privatewelldata / States / Ohio
Ohio well water testing
63 labs are listed on Ohio’s official certified-lab list; 15% of 620 sampled wells were above the arsenic limit across 34 counties. Updated 2026-10-18.
Official lab list for Ohio
Ohio EPA – drinking water laboratory certificationOhio EPA certifies drinking-water labs. Its program page links to the current list of certified labs. Call a lab first to ask whether it tests private wells.epa.ohio.gov · checked 2026-10-18 (search; page returns 404 to our bot UA – recheck in browser)Ohio Environmental Protection AgencyThis state agency certifies the labs that may test drinking water. Use its list to pick a certified lab for your well sample.dam.assets.ohio.gov · checked 2026-10-18 · link via EPA
Coverage map
Where the labs are
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Tests these labs are listed for
- Bacteria (coliform / E. coli): 31 of 63 labs
- PFAS: 18 of 63 labs
- Nitrate / nitrite: 2 of 63 labs
Counted from the tests each lab is certified for on the official list. A lab may offer more; ask before you send a sample.
Well water results by county
| County | Arsenic > 10 µg/L | Nitrate > 10 mg/L |
|---|---|---|
| Allen County | – | 0% of 11 |
| Athens County | – | 6% of 18 |
| Butler County | 0% of 23 | 2% of 85 |
| Champaign County | 0% of 21 | 6% of 18 |
| Clark County | 4% of 25 | 0% of 25 |
| Coshocton County | 13% of 32 | 0% of 31 |
| Darke County | 58% of 19 | – |
| Franklin County | 13% of 60 | 2% of 117 |
| Geauga County | 16% of 31 | 0% of 75 |
| Greene County | 20% of 20 | 2% of 63 |
| Guernsey County | – | 0% of 27 |
| Hamilton County | 6% of 17 | 4% of 26 |
| Hocking County | – | 0% of 13 |
| Jefferson County | 0% of 12 | 0% of 19 |
| Licking County | 53% of 19 | 0% of 21 |
| Lucas County | 0% of 33 | 2% of 55 |
| Miami County | 14% of 21 | 0% of 40 |
| Montgomery County | 12% of 34 | 1% of 143 |
| Morgan County | – | 12% of 17 |
| Muskingum County | 21% of 28 | 3% of 36 |
| Perry County | – | 0% of 11 |
| Pickaway County | – | 0% of 13 |
| Pike County | – | 2% of 49 |
| Preble County | 44% of 39 | 0% of 41 |
| Sandusky County | – | 0% of 47 |
| Shelby County | 31% of 35 | 0% of 34 |
| Stark County | 23% of 13 | – |
| Tuscarawas County | 0% of 40 | 0% of 42 |
| Union County | 0% of 17 | 0% of 17 |
| Vinton County | – | 0% of 22 |
| Warren County | – | 0% of 13 |
| Washington County | – | 0% of 14 |
| Williams County | 15% of 13 | 0% of 27 |
| Wood County | 1% of 68 | 1% of 69 |
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Nitrate: 1% of 1,239 sampled wells statewide. All Ohio counties →
Labs on the Ohio EPA list
- American Analytical Laboratories, Inc., AkronListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Eurofins Cleveland, BarbertonListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- BSA Environmental Services, Inc., BeachwoodListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Greene County Sanitary Engineering Laboratory, BeavercreekListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Logan County Health District Laboratory, BellefontaineListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Canton City Health Department, CantonListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Canton Water Laboratory, CantonListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Eurofins Built Environment Testing East – Cary NC (formerly Eurofins CEI), CaryListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Biosolutions, LLC, Chagrin FallsListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Geauga County Department of Water Resources, ChardonListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Eurofins Built Environment Testing East - NJ (formerly International Asbestos Testing Lab), Cherry HillListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- ALS Environmental - Cincinnati, CincinnatiListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Q Laboratories, CincinnatiListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- EMSL Analytical, Inc., CinnaminsonListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Cleveland Water Compliance Laboratory, ClevelandListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Eurofins Environment Testing North Central (formerly Metiri Analytical Group, Inc.), ClevelandListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Benchmark Environmental Labs, Inc., ColumbusListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Coshocton Environmental Testing, LLC, CoshoctonListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Alliance Technical Group, LLC-Akron (formerly Summit Env. Tech.), Cuyahoga FallsListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- NEORSD Analytical Services, Cuyahoga HeightsListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Ream & Haager Laboratories, Inc., DoverListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Pace Analytical Services, LLC – East Longmeadow, East LongmeadowListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Onterris Laboratories LLC - El Dorado Hills (formerly Enthalpy), El Dorado HillsListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Pace Analytical Services, LLC - Dayton, EnglewoodListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- BoJhun Environmental