Iowa DNR

Water Quality Assessments

Impaired Waters List

Assessment Process

Lakes and stretches of streams and rivers in Iowa each have specific designations, based on what they are used for—recreation, such as swimming or fishing; drinking water; or maintaining a healthy population of fish and other aquatic life. Every two years, Iowa must report on its progress in meeting water quality goals to the U.S. Environmental Protection Agency. The state prepares a report, called the 305(b) assessment, that shows how well Iowa waters are meeting those goals. The report includes waters that meet the designated uses, waters that we need more information about and waters that are impaired.

Preparation of Iowa’s integrated report includes the following basic steps:

Current and previous Integrated Report methodology documents can be found on the Publications page.

This page was created 5/26/2020 10:44:44 AM and was last updated 6/8/2020 2:44:06 PM