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State Materials Laboratory
1655 S 2nd Ave
Tumwater, WA
98512-6951

Page maintained by:
Shannon Huber

Aggregate Source Approval (ASA)

The Aggregate Source Approval database stores detailed information about companies
that provide aggregate for road projects. You may search the database for the source or sources that meet your selection criteria. From the resulting list, choose which one you want to examine in greater detail.

Questions, comments, or requests?

Please contact our office: 

Matthew Johnson
360-709-5444

Maha Ablson
QPL Engineer 
360-709-5403

Rob Molohon
Materials Quality Assurance Engineer 
360-709-5441