About this list
- Agency
- Oklahoma Department of Environmental Quality (ODEQ) - Laboratory Accreditation Program
- Format
- Searchable database (ODEQ Lab Facility Search), report export (Excel/PDF), matrix Drinking Water, analyte-level
- Homeowner flag
- Yes/no from ODEQ's 'Commercial Sample' column. ODEQ: "To view laboratories accepting private samples, see the 'Commercial Sample' column". ODEQ does not say whether 'private samples' means household wells, so call first.
ODEQ Lab Facility Search - laboratories accredited by the DEQ Laboratory Accreditation Program (Matrix: Drinking Water). Fetched 2026-11-02 (UTC).
Official sourceTesting your well in Oklahoma
How often to test
- Oklahoma DEQ recommends testing every year for total coliform bacteria, nitrate/nitrite, conductivity and pH, especially for a new well or after work on the pipes, pressure tank, pump or well casing. If you have taste, odor or staining problems, it suggests testing sulfate, chloride, iron, manganese, hardness and corrosivity (pH and alkalinity) every three years. [1]
- DEQ says it is preferable to test for coliform bacteria and nitrate/nitrite early in a pregnancy, and recommends testing before bringing an infant home, especially if formula or food is prepared with well water. [1]
Free testing
We found no statewide free testing program in Oklahoma. Ask your county health department whether it runs one.
Buying or selling a home
- DEQ does not regulate private wells, but many mortgage lenders require a well test before closing, most often total coliform/E. coli, lead and nitrate/nitrite. Some lenders want the test done no more than 30 days before closing, and a positive coliform result can take several weeks to fix and retest, so DEQ advises confirming the required tests with your lender early. DEQ's lab offers report language for real estate customers and can provide sample bottles, instructions, mailing labels and forms. [2]
State lab and rules
- DEQ's State Environmental Laboratory tests private well water; DEQ says it is EPA-certified to do so. If you use another lab, DEQ says to make sure it is accredited for the tests you need. [1]
- DEQ's Laboratory Accreditation Program accredits privately and publicly owned labs for water analysis. A lab may not be accredited for every test, so check the specific parameter. [3]
What testing costs at the state lab
Oklahoma DEQ State Environmental Laboratory Services, Lab Services Fee Schedule FY27, effective July 1, 2026 through June 30, 2027 (card payments add a 2.25% merchant fee and a $2 portal fee)
| Test | Price |
|---|---|
| Private well annual test list (total coliform and E. coli, nitrate/nitrite, pH, conductivity) | $75 |
| Private well diagnostics test list (annual list plus calcium, copper, iron, manganese, sodium, hardness) | $175 |
| Daycare/real estate test list (total coliform and E. coli, nitrate, nitrite, lead) | $104 |
| Total coliform and E. coli (presence/absence) | $33 |
| Nitrate | $38 |
| Arsenic | $33 |
| Lead | $33 |
| Uranium | $33 |
| PFAS, regulated compounds (EPA 537.1) | $265 |
Prices as published when we checked on 2 Nov 2026. Private certified labs set their own prices.
Show the numbers
| Item | Value | Note |
|---|---|---|
| Zone 1 | 0 counties | |
| Zone 2 | 9 counties | |
| Zone 3 | 68 counties |
Radon in indoor air, not in water. EPA: Zone 1 = highest potential (average indoor radon may be above 4 pCi/L); Zone 2 = 2 to 4; Zone 3 = below 2. EPA says the map should not be used to decide whether an individual home needs testing. Source: U.S. EPA, Map of Radon Zones, county list (EPA 402/A-16/001, spreadsheet Sep 2025), accessed 2026-11-01.
- Oklahoma Department of Environmental Quality, Home Water Testing fact sheet (10/2024)
- Oklahoma Department of Environmental Quality, Real Estate Lender or Loan Transactions Sampling Guidance (10/2025)
- Oklahoma Department of Environmental Quality, Laboratory Accreditation
- Oklahoma Department of Environmental Quality, State Environmental Laboratory Services, Lab Services Fee Schedule FY27 (effective Jul 1, 2026)
- U.S. EPA, Map of Radon Zones, county list (EPA 402/A-16/001, spreadsheet Sep 2025)
Loan test (FHA, VA, USDA) in Oklahoma
- VA. Test results are valid for 90 days from the date the local health authority certifies them, unless the local authority says otherwise. VA’s chapter names no list of contaminants: the water must meet the local health authority’s requirements, or EPA guidelines where it has none. Your lender may ask for specific tests.
- FHA. A well test is required in the situations FHA’s handbook lists, among others, and the report may not be more than 180 days old at disbursement.
- USDA. Guaranteed loans need a water quality test for a private well, done by the local health authority or a state-certified lab, and no more than 180 days old at closing.
Here:
- Oklahoma DEQ State Environmental Laboratory Services, Lab Services Fee Schedule FY27, effective July 1, 2026 through June 30, 2027: Daycare/real estate test list (total coliform and E. coli, nitrate, nitrite, lead), $104 (checked 2 Nov 2026) source
Lenders can ask for more (extra tests, a particular lab, who takes the sample): ask your lender before you book. Federal rules as read on Nov 3, 2026 source 1 source 2 source 3. Full comparison: VA, FHA and USDA well water test requirements. Loan test kits sold by mail, with price and days to results: kits compared.
What Oklahoma labs say on their own websites
State lists say what a lab is certified for, not whether it takes your sample or what it costs. We read each lab’s own site; a second reader re-checked every fact below. 1 labs on this list are on our register so far; 1 say they take homeowner samples and 1 print a price.
| Lab | Bacteria (coliform / E. coli) | Nitrate | Arsenic | Lead | Basic well panel | Home sale / loan package | Turnaround |
|---|---|---|---|---|---|---|---|
| ServiTech, Inc. - Dodge City Dodge City, KS · You collect the sample with the lab's bottles | – | NO₃N Nitrate-Nitrogen, mg/L NO3-N (IC) $15.00 source | – | – | HOUSE COLI, EC, PH, NO₃, SO₄, F, CA, MG, NA, FE, MN, TDS, HARD $89.00 source | – | – |
Say they take homeowner samples: ServiTech, Inc. - Dodge City.
Prices exactly as each lab prints them, read 15 Nov 2026; re-checked every 90 days. Labs not shown have not been read yet or print nothing for homeowners. Confirm price and turnaround with the lab.
Labs by contaminant
Labs on the Oklahoma list for one test, with homeowner-accepting labs first.
Well water by county
Private-well population (USGS, 2015), arsenic estimate, radon zone and nearby labs for each county with at least 1,000 people on private wells, largest first.