ReqoData
Testing, Inspection & Certification Full list available · CSV Last verified: Oct 12, 2026

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.

Data Preview

* The first 5 rows of the full list (real data).
lab_namecompanystatecityqualified_byqualification_scope
AP Construction Testing, LLCARLittle RockArkansas DOT (ARDOT)ARDOT approved asphalt mix design laboratory (QPL 404)
APAC-Ark. Preston Quarry LabARVan BurenOklahoma DOT (ODOT)AG = Aggregate Testing; A = Asphalt Mixture Testing; C = Concrete Testing; N = AMRL Proficiency Sample Program Participant
APAC-Central (ARKHOLA Sand & Gravel, Co.)ARVan BurenArkansas DOT (ARDOT)ARDOT approved asphalt mix design laboratory (QPL 404)
APAC-Central, Inc. / McClinton Anchor DivisionARFayettevilleArkansas DOT (ARDOT)ARDOT approved asphalt mix design laboratory (QPL 404)
Atlas Asphalt, Inc. / Batesville DivisionARBatesvilleArkansas DOT (ARDOT)ARDOT approved asphalt mix design laboratory (QPL 404)

Showing 6 of 12 columns. All columns are listed below.

Full list: 792 rows · CSV · last verified Oct 12, 2026

* One-time payment via Stripe · Organization info only · No change-of-mind refunds (digital product)

Where the source data is published

Every source is published free of charge by a government body: the state DOT documents linked in source_url, and NIST's NVLAP directory (a U.S. Government work). ReqoData extracted and reformatted the entries; none of these agencies has reviewed or endorsed this product. Check the agency's current list before relying on a qualification for a contract.

Read the full note

About this list

Rows
792
Columns
12
Format
CSV (UTF-8, opens in Excel)
Last verified
Oct 12, 2026

Source data as of

Each list as published on 2026-10-12 (retrieval date); the date printed on each document is in source_document.

Last verified is the date we fetched the source data and confirmed it was the latest version the publishers had released.

What this list adds to the free source data

  • Combined 14 separate agency lists (PDF reports, a Google Drive file, HTML tables and the NVLAP directory) into one table with the same columns.
  • Kept one row per laboratory location per list; the qualification scope and expiry are carried over from each list as written.
  • Left out 43 laboratories run by government bodies (state DOT district and central labs, county and city labs, county engineering districts) and 39 entries whose stated qualification had already expired on 2026-10-12.
  • Left out the contact person, email and phone that most of these lists print; only organization-level fields are included.

Limitations and what's not included

  • Coverage is limited to 10 state DOTs and NVLAP. Many states (for example Florida, Georgia, Arizona, Massachusetts, Nebraska, South Carolina, West Virginia) publish lists that could not be retrieved without a browser or were unreachable on 2026-10-12, and other states publish no laboratory list. Labs accredited only by AASHTO re:source, A2LA or IAS are not covered because those directories' terms do not allow reuse.
  • The lists differ in purpose: Wisconsin, Oklahoma, Oregon and Utah qualify labs for general acceptance testing; the Texas, Indiana, Illinois, Arkansas, North Carolina and California lists cover one test or one purpose (for example ASR testing, Hamburg wheel-tracking, asphalt mix design, geotechnical testing, rebar splice testing). Read qualification_scope before comparing rows.
  • The same company location can appear more than once when several lists qualify it (277 rows share a lab name with at least one other row, counted on exact lab_name in the CSV; most are different branches of the same company).
  • Many rows are contractor or producer quality-control labs (asphalt plants, quarries, precast plants), not independent commercial testing firms. Some lists include out-of-state labs; state is the lab's location, not the qualifying state.
  • Utah's list gives no addresses, so most Utah rows have no city or state. The Illinois list writes a state only for out-of-state locations; its other rows are filled with IL on that basis.
  • Texas Hamburg and Overlay lists give an approval month, not an expiry; several Texas, Indiana, Arkansas and North Carolina lists state no expiry at all. The Arkansas list file is dated 2025-04-11 and the Indiana list 2024-12-05; they were the versions posted on the retrieval date.
  • 323 rows (319 of them from Wisconsin, whose qualifications all run to December 31) have a stated expiry of 2026-12-31. A re-check against WisDOT's 2027 list is planned for January 2027; until then those rows show the 2026 qualification only, and some may lapse.
  • The TxDOT ASR (C1260/C1567) list states 'Effective Date: March 21, 2025' while its page footers are dated February 23, 2026; source_document uses the effective date printed in the body.
  • Laboratory names are kept as written, including abbreviations, typos and truncations in the source (for example 'Clark Aphalt Products', 'Blankenship Asphalt Tech…').
  • No contact details are included.

