On December 13, 2002 (with a technical correction on December 20), Jefferson County adopted the Stormwater Management Manual for Western Washington, issued by the Washington State Department of Ecology in August 2001 and updated in February 2005 and August 2012, as the set of stormwater management standards for all new development and redevelopment in Jefferson County. The 2012 Manual replaces the previously utilized 2001/2005 version and 1992 Ecology stormwater manual.

• DCD Memorandum on Revised Jefferson County Stormwater Management Standards

Section JCC 18.30.070 of the Unified Development Code (UDC) describes Jefferson County's stormwater management standards and regulations.

Implementation Delay

On February 10, 2003, the Board of County Commissioners (BOCC) adopted an ordinance delaying implementation of the 2001 Ecology Stormwater Management Manual for Western Washington (2001 Manual) until July 1, 2003. The delayed implementation was in order to establish a transition period for County staff and the public to prepare more thoroughly for the switch from the 1992 Manual to the 2001 Manual.

• Ordinance Number 02-0210-03, approved and adopted February 10, 2003.