| Business | Phone |
| Roto-Rooter Plumbing & Drain Friday Harbor 98250 | (360) 378-7760 |
| San Juan Plumbing 24 Lookout Hill Rd, Friday Harbor 98250 | (360) 378-8657 |
| San Juan Septic Svc 1240 San Juan Valley Rd, Friday Harbor 98250 | (360) 378-7255 |
| San Juan Septic Svc 538 Timber Ln, Friday Harbor 98250 | (360) 378-5045 |
| Northwest Plumbing & Waterwork 528 Chinook Way, Friday Harbor 98250 | (360) 378-3985 |
| Friday Harbor Plumbing Co 1064 San Juan Valley Rd, Friday Harbor 98250 | (360) 378-2490 |
| Inter-Island Plumbing 1385 Beaverton Valley Rd, Friday Harbor 98250 | (360) 378-2223 |
| Local Plumber Po Box 31, Friday Harbor 98250 | (360) 378-4324 |