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3/18017 Municipal stormwater (MS4) I Minnesota Pollution Control Agency is required to develop a stormwater pollution prevention program (SWPPP) that incorporates best management practices (BMPs) applicable to their MS4. See the following fact sheet for additional information: • ® MS4 Stormwater Program Overview (wq-strm4-01) What criteria make an MS4 subject to stormwater regulation? Only certain MS4s in Minnesota are subject to stormwater regulation under the Clean Water Act and Minnesota Rule 7090. The MPCA regulates the following: 1. An MS4 located fully or partially within an urbanized area as determined by the latest Decennial Census and owned or operated by a publicly owned entity that has the potential resident capacity, bed count occupancy, or average daily user population of 1,000 or more. 2. The entire jurisdiction of a city or township that is located fully or partially within an urbanized area as determined by the latest Decennial Census and owns or operates an MS4. 3. An MS4 owned or operated by a municipality with a population of 10,000 or more. 4. An MS4 owned or operated by a municipality with a population of at least 5,000 and discharges or has the potential to discharge stormwater to one of the following: a. A water identified as an outstanding resource value water as identified in Minn R. 7050.0180, subparts 3 and 6. b. A water identified as a trout lake or trout stream as identified in Minn. R. 6264.0050, subparts 2 and 4. c. A water listed as impaired under section 303(d) of the Clean Water Act, 33 U.S.C. § 1313. Minnesota state rule (Minn. R. 7090) establishes criteria that can be applied to designate future MS4s under a formal process. MS4s designated through this process are required to obtain a NPDES/SDS stormwater permit. The public can petition the Commissioner of the MPCA for the designation of an MS4 based on the criteria established in Minn. R. 7090.1010 subpart 3. 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. Visit the Stormwater Program Rulemaking Web page for further details. MS4 Mapping Tool MS4 mapping tool:This is an interactive electronic map too( 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. Note: This is best viewed with pop-up blockers disabled and screen resolution set to 1024768 or higher. 6A Guidance Document: Use of the MS4 Mapping Tool Impaired waters and TMDLs MS4 Permittees with assigned Waste Load Allocations (WLA) as part of a Total Maximum Daily Load (TMDL) project approved by US EPA prior to the effective date of the latest Permit reissuance must address additional information in their Stormwater Pollution Prevention Program (SWPPP). Permittees must develop a compliance schedule that outlines interim milestones it will achieve during the permit term, strategies for continued implementation beyond the permit term, and target dates to achieve the applicable WLAs. Impaired Waters List Stormwater and Impaired Waters Final TMDLs and Implementation Plans httpsJ/www.pmstele.mn.us/water/muNcipW-stormwaier-ms4 3 ?J2