Washington does NOT maintain a separate state Do Not Call list — the federal NDNC is the only list. Washington DOES require telemarketer registration and licensing through the Department of Licensing before conducting business (no advance timeframe, just before commencing). A bond or letter of credit is required. Washington's Commercial Telephone Solicitation Act (RCW 19.158) governs telemarketing practices. Telemarketers must provide their registration number upon request and inform purchasers of cancellation rights. Repeated violations: consumers can seek injunction and/or damages (minimum $1,000 per violation plus attorney fees). Telemarketers' rights are also overseen by the Utilities and Transportation Commission (UTC).