Iowa Department of Natural Resources
Attn: Section 401 Water Quality Certification
6200 Park Ave Ste. 200
Des Moines, IA 50321
Email: Section401WQC@dnr.iowa.gov
U.S. Department of the Army Corps of Engineers, Rock Island District
Clock Tower Building – PO BOX 2004
Rock Island, IL 61204-2004
Phone: 309-794-5057
Email: iowaregulatory@usace.army.mil
U.S. Department of the Army Corps of Engineers, Omaha District
8901 South 154th Street
Omaha, NE 68138-3611
Phone: 402-896-0896
Email: NE404Reg@usace.army.mil