Where the source data is published

Every source is published free of charge by a government body: the state DOT documents linked in source_url, and NIST's NVLAP directory (a U.S. Government work). ReqoData extracted and reformatted the entries; none of these agencies has reviewed or endorsed this product. Check the agency's current list before relying on a qualification for a contract.

Organization info only. The list contains no personal contact details of individuals.

Columns in the CSV (12)

ColumnDescription
lab_nameLaboratory name as written in the qualifying list (an AASHTO-accreditation asterisk and the Oklahoma qualification codes are removed from the name; the codes are in qualification_scope). Some lists name a branch or plant lab, e.g. 'Knife River - Coos Bay'.
companyParent company, only where the list itself writes it: a 'Company - location' or 'Company (… Lab)' label, a 'dba' name, or a separate producer column. Empty otherwise; it is not looked up elsewhere.
stateTwo-letter state of the laboratory location as written in the list. Empty where the list gives no state (most Utah rows). For the Illinois list the state is written only for out-of-state locations, so its other rows are filled with IL (see limitations).
cityCity of the laboratory location as written in the list. Empty where the list gives none or the address cannot be split reliably.
qualified_byAgency whose list qualifies the laboratory: a state DOT or NIST NVLAP.
qualification_scopeWhat the lab is qualified for, as written in the list: test methods (AASHTO/ASTM/agency methods), material groups, or the list's single purpose (e.g. 'Tex-242-F Hamburg Wheel-Tracking Test'). Long for Wisconsin, which lists every method.
qualification_expiryExpiry / 'authorized until' date as written in the list, normalised to YYYY-MM-DD. Empty when the list states none. Rows whose stated expiry is before the retrieval date are not included.
approval_dateApproval or effective date of the lab's listing where the list gives one (TxDOT Hamburg/Overlay: month of approval as MM/YYYY; Wisconsin: effective date). Empty otherwise.
source_lab_idLaboratory number the list assigns, where it has one (Oklahoma lab ID, Indiana lab no., Illinois producer no., Oregon lab no., Wisconsin trailer no., NVLAP lab code).
source_urlDirect URL of the document or page the row was taken from.
source_documentTitle of that document and the date printed on it.
last_verifiedDate the source document was retrieved and the row extracted.

Sources and licenses

Last verified: Oct 12, 2026

Frequently Asked Questions

Q.Where does the data come from?

Mainly from the official registers and other public data listed on this page under “Sources and licenses”. For some lists, ReqoData added columns (such as website URLs) after checking each organization's own website; those sources are listed there too. Organization info only — no personal contact details.

Q.Is the full list available now?

Yes. After payment you get the CSV (792 rows, last verified Oct 12, 2026) on a download page right away.

Q.What does it cost?

$149, a one-time card payment through Stripe. There is no subscription. As a digital product, it can't be returned for change of mind; if the file has a material error, report it from the download page and we'll provide a corrected file or a refund.

Q.Is the list updated after purchase?

No. The CSV reflects the sources as of Each list as published on 2026-10-12 (retrieval date); the date printed on each document is in source_document.; on Oct 12, 2026 (last verified) we confirmed these were the latest versions published. It isn't updated automatically, and there is no API. If you download it again later, you get the version of this list we provide at that time.

Q.What format is it delivered in?

CSV (opens in Excel or Google Sheets). There is no API.