Stormwater runoff is a major source of pollutants as it is carried by the stormwater system (gutters, storm drains, and ditches) to local waterways. This runoff can significantly contribute to violations of water quality standards for specific pollutants during storms. While much of the storm-generated pollution is runoff from private homes, lawns, and streets; runoff from industrial or manufacturing activities as well as construction sites are also a major sources of pollution.

Runoff from private homeowners is not typically covered under any type of program or permit, however, runoff from industrial, manufacturing and construction activities does fall under both federal EPA and Iowa Department of Natural Resources (IDNR) regulations through the Clean Water Act. Applicable businesses must obtain a stormwater discharge permit which also includes the development of a stormwater pollution prevention plan.

As of June 2012, IDNR accepts online applications for storm water discharge permits. Learn more here.


IWRC Resources
  • Technical Assistance
    • IWRC offers resources related to stormwater at no charge to Iowa small businesses. Our environmental specialists can answer any questions or a specialist can even visit your facility to conduct a free on-site review of your facility’s operations which include evaluating your environmental compliance status and providing waste reduction initiatives.
  • Stormwater Discharge Permits
    • Want to know more about stormwater discharge permits? Check out this Q&A that covers the basics including the different classes of activities that require a permit, what businesses must operate with a permit, development of a stormwater pollution prevention plan as well as monitoring and reporting requirements.
  • Regulatory Summaries
    • IWRC's environmental specialists have provided easy-to-understand information about stormwater in Regulatory Summaries.