DOWL, LLC
Billings,
Montana
View Accreditation Certificate
Cade
Cunningham
223 North 33rd Street
Billings
,
Montana
59101
Phone: (406) 869-6311
Fax:
ccunningham@dowl.com
http://www.dowl.com
Quality Management System - accredited since 12/17/2021
R18, C1077 (Aggregate), C1077 (Concrete), D3666 (Aggregate), D3740 (Soil), E329 (Aggregate), E329 (Concrete), E329 (Soil)
Soil - accredited since 12/17/2021
D698, D1557, D2216, D4318, D4718
Aggregate - accredited since 12/17/2021
C117, C127, C128, C136, C702
Concrete - accredited since 12/19/2022
C31 (Cylinders), C39, C138, C143, C172, C231, C511, C617 (9000 psi and below), C1064, C1231 (7000 psi and below)
Please note that our accreditations do not include an expiration date. An accreditation only expires when the laboratory fails to comply with our accreditation requirements.
* This information is only valid as of 10/27/2026. Please visit https://aashtoresource.org for current accreditation status.
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