Oklahoma labs

Two paths are independently verified for private well owners through the Oklahoma Department of Environmental Quality (DEQ) State Environmental Laboratory Services (SELS): (1) private Total Coliform / E. coli sampling with DEQ kits and a published private sampling guide (return within 28 hours; do not ship Friday or weekend); (2) private chemistry including nitrate/nitrite (private guide; return within 48 hours), lead, and the Water Wellness panel described in DEQ’s Private Well Analysis fact sheet. Request kits by Water Test Request, phone 405-702-1000, or email selsd@deq.ok.gov. The table below lists 17 in-state laboratories tagged Commercial on DEQ’s Accredited_Labs_2026 GIS roster (retrieved 18 September 2026). Municipal / utility plants, permittee and industrial labs, state SELS and agriculture labs, research labs, and out-of-state entries are omitted from the commercial table. Call before you collect water.

Sources retrieved 18 September 2026. Private-well guidance: SELS Sample Collection Assistance · Water Test Request · Private Total Coliform & E. coli instructions (PDF) · Private Nitrate + Nitrite instructions (PDF) · Private Water Well Analysis (PDF) · Home Water Testing (PDF) · SELS Technical Assistance. Accredited lab roster: DEQ Accredited Laboratory search · Accredited_Labs_2026 GIS layer · Laboratory Accreditation program.

What we could and could not verify

DEQ GIS layer Accredited_Labs_2026 queried successfully for Physical_State = OK (100 in-state features) on 18 September 2026.
Verified private-well paths: SELS private Total Coliform / E. coli (28-hour hold; private sampling PDF) and SELS private chemistry / Water Wellness / nitrate+nitrite (Water Test Request; Private Well Analysis and Home Water Testing fact sheets).
In-state commercial labs tabulated: 17 (BusinessCa = Commercial, excluding state SELS and state agriculture). Commercial private-well acceptance: unknown — call first. The GIS layer does not reprint the search app’s “Commercial Sample” column.
Municipal / utility labs omitted from the commercial table: 9 (City of Lawton; City Of OKC WTP Lab Hefner; City of Norman -WTP Lab; City of Edmond Water Resources Micro Lab; City of Midwest City; City of Durant; City of Tulsa — Microbiology / Wet Chemistry / Instrumentation).
State SELS principal laboratory and Ok Dept. of Ag-Laboratory omitted from the commercial table (SELS documented in verified paths).
Permittee (58), Industrial / Induistrial (12), Field laboratory Accreditation (1), and Research (1; Oklahoma Water Survey/OU) omitted from the commercial table.
Out-of-state labs on the nationwide Accredited_Labs_2026 layer omitted — use the official DEQ lab search.
Parameter-level accreditation is not on this GIS export — DEQ says contact Laboratory Accreditation at 405-702-1000 or labaccreditation@deq.ok.gov to verify a specific analyte.
Fees intentionally omitted (Water Test Request and Lab Services Fees list amounts that can change). Confirm current fees with SELS.
No current downloadable PDF drinking-water lab list found; obsolete 2005–2006 Digital Prairie list was not used.

Verified for private well owners

SELS private Total Coliform / E. coli

Sample Collection Assistance · Private Total Coliform & E. coli sampling guide (PDF) · Water Test Request · Technical Assistance

DEQ SELS publishes a private-customer sampling guide for SM 9223B Total Coliforms and E. coli. As printed: plan enough time so samples are returned within 28 hours of collection; do not ship on a Friday or weekend; use the DEQ kit (chain of custody, 100 mL bottle with preservative, barcode label when provided).

How to get supplies (as printed on SELS pages): call 405-702-1000, email selsd@deq.ok.gov, or use the Water Test Request form (mailed kit or pick-up at the lab). Technical Assistance states there are no state rules requiring private-well testing, but lenders often require Total Coliform and E. coli before closing.

Delivery (as printed on the private TC guide): courier — Oklahoma Department of Environmental Quality, State Environmental Laboratory, 707 N. Robinson, Oklahoma City, OK 73102; USPS — P.O. Box 1677, Oklahoma City, OK 73102; personal delivery — Sample Management Unit (northeast corner door), Monday–Friday 8:00 a.m. to 4:30 p.m. except state holidays.

Fees: Confirm current amounts with SELS / Lab Services Fees — this directory does not republish a fee table.

SELS private chemistry / Water Wellness

Water Test Request · Private Water Well Analysis (PDF) · Home Water Testing (PDF) · Private Nitrate + Nitrite sampling guide (PDF) · Laboratory Services Fees

DEQ’s Private Well Analysis fact sheet states federal and Oklahoma governments do not regulate privately owned wells; the private well owner is responsible for testing. The fact sheet describes SELS’s Water Wellness panel as including chloride, conductivity, copper, hardness, iron, lead, manganese, nitrate/nitrite, pH, sodium, and sulfate.

Home Water Testing (fact sheet dated 10/2024) recommends testing private supplies every year for total coliform bacteria, nitrate/nitrite, conductivity, and pH (and more often after well work or a noticeable change).

