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BACKFLOW SPECIALTY — Washington

68 records carry this specialty in L&I's records, as of November 3, 2026. Pick a city to see them.

Source: Washington State Department of Labor & Industries (L&I) — records as of November 3, 2026. Records change; the board’s own L&I Verify a Contractor is the current source.

• Everett
  4 records
• Tacoma
  4 records
• Seattle
  3 records
• Puyallup
  3 records
• Kirkland
  2 records
• Lynnwood
  2 records
• Tukwila
  2 records
• Kent
  2 records
• Gig Harbor
  2 records
• Bremerton
  2 records
• Port Angeles
  2 records
• Chelan
  1 records
• Snohomish
  1 records
• Oak Harbor
  1 records
• University Pl
  1 records
• Bellingham
  1 records
• Marysville
  1 records
• East Wenatchee
  1 records
• Cle Elum
  1 records
• Kennewick
  1 records
• Mountlake Terrace
  1 records
• Ontario
  1 records
• Malott
  1 records
• Lake Forest Park
  1 records
• Lacey
  1 records
• Kingston
  1 records
• Colbert
  1 records
• Pasco
  1 records
• Bellevue
  1 records
• Colville
  1 records
• Blaine
  1 records
• Lake Stevens
  1 records
• Aberdeen
  1 records
• Maple Falls
  1 records
• South Prairie
  1 records
• Shoreline
  1 records
• Bingen
  1 records
• Pacific
  1 records
• Granite Falls
  1 records
• Cashmere
  1 records
• Tumwater
  1 records
• Spanaway
  1 records
• Mercer Island
  1 records
• Richland
  1 records
• West Richland
  1 records
• Redmond
  1 records
• Des Moines
  1 records
• Saint Paul
  1 records
• Bothell
  1 records
• Issaquah
  1 records
• Sequim
  1 records