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Tacoma Emergency Roofers

Licenses

Who may treat your roof for moss in Washington

Three kinds of crews offer roof moss work in Tacoma: roofers, gutter cleaners and pressure washers. The state license that covers the moss treatment is the same for all three, and it is not the one most homeowners look up.

The moss treatment needs a WSDA license

Washington treats moss control products as pesticides. A WSDA fact sheet says a company needs a license even if it "performs moss control to roofs or lawns, even once." (WSDA)

The license category is Structural and Turf Demossing, defined as control of moss on structures and turf. (WSDA categories)

  • Fee: the commercial applicator license application fee is $250. (WSDA, read Oct 18, 2026)
  • Financial responsibility: a liability policy with $50,000 public liability and $50,000 property damage coverage and a deductible of no more than $5,000, or a surety bond of at least $100,000. (WSDA, read Oct 18, 2026)
  • Crew members: anyone who applies it while working for a licensed company needs a commercial operator license. (RCW 17.21.110) WSDA lists that license at $85, plus a testing fee each time: $25 per paper exam session or $58 per computer exam. (WSDA, read Oct 18, 2026)

Roof repair needs L&I registration

Roofing is a registered contractor specialty: the work that makes the roof surface watertight, including flashing and valleys. (WAC 296-200A-016) Gutter cleaning is on L&I's list of jobs that need no registration. (L&I F625-084-000)

So a gutter crew can clean your gutters without registering, but the moment it sprays moss killer for pay it needs the WSDA license. A roofer who also treats moss needs both.

What to ask before anyone climbs up

  1. What is your WSDA license number, and does it include the demossing category? Look it up on WSDA's license search. WSDA says a search with no result can mean the person or company is unlicensed or inactive, and its line for help is (877) 301-4555. (WSDA)
  2. Who on the crew will apply the product, and does that person hold an operator license?
  3. If you will fix anything on the roof, what is your L&I registration number? Check it on L&I Verify.
  4. Which product will you use? Ask to see the label, since it sets the timing and the warnings.
  5. How will you keep runoff out of the gutters and the storm drain?

Why the runoff question matters

A state Ecology study in Lacey traced 43% of the zinc in local runoff to moss control products. (Ecology)

Next

For storm damage and leaks, read how to hire an emergency roofer in Tacoma. For a repair bid, see what a fair roof repair quote shows.

Sources

We read each source on October 18, 2026. Rules and prices change, so check the linked page before you rely on a number.

  1. WSDA: Attention Landscape Maintenance Companies (AGR PUB 702-556)
  2. WSDA: Pesticide license categories (effective 1/1/2026)
  3. WSDA: Commercial Applicators
  4. WSDA: Commercial Operator license
  5. RCW 17.21.110, commercial pesticide operator license
  6. WSDA: Pesticide and SPI licensing search
  7. WAC 296-200A-016, contractor specialties
  8. L&I publication F625-084-000, What You Should Know About Hiring a Contractor (10-2024)
  9. Washington L&I: Verify a Contractor, Tradesperson or Business
  10. WA Ecology Pub. 17-03-018, copper and zinc in urban runoff (2017)

Written by the Tacoma Emergency Roofers team. We list businesses; we do not employ, bond or insure them. Spot a mistake? Use the claim page to tell us.