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BACKFLOW SPECIALTY in Seattle, WA

3 records with this specialty and Seattle as their locality of record, from the L&I contractor licensing datasets (data.wa.gov), file dated November 3, 2026.

Source: Washington State Department of Labor & Industries (L&I) — L&I contractor licensing datasets (data.wa.gov), file dated November 3, 2026. Records change; the board’s own L&I Verify a Contractor is the current source.