Minnesota Stormwater-Municipalities regulations & environmental compliance analysis

Minnesota Stormwater-Municipalities: What you need to know

Governing Law and Regulations

Minnesota stormwater permit regulations: Minnesota Rules (MR) 7090.0010 to 7090.3080

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Minnesota Water and National Pollutant Discharge Elimination System (NPDES) program: MR 7001

Municipal separate storm sewer systems (MS4s): MR 7090.1010

Regulatory Agencies

Minnesota Pollution Control Agency (MPCA) Municipal Division Stormwater Section

U.S. Environmental Protection Agency (EPA) Region 5

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. The Minnesota Pollution Control Agency (MPCA) is authorized by the U.S. Environmental Protection Agency (EPA) to administer the federal National Pollutant Discharge Elimination System (NPDES) program in Minnesota, including general permitting authority for stormwater discharges associated with municipal separate storm sewer systems (MS4s). Minnesota follows federal requirements; however, the MPCA has additional requirements. See the national section STORMWATER—MUNICIPALITIES for more information on the federal permitting program.

Administration and enforcement. MPCA's Municipal Division is responsible for the administration and enforcement of the stormwater discharge permit regulations in Minnesota for MS4s.

State Requirements

MS4S

MR 7090.1010

Minnesota's MS4 program requires additional large and medium MS4s in urbanized areas, through the use of NPDES permits, to implement programs and practices to control polluted stormwater runoff. In addition, small- and medium-sized MS4s with populations of between 5,000 and 10,000 must obtain a stormwater discharge permit.

Small MS4s

There are three categories of regulated small MS4s: mandatory, ...


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