Contact us: On-site wastewater treatment

Contact information

Telephone: (360) 664-1575
Fax: (360) 664-2551
Email: engineers@dol.wa.gov

Office hours

Monday through Friday
8 a.m. to 5 p.m.

Physical location

405 Black Lake Boulevard SW, 2nd floor
Olympia, WA 98502

Map and driving directions

Mailing address

Forms with payments:

On-site Designer Licensing Program
Board of Registration for Professional Engineers and Land Surveyors
Department of Licensing
PO Box 9048
Olympia, WA 98507-9048

Letters with no payments:

On-site Designer Licensing Program
Board of Registration for Professional Engineers and Land Surveyors
Department of Licensing
PO Box 9025
Olympia, WA 98507-9025

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