Washington Revised Code Title 82. Excise Taxes § 82.02.100. Impact fees--Exception, mitigation fees paid under chapter 43.21C RCW

(1) A person required to pay a fee pursuant to RCW 43.21C.060 for system improvements shall not be required to pay an impact fee under RCW 82.02.050 through 82.02.090 for those same system improvements.

(2) A person installing a residential fire sprinkler system in a single-family home shall not be required to pay the fire operations portion of the impact fee. The exempted fire operations impact fee shall not include the proportionate share related to the delivery of emergency medical services.