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