U.S. Construction Materials Testing Laboratories Qualified by State DOTs and NVLAP
792 construction materials testing laboratory locations in the U.S. that a state department of transportation or NIST's NVLAP lists as qualified, approved, certified or authorized to test soil, aggregate, concrete, asphalt or reinforcing steel. Taken from 13 official lists published by 10 state DOTs (Arkansas, California, Illinois, Indiana, North Carolina, Oklahoma, Oregon, Texas, Utah, Wisconsin) plus the NVLAP directory, retrieved 2026-10-12. Each row gives the lab name, city and state where the list states them, the qualifying agency, the qualification scope as written (test methods or material groups), the expiry date where stated (510 rows), and the source document. It is not a complete census of U.S. testing labs: it covers only the lists named here.