Environmental Laboratory (NELAP) Accreditation
Laboratories are assessed against the provisions of the 2009 TNI NELAP standards.
The TCEQ Lab Accreditation Program is issuing a revision to the drinking water fields of accreditation for microbiology. The fields have been revised to provide more clarity for the accredited laboratory, to include E. coli as an analyte in addition to total coliforms for presence/absence analyses, and to reflect the Revised Total Coliform Rule (40 CFR 141.851) which went into effect on April 1, 2016. The changes to the drinking water fields of accreditation for microbiology will be effective October 15, 2016.
Currently accredited laboratories will receive a revised scope on October 15, 2016. The renewal date for a laboratory’s accreditation will not change. No action is required for currently accredited laboratories.
Beginning October 15, 2016, a laboratory submitting an application for accreditation or those seeking amended fields to a current accreditation, will submit the revised field of accreditation checklist with their application.
New Fields Summary (PDF)
Effective May 1, 2016, SM 4500-CN¯ F will be added to the Drinking Water Fields of Accreditation. The analyte offered for this method will be Free cyanide. From this date on, laboratories submitting free cyanide data by this method need to be accredited or risk having their data refused by the TCEQ.
The analyte, Free cyanide, is not listed on the TNI Fields of Proficiency Testing Table; therefore, there is no requirement in the TNI Standard to analyze two Proficiency Testing (PT) samples per year. However, 40 Code of Federal Regulations (CFR), Part 141.23.k.3 requires any laboratory analyzing for free cyanide in drinking water by SM 4500-CN¯ F to achieve quantitative results within defined acceptance limits on one PT sample per year. The TCEQ has determined that, due to the composition of the PT sample, a laboratory can analyze the total cyanide PT sample from the TNI FoPT table using SM 4500-CN¯ F to meet the requirement in 40 CFR. The results from the analysis using SM 4500-CN¯ F should not be submitted to the TCEQ.
There is no change in the accreditation or PT requirements for laboratories analyzing total cyanide by SM 4500-CN¯ C,E and SM 4500-CN¯ E.
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Application, Fields of Accreditation, Checklists, and Procedures
Application (PDF) (Revision 7 - August 2012)
Current Fields of Accreditation (FoAs) (PDF) (Revision 15 - December 2014)
The current list of accredited laboratories, with links to their scope of accreditation, can be accessed here:
The accreditation team uses the 2009 TNI Quality Systems checklist 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.
For administrative information, please contact our records specialist at 512/239-3754 or e-mail us at firstname.lastname@example.org.
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 email@example.com.
Frequently Asked Questions (FAQs)
This is a document addressing frequently asked questions regarding the Texas laboratory accreditation program:
FAQ guides (PDF)
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:
Rules (Including Fees) and Accreditation Standards
- Title 30, Texas Administrative Code, Chapter 25 , Subchapters A and B (for a schedule of fees refer to §25.30)