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The NWDLS Main Laboratory has been a National Environmental Laboratory Accreditation Program (NELAP) accredited laboratory with the Texas Commission on Environmental Quality (TCEQ) since 2008. The Toxicology Laboratory maintains accreditation with the TCEQ and the Louisiana Department of Environmental Quality (LDEQ). See below for our most recent scopes of accreditation.

Main Laboratory TCEQ scope of accreditation

Toxicology Laboratory TCEQ scope of accreditation

City of Houston WBE Certificate

NWDLS HUB Cert Exp 07-2018

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