Iowa DNR

Water Quality Assessments

Impaired Waters List


Iowa’s List of Waters in Need of Further Investigation

The list of waters in need of further investigation (WINOFI), as required by Iowa’s “credible data law”, is comprised of those waterbodies assessed as “potentially impaired” and placed in Integrated Report Category 3b. As stated in the rationales for subcategory 3b, the assessment of any impairment in these waterbodies was based on less than complete information that suggests only a potential impairment. Thus, the assessments are of relatively low confidence and are not appropriate for addition to Iowa’s impaired waters list. When reporting these waterbodies to the US EPA, these waters are considered "Not Assessed".

This page was created 4/17/2017 2:04:55 PM and was last updated 4/2/2020 8:49:34 AM