Mold Removal in Snohomish, WA

The record flood

On December 11, 2025, the Snohomish River crested at 34.15 feet, above the 1990 record of 33.5 feet. Floodwater reached homes on Lincoln Avenue, where people had to be rescued. Pilchuck Park and the Stocker Soccer Fields flooded, and the Avenue D bridge and Airport Way closed. Snohomish County had declared a state of emergency on December 9 as moderate to major flooding hit the Snohomish, Skykomish and Stillaguamish rivers. The county health department warned afterward that mold begins forming within one to two days of flooding.

Old houses, slow drying

Snohomish sits on the north bank of the river near where the Pilchuck joins it, about 23 miles from Seattle. Its downtown and older residential core form the Snohomish Historic District, listed on the National Register and known for antique shops. Old homes here can have plaster walls, balloon framing that lets moisture travel between floors, shallow crawl spaces and patched roofs. A flood or a long-running leak in a house like that takes careful work: wet plaster and old framing dry slowly, and tearing out more than needed can harm historic features. Ask the company you hire how it plans to dry and preserve what can be saved.

• Remove soaked insulation, carpet and pad promptly; EPA says porous materials that stay moldy may have to be thrown out.
• Open wall cavities where water sat, so framing can dry.
• Wear an N95 mask, waterproof boots and heavy gloves for cleanup, as the county health department advised.

Permits and local contacts

City of Snohomish Planning & Development Services issues land use, construction and engineering permits from City Hall on Union Avenue, and its Planning department keeps a Flood Insurance Rate Maps page. Snohomish County has adopted updated FEMA digital flood maps covering river and coastal hazards. Rebuilding after flood damage often needs a permit even though the mold cleanup itself does not. The city's Code Enforcement, also in Planning & Development Services, takes complaints through its Code Violation Complaint Form; renters should give the landlord written notice of leaks first.

The Snohomish County Health Department does not investigate mold in private residences or test mold, and it points landlord mold disputes to the Dispute Resolution Center of Snohomish and Island Counties.

Hiring help

Your call goes to an independent local company. Washington has no state mold license or certification, so check the company's L&I construction contractor registration on the Verify a Contractor tool and get the plan in writing, including how the company will confirm the structure is dry before walls are closed up again.