Laboratory Certification

The Louisiana Department of Health (LDH) Laboratory Certification Program certifies laboratories analyzing drinking water under the EPA Safe Drinking Water Act (SDWA). In accordance with SDWA and state regulations, the LDH Laboratory Certification Program issues drinking water certification to laboratories performing microbiological and chemical testing of drinking water in the State of Louisiana.  The LDH Laboratory Certification Program is also a TNI NELAP-Recognized Accreditation Body and certifies laboratories for chemical testing of drinking water in accordance with the National Environmental Laboratory Accreditation Program (NELAP), which is accepted by EPA in lieu of drinking water certification.

A laboratory can request State or TNI NELAP certification for chemical testing of drinking water. A laboratory requesting certification is required to submit a completed application, appropriate fees, quality assurance manual, and meet State and/or TNI standards, which include but are not limited to participation in a proficiency testing program and on-site evaluations. Reciprocal TNI NELAP certification can also be granted with a completed application, appropriate fees, and current certificate from the primary TNI NELAP-Recognized Accreditation Body.  Certificates are issued for a period of 1 calendar year based upon successful completion of the certification process.


Laboratories that wish to apply for certification to perform chemical testing of drinking water can download the application here.

Guidance Document for the Application for Environmental Laboratory Accreditation Safe Drinking Water Program

Application and Online Payment for Environmental Chemistry Laboratory Certification Safe Drinking Water Program    

Application for Environmental Chemistry Laboratory Certification Safe Drinking Water Program Part B

Certification of Compliance


For additional information on:

  • EPA and drinking water, click here.
  • TNI NELAP, click here.
  • Drinking Water Lab Accreditation Rule, click here.


The links below provide the current list of laboratories certified to perform drinking water testing for certain chemistry or microbiology tests :


For more information on lab certification, please contact the LDH OPH Laboratory at 225-219-5200.