Iowa Code Title XI. Natural Resources [Chs. 455-485] § 455B.186. Prohibited actions

1. A pollutant shall not be disposed of by dumping, depositing, or discharging such pollutant into any water of the state, except that this section shall not be construed to prohibit the discharge of adequately treated sewage, industrial waste, or other waste in accordance with rules adopted by the commission. A pollutant whether treated or untreated shall not be discharged into any state-owned natural or artificial lake except as authorized in subsection 2.

2. Subsection 1 shall not be construed to prohibit the use or application of a pesticide in accordance with the federal Insecticide, Fungicide, and Rodenticide Act, 7 U.S.C. § 136 et seq. However, an aquatic pesticide shall not be applied to any water of the United States except as authorized in accordance with rules adopted by the commission.