RCW 90.03.510: Stormwater control facilities—Imposition of rates and charges—Credit for other improvements.

Whenever a county, city, town, water-sewer district, or flood control zone district imposes rates or charges to fund stormwater control facilities or improvements and the operation and maintenance of such facilities or improvements under RCW 35.67.020, 35.92.020, 36.89.080, 36.94.140, 57.08.005, or 57.08.081, it may provide a credit for the value of stormwater control facilities or improvements that a person or entity has installed or located that mitigate or lessen the impact of stormwater which otherwise would occur.