WAC 480-70-236. Tariffs, all companies must file tariffs and must comply with the provisions of approved tariffs

(1) No company may provide solid waste collection service until it files, and the commission approves, a tariff. (2) No company may assess rates and charges for solid waste collection service that are higher, lower, or different from those contained in its approved tariff. (3) No company may accept a payment for service provided that is higher, lower, or different from the rates and charges contained in its approved tariff.