Sub Finder · San Juan County
Duncan Plumbing Company LLC
From public license list
- License
- Washington plumbing contractor (L&I) · L&I DUNCAPC745ON Active
- Location
- Friday Harbor · San Juan County
Source: Washington L&I contractor license data (data.wa.gov), retrieved 2026-10-30. This listing shows only public license data. It has not been reviewed by the business.