Washington certifies plumbers under RCW 18.106. A business that contracts with the public for that work also registers with the Department of Labor and Industries under RCW 18.27. Look the Spokane company up on L&I's Verify tool and confirm the certificate covers the job. The city still controls the plumbing permit, so ask who will pull it. This page shows which Spokane plumbers AI assistants named most often across answers RecommendRadar ran and stored, how often each appeared, and the sources those answers cited. Visibility to AI isn't the same as good work, so ask for the certificate and confirm it.
5 snapshot runs from the last 45 days named a business. This page is indexed after 3 such runs. Names that differ by case, punctuation, a leading The, a practice suffix, or a shortened firm name are combined.
Before you contact anyone on this list
- Ask which license covers this job and match it to the price.
- Ask who will pull the building permit.
- Get a written quote before work starts.
FAQ
Do plumbers need a certificate in Washington?
Yes. RCW 18.106 covers plumber certification, and a business that sells the work to the public also registers as a contractor under RCW 18.27.
How do I check a Spokane plumber?
Use L&I's Verify tool, then ask which certificate number will be on the city permit.
Which Spokane plumbers did AI name most?
Cole's Plumbing (5 of 5), Shaw Plumbing Heating & Air Conditioning (5 of 5), Action Drain & Plumbing (4 of 5), Bulldog Rooter (2 of 5), Mr Rooter Plumbing of Spokane (2 of 5), Pace Plumbing & Heating (2 of 5)
How this page works
Every name, count, and source on this page comes from answers RecommendRadar ran and stored for the best plumber in Spokane, WA. Nothing is added or edited by hand. These stored answers came from Perplexity and ChatGPT. Sample: 5 stored answers from the last 45 days, refreshed October 25, 2026. AI answers vary with wording, time, location, and engine, so this is a dated sample of what those engines said, not an endorsement or a ranking of quality.