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Hahn Engineering
Septic Design
County-wide SRHD Listed Design ProfessionalLicense & Verification
We have not matched a Washington State contractor license number to this listing yet. You can look this business up directly using the official state tools below.
Septic installers and pumpers are also listed with the Spokane Regional Health District (SRHD), which verifies permitted contractors by phone at (509) 324-1560. SRHD does not publish searchable license numbers.