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*[https://mpca.maps.arcgis.com/apps/webappviewer/index.html?id=8d310e604baa43699b25395834d0c69a MS4 mapping tool] is an interactive online map tool that can be used to view and explore MS4 boundaries, defined urban areas, impaired waters, outstanding resource value waters, trout waters and approved TMDL study areas. | *[https://mpca.maps.arcgis.com/apps/webappviewer/index.html?id=8d310e604baa43699b25395834d0c69a MS4 mapping tool] is an interactive online map tool that can be used to view and explore MS4 boundaries, defined urban areas, impaired waters, outstanding resource value waters, trout waters and approved TMDL study areas. | ||
*[https://www.pca.state.mn.us/water/municipal-stormwater-ms4#guidance-and-bmps-da807a70 MPCA MS4 website] for additional guidance documents and fact sheets. | *[https://www.pca.state.mn.us/water/municipal-stormwater-ms4#guidance-and-bmps-da807a70 MPCA MS4 website] for additional guidance documents and fact sheets. | ||
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+ | [[Category:Level 3 - Regulatory/Municipal (MS4)/Guidance, outreach materials, miscellaneous information]] | ||
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Only certain MS4s in Minnesota are subject to stormwater regulation under the Clean Water Act and Minnesota Rule 7090. The MPCA regulates the following:
Owners or operators of MS4s that meet the above criteria must submit an MS4 General Permit to the MPCA. Under the permit, the owner or operator is required to reduce the amount of sediment and pollution carried from stormwater to surface and ground water to the maximum extent practicable. Additionally, the permit requires the system owner or operator to develop a stormwater pollution prevention program (SWPPP) that incorporates best management practices (BMPs) most appropriate to their MS4.
Note: The cities of Minneapolis and St. Paul are Large MS4s (population of 250,000 or more) and received reissued individual NPDES/SDS permits on January 21, 2011.