Services, FostoriaListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Superior Laboratories, GallowayListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Pace Analytical Services, LLC – Greensburg, GreensburgListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- ALS Environmental – Holland, HollandListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Metiri – Holt, HoltListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- ALS Environmental - Kelso, KelsoListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Eurofins Lancaster, LancasterListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Eurofins DW and WW Central - Lima (formerly Alloway Lima), LimaListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Pace Analytical Services, LLC - Madisonville, MadisonvilleListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Pace Analytical Services, LLC – Mansfield (formerly Alpha Analytical), MansfieldListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Microbac Laboratories, Inc. – Marietta Division, MariettaListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Eurofins DW and WW Central - Marion (formerly Alloway Marion), MarionListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Kleinfelder Water Technologies Laboratory (formerly Industrial Fluid Management, Inc.), McClureListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- SafeSource Water Analytics LLC, McConnelsvilleListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Eastern Lab Services, Ltd., MedinaListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- CETEC Cleveland Environmental Technology, Inc., Middleburg HeightsListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Edenridge Laboratory, Ltd. (formerly Holmes Laboratory, Inc.), MillersburgListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Pace Analytical Services, LLC – Minneapolis, MinneapolisListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Maine Laboratories LLC (dba PFAS Laboratories), NorridgewockListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Jones & Henry Laboratories, NorthwoodListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Battelle Analytical Chemistry Services, NorwellListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Eberline Analytical Corporation, Oak RidgeListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- SGS North America Inc. - Orlando, OrlandoListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Pace Analytical Services, LLC – Ormond Beach, Ormond BeachListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- MASI Laboratory, Plain CityListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Eurofins Pomona, PomonaListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- The Ohio State University Stone Laboratory, Put-in-BayListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Ohio Department of Agriculture Consumer Protection Laboratory, ReynoldsburgListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Eurofins Sacramento, SacramentoListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Erie County Health Department Laboratory, SanduskyListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Eurofins South Bend, South BendListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- EnviroScience, StowListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Analytical Services, Inc., WillistonListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Onterris Laboratories LLC – Wilmington (formerly Enthalpy), WilmingtonListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- SGS North America Inc. – Wilmington, WilmingtonListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Cardinal Environmental Lab, LLC, YoungstownListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
- Mahoning County Board of Health, YoungstownListed in Ohio EPA’s certified lab list. See the official list → (checked 2026-09-30)
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How to choose a lab
- Pick a lab on the official list above that is certified for each test you need (bacteria and chemistry are often separate certifications).
- Ask for the lab’s own sample bottles and instructions; bacteria samples usually must reach the lab within 24–30 hours.
- Compare prices for a basic package (bacteria, nitrate, pH/TDS) and add arsenic or other metals where local data shows a risk.
- Be wary of free in-home tests from treatment-system sellers — see our salesperson checklist.
Questions
Where can I get my well water tested in Ohio?
Use a lab on Ohio’s official certified-lab list. We count 63 listed labs (excluding those marked as serving public water systems only), most in Cuyahoga Falls, Marietta, Canton. Confirm the lab is certified for the exact tests you need before you send a sample.
What should I test my well for in Ohio?
Test every year for bacteria (total coliform and E. coli), nitrate, pH and total dissolved solids (CDC). In Ohio, 15% of sampled wells with arsenic data were above the EPA limit, so include arsenic. Use our test helper for a list that fits your home.
Is there well water data for my county in Ohio?
Yes for 34 counties: we show the share of sampled wells above the EPA arsenic and nitrate limits, from the Water Quality Portal (USGS/EPA). These are monitoring wells as well as private wells, so test your own well.