Aggregate Source Approval

Search our database containing detailed information about companies that provide aggregate for road projects. Find instructions for submitting your aggregate for approval.

Aggregate Source Approval (ASA) database

Search the ASA database for the source(s) that meet your selection criteria. From the resulting list, choose which one you want to examine in greater detail. ASA Testing may take up to 90 days due to heavy workloads.

ASA map

Use the ASA map to manage and tracks aggregate sources in Washington.

  1. Locate sources on the map using the query tab or by manually searching, using latitude and longitude.
  2. Select the source and follow the link to that source’s on-line Aggregate Source Approval report.

Use the 'Information' tab for instructions on Navigation Tools, Coordinate Locator, Layer Controls, Attribute Table Display and Information Tools.

Submitting aggregate for approval

To initiate the submittal process, contact the ASA Engineer at 360-709-5442. Electronic payment can be made through the Materials Evaluation Program (MEP).

Use the WSDOT Recognized Concrete Aggregate Testing Facilities for 1 year ASR (ASTM C1293) (PDF 17KB) to locate a testing facility near you.

We are hiring!

We have a range of positions open across the state - view all current job openings.

Improved access to 98.2 miles of upstream fish habitat

through 15 fish passage projects in 2021.

28% increase in the value of exports and imports 

from $90.2 billion in 2020 to $115.5 billion in 2021.