Mason County adopted a series of ordinances in June 2008 aimed at improving stormwater management. 

One significant regulatory improvement came from the adoption of the 2005 edition of Ecology’s Stormwater Management Manual for Western Washington, to be gradually applied in a phased approach and eventually used county-wide by June 2012.  (Those areas not covered by the 2005 Manual are subject to the 1992 Manual.)

A second regulatory improvement came with the adoption of the Low Impact Development
(LID) ordinance that is applicable to the Belfair and Allyn Urban Growth Areas.

Complete ordinances can be found here:

• Stormwater and Surface Water Utility Ordinance 80-08
• Stormwater Management Ordinance 81-08
• Low Impact Development (LID) Ordinance 76-08

In addition to County stormwater requirements, the Department of Ecology also requires permits for certain types of development.  You can learn more about Ecology permits here:

• Construction Permit
• Industrial Permit

More about Ecology’s 2005 Stormwater Manual

More about Low Impact Development (LID):

• http://www.psp.wa.gov/stormwater.php
• 2005 LID Manual