RCW 80.28.050: Tariff schedules to be filed with commission—Public schedules.

Every gas company, electrical company, wastewater company, water company, and thermal energy company shall file with the commission and shall print and keep open to public inspection schedules in such form as the commission may prescribe, showing all rates and charges made, established or enforced, or to be charged or enforced, all forms of contract or agreement, all rules and regulations relating to rates, charges or service, used or to be used, and all general privileges and facilities granted or allowed by such gas company, electrical company, wastewater company, water company, or thermal energy company.