Per the City of Renton's National Pollutant Discharge Elimination System (NPDES) permit, it is required to adopt updated surface water design standards that are equivalent to portions of Volume 1 of the 2012 Stormwater Management Manual for Western Washington, as amended in 2014, by December 31, 2016.
The 2016 King County Surface Water Design Manual has been approved by the Department of Ecology as an equivalent manual. To comply with the City of Renton's NPDES permit requirement, the city adopted the 2016 King County Surface Water Design Manual with Amendments to create the 2017 City of Renton Surface Water Design Manual.
The 2017 City of Renton Surface Water Design Manual is only applicable to projects vested with a complete application after January 1, 2017.