15 named for nitrate itself on the list.
Per the state list or a state web page. Call to confirm.
Located outside Oklahoma but on its list.
USGS estimate for Oklahoma.
How many labs test for nitrate in Oklahoma
15 labs on Oklahoma's official drinking-water lab list are certified to test for nitrate. All 15 are named for nitrate on the list. 13 of them are marked as taking samples from the public. They are listed first. 8 are located outside Oklahoma.
The list is published by the Oklahoma Department of Environmental Quality (ODEQ) - Laboratory Accreditation Program. List version on file: Live database, searched 2026-11-02. Fetched 2026-11-02 (UTC).
Oklahoma labs certified for nitrate
Marked as taking public samples (13)
| Lab | Location | Nitrate certification | Public samples | Cert. expiry |
|---|---|---|---|---|
| Accurate Environmental Labs - Stillwater | Stillwater, OK | Named on the official list | Public samples: yes (per state) | Not on the list |
| Accurate Environmental Labs - Tulsa | Tulsa, OK | Named on the official list | Public samples: yes (per state) | Not on the list |
| Environmental Resource Technologies | Ada, OK | Named on the official list | Public samples: yes (per state) | Not on the list |
| Eurofins South Bend | South Bend, IN | Named on the official list | Public samples: yes (per state) | Not on the list |
| Microbac Laboratories, Inc. - Marietta | Marietta, OH | Named on the official list | Public samples: yes (per state) | Not on the list |
| OK DEQ State Env. Lab (EPA Drinking Water Certified) Principal State Laboratory | Oklahoma City, OK | Named on the official list | Public samples: yes (per state) | Not on the list |
| Pace Analytical Services - National Center for Testing and Innovation | Mt. Juliet, TN | Named on the official list | Public samples: yes (per state) | Not on the list |
| Pace Analytical Services - Ormond Beach, FL | Ormond Beach, FL | Named on the official list | Public samples: yes (per state) | Not on the list |
| Red River Authority of Texas Env. Services Lab | Wichita Falls, TX | Named on the official list | Public samples: yes (per state) | Not on the list |
| ServiTech, Inc. - Dodge City | Dodge City, KS | Named on the official list | Public samples: yes (per state) | Not on the list |
| SPL, Inc - Kilgore | Kilgore, TX | Named on the official list | Public samples: yes (per state) | Not on the list |
| Tulsa City-County Health Department | Tulsa, OK | Named on the official list | Public samples: yes (per state) | Not on the list |
| Weck Laboratories, Inc. | Industry, CA | Named on the official list | Public samples: yes (per state) | Not on the list |
Other labs on the list (2)
| Lab | Location | Nitrate certification | Public samples | Cert. expiry |
|---|---|---|---|---|
| City of OKC WQ Laboratory - Hefner WTP | Oklahoma City, OK | Named on the official list | Not marked as taking public samples Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Not on the list |
| City of Tulsa - Wet Chemistry | Tulsa, OK | Named on the official list | Not marked as taking public samples Looks like a utility or municipal lab, judging by the name (our label, not the state list) | Not on the list |
How the Oklahoma list marks public samples (whole list). 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.
Before you send a sample, call the lab to confirm it is currently certified for the exact test and method, that it accepts samples from homeowners, and how to collect and ship them. Status can change between list updates.
Why test for nitrate in Oklahoma
Nitrate has no taste or smell, and a lab report can state the same water in two units that differ by a factor of 4.43. Read our nitrate explainer.
EPA advises private-well owners to test every year for total coliform bacteria, nitrates, total dissolved solids and pH. [1]
Oklahoma guidance that mentions nitrate:
- 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. [2]
- 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. [2]
- 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. [3]
Prices at 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), as published when checked on 2 Nov 2026. Private certified labs set their own prices.
| Test | Price |
|---|---|
| Private well annual test list (total coliform and E. coli, nitrate/nitrite, pH, conductivity) | $75 [4] |
| Daycare/real estate test list (total coliform and E. coli, nitrate, nitrite, lead) | $104 [4] |
| Nitrate | $38 [4] |
About 356,860 people in Oklahoma used private wells in 2015, by the USGS estimate of people on domestic self-supplied water. [5] Federal limits are written for public water systems, not private wells, so testing is up to the owner.
For tests that depend on your home (farms nearby, old plumbing, a new baby), use the which-tests checklist. When results arrive, check your numbers against EPA's limits. State guidance, county data and every lab: Oklahoma.
Other tests in Oklahoma
- U.S. EPA, Protect your home's water
- 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, State Environmental Laboratory Services, Lab Services Fee Schedule FY27 (effective Jul 1, 2026)
- USGS, Estimated use of water in the United States, county-level data for 2015 (Dieter et al., ver. 2.0, 2018)
- ODEQ Lab Facility Search - laboratories accredited by the DEQ Laboratory Accreditation Program (Matrix: Drinking Water) (official list)
ODEQ Lab Facility Search - laboratories accredited by the DEQ Laboratory Accreditation Program (Matrix: Drinking Water).
Official source