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Permeable pavement in this parking lot helps rainwater soak into the ground instead of running off.Storm water runoff is the rainfall or snowmelt that runs off permeable surfaces or impervious surfaces like roads, buildings, sidewalks or compacted ground surfaces.

Storm water can flow directly to streams and lakes or it may be transported by municipal storm drain systems. Unlike sanitary sewers, storm sewers do not lead to treatment plants, but drain directly into our streams and lakes. 

And according to a six year study conducted by EPA, urban storm water contains concentrations of pollutants that are equal to or larger than non-urban runoff.

As communities grow, they often experience more storm water runoff problems due to their increasing impervious surface areas. Rainfall and snowmelt that would normally infiltrate into the soil becomes runoff. This increases both the volume and rate of runoff, which leads to flooding, streambank erosion, and potential damages to public and private property and water quality.

The Iowa Department of Natural Resources is working in a variety of ways to improve storm water quality. Certain activities and specific municipalities and universities must obtain permits with requirements that are intended to reduce the impact of storm water on our lakes and streams. In addition, DNR and its partners have developed a number of storm water "tools" to assist developers, builders, cities and individual Iowans.

Financial Assistance

Manuals and Brochures

Storm water Regulations and Permitting

Storm water DVD Series
Learn how storm water runoff can affect water quality and what you can do to help.

Other Storm water Resources

DNR Contacts
Storm water regulation issues:
Joe Griffin