Summary: Tariff revision reflecting the increase in the State B&O taxes. On April 1, 2020 the state Business and Occupation tax rate for Service and Other increased from .015 to .0175. The company serves approximately 59,700 residential; 7,800 commercial; and 255 roll-off customers in Thurston county affected by this change. The last general rate increase became effective June 1, 2014.