An Urban Storm Water Program (MS4 Permit)


On October 28, 2014, the Wisconsin Department of Natural Resources (DNR) formally notified Washington County on their determination that the county owns or operates a municipal separate storm sewer system that requires coverage under a WPDES permit. This notice required the county to submit a Notice of Intent which was submitted January 23, 2015. On March 6, 2015 Washington County was issued a WPDES MS4 Permit requiring the county to implement a storm water management program and control measures to improve urban water quality. Thus the March 6, 2015 date is recognized as the start date for the compliance schedule discussed later.

The MS4 permit requires the county develop a Storm Water Management Program that includes information and education of the public, involvement and participation of the public, illicit discharge detection and elimination, creation and enforcement of local ordinances to regulate erosion control and long-term storm water management, and implementation of pollution prevention at municipally-owned facilities.