A 1987 amendment to the federal Clean Water Act required implementation of a two-phase comprehensive national program to address storm water runoff. Phase I focused on large construction sites, 11 categories of industrial facilities, and major metropolitan municipal separate storm sewer systems.
In March of 2002, Phase II was implemented and is the next step in an effort to preserve, protect and improve water resources impacted by storm water runoff. The program has broadened to include smaller construction sites, certain industrial sites, and smaller municipal separate storm sewer systems. Phase II is designed to further reduce adverse impacts to water quality and puts controls on runoff that have the greatest likelihood of causing continued environmental degradation.
The storm water regulations are part of the National Pollutant Discharge Elimination System (NPDES) permit program. The U.S. Environmental Protection Agency (EPA) delegated permitting authority for Minnesota's NPDES program to the MPCA. The three permit types - construction, industrial, MS4 - each have distinct requirements.
The Storm Water Pollution Prevention Program was created to satisfy the requirements of the General Permit and serve the City of Bloomington by providing a framework of programs and practices to control storm water runoff from the city's jurisdiction.