Risk Distribution

88counties
High Risk — 78% Moderate Risk — 20% Low / Info — 2%

Free County Water Quality Reports

Every county in Ohio has a free downloadable water quality report covering contaminant data, detection rates, and risk context — useful for buyers, sellers, and agents alike.

Find Your County Report →

For Homebuyers

Before purchasing a property with a private well in Ohio, commission an independent water test. Sellers are not always required to disclose water quality issues, and visual inspection of the water tells you nothing about dissolved contaminants.

Key steps before closing

Lender requirements

FHA and VA loans require a well water test before closing if the property uses a private well. The test must be performed by a state-certified lab and must meet EPA drinking water standards for coliform bacteria and nitrate at minimum. Some lenders require a broader panel. Build testing time into your closing timeline.

Find a Testing Lab in Ohio

Higher-Risk Counties in Ohio

The following counties have elevated contaminant detection rates based on available groundwater data. Buyers purchasing in these areas should prioritize comprehensive testing and budget for potential treatment.

Adams County Chloride, Sodium High Allen County Chloride, pH High Ashland County Chloride, Sodium High Ashtabula County Chloride, Sodium High Auglaize County Iron, Chloride High Belmont County Sodium, Chloride High Butler County pH, Chloride High Carroll County Iron, Manganese High Champaign County Chloride, Sodium High Clark County Chloride, Sodium High Clinton County Chloride, Fluoride High Columbiana County Chloride, Hardness High Coshocton County Chloride, Sodium High Crawford County pH, Hardness High Cuyahoga County E. coli, pH High Darke County Sodium, Arsenic High Delaware County Chloride, Iron High Erie County Iron, Sodium High Fairfield County Sodium, Chloride High Fayette County Chloride, Iron High Franklin County Chloride, Sodium High Fulton County Chloride, Sodium High Gallia County Chloride, Sodium High Geauga County Sodium, Chloride High Greene County Chloride, Sodium High Guernsey County Chloride, Sodium High Hamilton County Chloride, pH High Hancock County Sodium, Chloride High Hardin County Sodium, Iron High Harrison County Chloride, Sodium High Highland County Chloride, Fluoride High Hocking County Iron, Sodium High Holmes County Chloride, Sodium High Jefferson County Chloride, Sodium High Knox County Sodium, Chloride High Lawrence County Chloride, Sodium High Licking County Sodium, Iron High Lorain County Chloride, Fluoride High Lucas County Chloride, Sodium High Madison County Iron, Manganese High Marion County Sodium, Iron High Medina County Chloride, Iron High Meigs County Chloride, Sodium High Mercer County Iron, Arsenic High Miami County Chloride, Hardness High Monroe County Chloride, Sodium High Montgomery County Chloride, Hardness High Morrow County Sodium, Iron High Muskingum County Chloride, Sodium High Noble County PFOA, Chloride High Ottawa County Iron, Sodium High Perry County Chloride, Sodium High Pickaway County Chloride, Sodium High Preble County Sodium, Chloride High Richland County Chloride, Sodium High Sandusky County pH, Sodium High Seneca County Sodium, Iron High Stark County Chloride, Sodium High Summit County Sodium, Iron High Trumbull County Chloride, pH High Tuscarawas County Sodium, Iron High Van Wert County Iron, Sodium High Vinton County Sodium, Chloride High Warren County Chloride, Sodium High Washington County Chloride, Sodium High Wayne County pH, Sodium High Williams County Sodium, Chloride High Wood County Sodium, pH High Wyandot County Sodium, Iron High

For Sellers

Having a current water test in hand before listing removes a common source of buyer anxiety and can prevent deals from falling through during inspection. It also demonstrates good faith transparency.

Get your well tested before listing →

For Real Estate Professionals

Every county in Ohio has a free one-page water quality factsheet available as a PDF — useful for buyer consultations, disclosures, and due diligence packets. These reports cover detected contaminants, sample counts, risk context, and recommended testing for private well properties.

Browse County Reports →

County-by-County Risk Context

Water quality varies significantly across Ohio. Browse by county to understand the specific contaminants detected and their risk levels.

Adams County High Allen County High Ashland County High Ashtabula County High Athens County Moderate Auglaize County High Belmont County High Brown County Moderate Butler County High Carroll County High Champaign County High Clark County High Clermont County Moderate Clinton County High Columbiana County High Coshocton County High Crawford County High Cuyahoga County High Darke County High Defiance County Moderate

View all 88 counties →