Iowa DNR
Iowa DNR
ADBNet
Water Quality Assessments
Impaired Waters List

2022 Impaired Waters Map

Category 5
The State's Section 303(d) list of impaired waters. The waterbody is impaired and a total maximum daily load (TMDL) is needed.
Category 4
The waterbody is impaired but a TMDL is not required or a TMDL has already been completed. The waterbody is not included on the State’s section 303(d) list of impaired waters.