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Environmental Laboratory (NELAP) Accreditation

This page offers information on the Agency's National Environmental Laboratory Accreditation Program (NELAP)

Laboratories are assessed against the provisions of the 2009 TNI NELAP standards.


2019 Environmental Trade Fair and Conference
TCEQ's Environmental Trade Fair and Conference will be held May 14-15, 2019 at the Austin Convention Center

More information can be found at the agency's dedicated Trade Fair and Conference link:
Environmental Trade Fair and Conference (ETFC)


Basic Assessor Training
Marlene Moore, Advanced Systems, Inc., will be teaching the "Environmental Laboratory Assessments - Basic Assessor Training" course at the TCEQ Austin Campus on April 15-17, 2019.

A course description and a registration link are currently up on The NELAC Institute page  Environmental Laboratory Assessments - Basic Assessor Training.  Registration is open until March 22, 2019.


Additions to the TCEQ's Fields of Accreditation (FoAs) - MUR and Drinking Water
The TCEQ Laboratory Accreditation Program is issuing a revision to its Fields of Accreditation (FoAs) to include the following analytical methods:

EPA 608.3, EPA 624.1, and EPA 625.1 in Non-Potable Water; and

SM 4500-Cl¯ B, and ASTM D516-11 in Drinking Water.

The fields are being revised to incorporate revised methods from the most recent Method Update Rule (MUR) and add methods requested by the TCEQ Drinking Water Program.  The additional methods and analytes are shown in Appendix A.  The changes to the fields of accreditation will be effective April 12, 2019.  From this date on, laboratories submitting data analyzed by these methods need to be accredited or risk having their data refused by TCEQ.

Appendix A (PDF)

The TCEQ Water Quality Division (WQD) will accept analytical data from accredited and in-house laboratories based on the previous Method Update Rule (2012) up to but not beyond August 28, 2019.  The WQD will accept analytical data from non-accredited and in-house laboratories using the new laboratory methods in the current Methods Update Rule (2017) within six months after the FOA effective date or if the laboratory has accreditation for the pollutant and new method in a state other than Texas.  For questions regarding what data will be accepted, please contact the TCEQ WQD at 512-239-4539 or gregg.easley@tceq.texas.gov.  For questions regarding the two new Drinking Water methods, please contact the TCEQ WSD at 512-239-2353 or jessica.hoch@tceq.texas.gov.

 In order to add any of these additional parameters to an existing scope of accreditation, a laboratory must submit:

  • An amended application
  • Applicable FoA sheets
  • A $250.00 administrative fee
  • Associated documentation including:
  • Standard Operating Procedures
  • Demonstrations of Capability and Method Detection Limit Studies
  • Applicable PT results for all parameters being added (that are also Fields of Proficiency Testing (FoPTs) )

Note:  The laboratory will not have to pay the $250 administrative fee to change their scope of accreditation if it is done as part of the laboratory’s annual renewal.  Any applicable category fees will still apply.  If a laboratory has submitted PT results for EPA Methods 608, 624, and 625, they are not required to submit PT results for EPA Methods 608.3, 624.1 and 625.1.

TCEQ will review applications in the order they are received.  Laboratories submitting incomplete or inaccurate applications will be notified of the deficiencies and will need to submit a corrected application.  The corrected applications will be placed in the queue based on the date TCEQ receives the corrected application.  Due to the time required to review the applications, any initial or corrected application received after January 12, 2019, may not be reviewed by April 12, 2019. 

The future FOA listing (Revision 18) has been added just below the current FoA listing (Revision 17).  More information on fees and procedures for completing applications are available under our FAQ guides:

FAQ guides (PDF)

For questions regarding accreditation procedures, please contact the TCEQ Laboratory Accreditation Program at 512-239-3754 or labprgms@tceq.texas.gov.


Subscribe to Laboratory Accreditation Program e-mail updates

Go to this link: Get e-mail updates on your choice of topics.

After entering your e-mail address and personal preferences, mark the Laboratory Accreditation / Environmental Laboratory (NELAC) Accreditation box.


Application, Fields of Accreditation, Checklists, and Procedures

Application (PDF) (Revision 9 - June 2017)

Current Fields of Accreditation (FoAs) (PDF) (Revision 17 - October 2016)

Future Fields of Accreditation (FoAs) (PDF) (Revision 18 - April 2019) 


History of changes to the Fields of Accreditation (PDF)


The current list of accredited laboratories, with links to their scope of accreditation, can be accessed here:

List of Accredited Laboratories (PDF)


The accreditation team uses the 2009 TNI Quality Systems checklist Exit the TCEQ to determine each laboratory's conformance to the elements of this Standard. A copy of the TNI checklist is now available directly from their web page.

Be advised that you must have a copy of the TNI Standard ELV1, Management and Technical Requirements for Laboratories Performing Environmental Analyses before you may download this checklist.


TCEQ (Internal) Accreditation Procedures (PDF)


Accreditation applications in progress (PDF)


For administrative information, please contact our records specialist at 512/239-3754 or e-mail us at labprgms@tceq.texas.gov.


For additional information, including suitable ways to obtain traceability of measurements, or to make a complaint, please contact the program manager at 512/239-1990 or e-mail us at labprgms@tceq.texas.gov.


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Laboratory Resources

FAQ guides.  This is a document addressing frequently asked questions regarding the Texas laboratory accreditation program:

FAQ guides (PDF)


Corrective Action Response (CAR) form.

CAR form (Word)

Corrective Action Response Guidelines For TCEQ Accredited Laboratories (Presentation from 2017 Trade Fair) (Powerpoint)


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External Links


The NELAC Institute (TNI) Exit the TCEQ


National Environmental Laboratory Accreditation Program (NELAP) designated proficiency testing providers Exit the TCEQ


NELAP Fields of Proficiency Testing Exit the TCEQ


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Our mailing address is:

Texas Laboratory Accreditation Program
Texas Commission on Environmental Quality
P.O. Box 13087, MC-165
Austin, TX 78711-3087


Our physical address for overnight mail delivery is:

Texas Laboratory Accreditation Program
Texas Commission on Environmental Quality
12100 Park 35 Circle, Bldg B, MC-165
Austin, TX 78753


Rules (Including Fees) and Accreditation Standards

Title 30, Texas Administrative Code, Chapter 25 Exit the TCEQ, Subchapters A and B (for a schedule of fees refer to §25.30)



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