RCW 58.17.120Disapproval due to flood, inundation or swamp conditions—Improvements—Approval conditions.The city, town, or county legislative body shall consider the physical characteristics of a proposed subdivision site and may disapprove a proposed plat because of flood, inundation, or swamp conditions. Construction of protective improvements may be required as a condition of approval, and such improvements shall be noted on the final plat.No plat shall be approved by any city, town, or county legislative authority covering any land situated in a flood control zone as provided in chapter 86.16 RCW without the prior written approval of the department of ecology of the state of Washington.[ 1974 ex.s. c 134 s 6; 1969 ex.s. c 271 s 12.]
Washington Legal Code