Certified labs by state
Oklahoma
Oklahoma residents using private wells rely mainly on the Oklahoma Department of Environmental Quality (DEQ) for water-testing guidance and lab accreditation, and on the Oklahoma Water Resources Board (OWRB) for well-driller and pump-installer oversight. For central Oklahoma well owners, DEQ specifically flags the Garber-Wellington/Central Oklahoma Aquifer for naturally occurring arsenic, chromium, selenium, and uranium concerns.
Checked against official sources on October 4, 2026. Rules and links change; confirm with the office listed before you act.
- Certifies drinking water labs
- Oklahoma Department of Environmental Quality (DEQ), Laboratory Accreditation Program
- Official certified lab list
- Official page →
- Free or low-cost testing
- Oklahoma State University's Oklahoma Well Owner Network offers free basic household well-water screening at scheduled events, and DEQ says private wells drawing from the Central Oklahoma Aquifer qualify for a special analytical fee.
Official resources in Oklahoma
Search for Oklahoma-accredited laboratories and confirm a lab's scope before ordering drinking-water tests.
Hub for DEQ fact sheets residents use for private well analysis, home water testing, metals, and regional contaminant guidance.
Lists which well-water tests DEQ recommends for specific situations like infants, agriculture, oil and gas activity, lead plumbing, and radon.
OSU's statewide outreach program posts scheduled events for free basic household well-water screening.
Explains Oklahoma well-driller and pump-installer licensing and links residents to well records and contractor resources.
Key facts for Oklahoma
- Oklahoma DEQ certifies/accredits drinking-water laboratories through its Laboratory Accreditation Program.
- OSU Extension says private wells should be tested every year for nitrates, TDS, pH, and fecal coliform.
- DEQ says if you live in Oklahoma, Logan, Canadian, Cleveland, or Pottawatomie counties, test for uranium, chromium, arsenic, and selenium.
- DEQ says intensive agriculture nearby warrants testing for nitrite-nitrate, pesticides, coliform bacteria, and conductivity.
- DEQ says nearby oil or gas drilling warrants testing for chloride, sulfate, sodium, barium, strontium, and conductivity.
- DEQ says radon is naturally released from uranium decay in rock, soil, and water; its testing sheet recommends radon testing in radon-rich areas.
What to do next
- Use the DEQ lab search first, then confirm the lab is accredited for the exact analytes you need before collecting samples.
- If your home uses a private well, start with annual nitrate, TDS, pH, and fecal coliform testing, then add location-based tests such as metals or radon.
- If your well is in central Oklahoma or near agriculture, feedlots, mining, or oil and gas activity, use DEQ's situation-based testing table to add targeted contaminants.
Helpful guides
- How to choose a state-certified drinking water lab
- What to test your private well water for (and how often)
- How to collect a well water sample without ruining the test
- How to read a water test report: MCLs, units and flags