The Iowa DNR 2022 Assessment Summary listed 751 rivers, streams, lakes, reservoirs and wetlands across the state fail to meet state requirements for one or more functions, such as supporting aquatic insects and fishing or recreational use, including swimming and boating [There are 783 "Category 5 - Water is impaired or threatened" records in the DNR "[List of Impaired Waters](https://programs.iowadnr.gov/adbnet/Assessments/Summary/2022/Impaired" database.

2022 Assessment Summary - Category 5 - Water is impaired or threatened https://www.iowadnr.gov/environmental-protection/water-quality/water-monitoring/impaired-waters

"Draft 2022 Impaired Waters List." AKA "Category 5" of Iowa’s 2022 Integrated Report.
https://programs.iowadnr.gov/adbnet/Assessments/Summary/2022/Impaired

"2022 Impaired Waters Map."
{https://programs.iowadnr.gov/adbnet/Assessments/Summary/2022/Impaired/Map](https://programs.iowadnr.gov/adbnet/Assessments/Summary/2022/Impaired/Map)

ADBNet - Iowa DNR's Water Quality Assessment database
"2022 Assessment Summary - Category 5 - Water is impaired or threatened and a TMDL is needed 303(d) List of Impaired Waters" https://programs.iowadnr.gov/adbnet/

Related: Iowa DNR - Animal Feeding Operations.
https://www.iowadnr.gov/Environmental-Protection/Animal-Feeding-Operations

Related: Iowa DNR: "Nutrient Reduction Strategy"
https://www.iowadnr.gov/Environmental-Protection/Water-Quality/Nutrient-Reduction-Strategy