Private Nitrate + Nitrite sampling instructions (EPA 353.2) state samples must be returned within 48 hours in the DEQ-provided bottle. Confirm which parameters are available for private customers, bottle orders, hold times, and current fees before you collect.

In-state commercial laboratories on the DEQ Accredited_Labs_2026 roster

Call to confirm they still hold accreditation for the tests you need, that they will take your private-well sample, and how to ship or drop off. 0 of 17 commercial rows are independently verified for private-well acceptance. Municipal/utility, permittee, industrial, research, state SELS/agriculture, and out-of-state labs omitted.

17 Oklahoma in-state laboratories with BusinessCa=Commercial on DEQ Accredited_Labs_2026 GIS (retrieved 18 September 2026). State SELS, state agriculture, municipal/utility, permittee, industrial, research, and out-of-state omitted. Private-sample acceptance not printed on this GIS layer.
Laboratory	City	Address	Phone	DEQ ID	EPA ID	Overall certification (GIS)	Web (GIS)	Accepts private wells?	Mail / drop-off
Environmental Resource Technologies	Ada	131 Arlington St., Ada, OK 74820-0722	580-332-8808	8304	OK00921	Accredited	unknown	unknown — call first	unknown
Baseline Laboratories	Choctaw	2040 N Harper St., Choctaw, OK 73020	405-390-2522	1602	OK01069	Accredited	unknown	unknown — call first	unknown
Elk City Environmental	Elk City	10748 N1990 Rd, Elk City, OK 73644	580-210-9612	D9941	OK01034	Accredited	unknown	unknown — call first	unknown
Southern Plains Environmental Laboratory	Lawton	704 SW 11th Street, Lawton, OK 73501	580-280-2626	D9943	OK01035	Accredited	unknown	unknown — call first	unknown
Ana-Lab Corporation, OK Field Office	Norman	1824 Atchison Dr., Norman, OK 73069	405-292-6630	1402	OK01055	Accredited	www.ana-lab.com	unknown — call first	unknown
Wright Environmental Services, Inc.	Norman	413 Highland Parkway, Norman, OK 73069	405-749-7800	1313	OK01051	Accredited	unknown	unknown — call first	unknown
Accurate Laboratory - OKC	Oklahoma City	12036 N. Pennsylvania, Oklahoma City, OK 73120	405-751-3132	7202	OK00129	Accredited	unknown	unknown — call first	unknown
Environmental Testing Inc.	Oklahoma City	4619 North Santa Fe, Oklahoma City, OK 73118	405-488-2400	7211	OK00047	Accredited	www.etilab.com	unknown — call first	unknown
Marsil Laboratories, LLC	Oklahoma City	3816 N Meridian Ave, Suite 113, Oklahoma City, OK 73112	405-917-5517	D9951	OK01090	Accredited	www.marsillab.com	unknown — call first	unknown
Red River Environmental Lab & Cons.	Oklahoma City	6510 S. Western Ave., Oklahoma City, OK 73139	405-232-1966	9953	OK01001	Accredited	www.redriverelcc.com	unknown — call first	unknown
Accurate Labs Inc. - Stillwater	Stillwater	505 South Lowry Street, Stillwater, OK 74074	405-372-5300	8316	OK00092	Accredited	www.accuratelabs.com	unknown — call first	unknown
Cove Environmental, LLC.	Stillwater	3400 W. Lakeview Rd., Stillwater, OK 74075	405-372-2122	9961	OK01095	Accredited	www.covesciences.com	unknown — call first	unknown
Accurate Labs-Tulsa	Tulsa	3910 E 51st St, Tulsa, OK 74135	405-372-5300	9905	OK00983	Accredited	unknown	unknown — call first	unknown
Enercon	Tulsa	5100 E. Skelly Drive #450, Tulsa, OK 74135	918-665-7693	1605	OK01070	Accredited	unknown	unknown — call first	unknown
Green Country Testing, Inc.	Tulsa	6825 E. 38th Street, Tulsa, OK 74145	918-828-9977	7604	OK01007	Accredited	www.greencountrytesting.com	unknown — call first	unknown
Pace Analytical - Tulsa Service Center	Tulsa	5460 S. Garnett Rd. Ste. P, Tulsa, OK 74146	918-437-1742	1608	OK01073	Accredited	www.pacelabs.com	unknown — call first	unknown
Tulsa City-County Health Department	Tulsa	5051 South 129th E. Ave., Tulsa, OK 74134	918-595-4200	9916	OK00001	Accredited	www.tulsa-health.org	unknown — call first	unknown

Official tools if you need more labs

DEQ Accredited Laboratory search — official search; note the “Commercial Sample” column on results for labs accepting private samples.
Accredited_Labs_2026 GIS layer — machine-readable 2026 roster used for this page.
Laboratory Accreditation program — contact 405-702-1000 / labaccreditation@deq.ok.gov for parameter verification.
SELS Sample Collection Assistance · Water Test Request.
Oklahoma Well Owner Network (OSU) — Extension screening events; OWON itself states certified testing goes through Oklahoma DEQ.