Iowa Stormwater-Municipalities regulations & environmental compliance analysis

Iowa Stormwater-Municipalities: What you need to know

Governing Law and Regulations

National Pollutant Discharge Elimination System (NPDES) permit program: Iowa Administrative Code (IAC) 567-64.13(455B) to 567-64.16(455B)

Regulatory Agencies
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Iowa Department of Natural Resources (DNR)Environmental Protection DivisionWater Quality BureauStormwater Program

U.S. Environmental Protection Agency (EPA)Region 7

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Iowa has been delegated authority by the U.S. Environmental Protection Agency (EPA) to administer the federal National Pollutant Discharge Elimination System (NPDES) permit program, including authorization to issue permits for municipal separate storm sewer systems (MS4s). The state issues individual permits to those cities and universities in the state that require permit coverage and generally follows the federal MS4 permitting requirements. See the national section STORMWATER—MUNICIPALITIES for more information about federal permitting requirements.

Administration and enforcement. The Stormwater Program under DNR's Water Quality Bureau administers the NPDES stormwater MS4 permitting requirements in Iowa.

State Requirements


Iowa has established a list of cities and universities in the state that are required to obtain individual stormwater discharge permits for their MS4s. The determination of which cities and universities are required to obtain MS4 permits involves a combination of population; proximity to large, urbanized areas; and the water quality of receiving streams. MS4 permits require permittees to implement measures to:

  • Reduce pollutants in stormwater from illicit ...

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