The Utilities and Transportation Commission has approved a rate increase for customers of Iliad Water Company, which serves approximately 900 residents on 23 water systems in Clallam, Kitsap, Snohomish, Pierce, King, Island, Jefferson, and Lincoln counties.

The rate changes come as part of a commission order to bring the water rates for all of the company’s 23 water systems into a single pricing structure. The rate changes also incorporate increases in the company’s operating costs and increases in the wholesale cost of water.

The rate increase of $154,065, or 22 percent, is a reduction of the company’s initial request to raise revenue by $244,527, or 34 percent. With the order, the commission also approved a plan that will phase in the rate increase over a six-month period for customers on Iliad Water’s 23 water systems.

Starting May 1, the average residential water customer using 775 cubic feet of water a month in the Sunwood Graham water system in Pierce County will pay $13.71 more, for an average monthly bill of $71.38. On Nov. 1, the average Sunwood Graham bill will increase to $77.38.

Starting May 1, the average residential water customer using 775 cubic feet of water a month across Iliad Water’s 22 other water systems will pay $20.71 more, for an average monthly bill of $78.38. On Nov. 1, the average bill across these 22 water systems will decrease to $77.38.

The company’s last rate change, a revenue increase of approximately $24,000 (3.9 percent) due to increased wholesale water costs, went into effect July 1, 2018.