Sites disturbing one acre or more need erosion and sediment controls under Iowa DNR's construction stormwater permit and its SWPPP. Silt fence and quick stabilization keep soil out of the Iowa River and Clear Creek.
The Stormwater Pollution Prevention Plan required by Iowa DNR's construction permit is where erosion control lives. A builder in Iowa City, Coralville, North Liberty, Tiffin, or the unincorporated county must install and maintain silt fence, stabilized construction entrances, sediment traps, inlet protection, and prompt seeding or mulching of bare soil. On the county's rolling loess and river-valley ground, loosened soil moves fast toward Clear Creek, the Iowa River, and Coralville Reservoir, so exposed areas must be stabilized without delay. Controls stay in place until the site reaches final stabilization, and local MS4 inspectors check them during construction.
Clearing an acre without erosion controls, or letting silt fence fail so sediment reaches a creek or the river, brings Iowa DNR penalties, stop-work orders, and daily fines until the site stabilizes.
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See how Johnson County's erosion control rules stack up against other locations.
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