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Laboratory Accreditation     

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The Oklahoma Department of Environmental Quality operates the laboratory accreditation program to insure the quality of analytical data received by the DEQ Water Quality Division and other state agencies for compliance and decision making purposes. Our goal is to provide standards for accreditation of privately and publicly owned laboratories for performance of analyses of water, wastewater and sludge.

Laboratories are accredited to do general water quality, sludge testing, and drinking water analyses. A laboratory may not be accredited to perform all the possible parameters offered for accreditation. To verify that a laboratory is currently accredited for a particular parameter, please contact David Caldwell at (405) 702-1039 or Mikeshell Riley at (405) 702-1020..

This page last updated on April 21, 2014

Accredited Laboratories

Acredited Laboratory Laboratory Search

DEQ GIS Map and Data Viewer
DEQ GIS lists only Oklahoma Accredited Laboratories for accredited laboratories outside Oklahoma please refer to "List of Laboratories Accredited for General Water Quality and Drinking Water"

test tubes


DMR-QA Study Participation Waiver (PDF)

EPA 2012 MUR SM 22ed Approval Letter (PDF)


GCMS vials

OAC 252:301 Laboratory Accreditation program is currently updating references to the EPA Method Update Rule of 2012; implementation has been anticipated to become effective September 1, 2014.

OAC 252:302 Field Laboratory Accreditation program is currently updating references to the EPA Method Update Rule of 2012; implementation has been anticipated to become effective September 1, 2014.

OAC 252:303 TNI Laboratory Accreditation implementation has been extended to January 2016. This will allow the DEQ time to review the current language. On November 1, 2013 House bill 1455 became effective thus eliminating the Laboratory Service Advisory Council. The laboratory accreditation program has now been moved into the Water Quality Management Advisory Council which will hear a revised draft set of TNI Rules now under OAC 252:307 TNI Laboratory Accreditation which will be proposed at the next council meeting scheduled in July 2014.

Links to the Laboratory Accreditation Rules may be found at: 

Consumer Price Index Adjustment to Lab Accreditation Fees
Annual fees for Laboratory Accreditation were increased by 1.015% based on changes in the Consumer Price Index and as provided by 252:301-1-9(d).  Invoices for FY 2015 renewals reflected this change.  

FY 15 Laboratory Accreditation Fees

FY 15 Field Laboratory Accreditation Fees

Laboratory Beakers and Vials


TNRCC 1005 (Adobe Acrobat)

OK GRO Method Rev 4.1(Adobe Acrobat)

OK DRO Method Rev 4.1 (Adobe Acrobat)

Application for field accreditation - Initial:Renewal

Application for general water quality/sludge testing accreditation - Initial:Renewal

Application for drinking water accreditation - Initial:Renewal

EPA's Drinking Water Guidance Manual

The NELAC Institute (TNI)

Information concerning The NELAC standards and guidance for implementation may be found at the following links:


DEQ Policies

Alternative Protocol to Ammonia Pre-Distillation Requirement

Laboratory Glassware

Laboratory Beakers and Vials

Fact Sheets

Selecting an Accredited Laboratory fact sheet

Other Links

EPA Clean Water Act Analytical Methods

EPA SW-846

National Environmental Methods Index (NEMI)

Guidance Documents

Proficiency Testing Guidance

Guidance Documents Calibration Protocol (MS Word)

Oklahoma Lab Systems Audit Checklist OAC 252:301

Oklahoma Field Lab System Audit Checklist OAC 252:302



If you have questions or need further information concerning Laboratory Accreditation
contact David Caldwell at (405) 702-1039.


SELS Toll-Free: 1-866-412-3057 or 1-405-702-1000

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