A bill for an act requiring the department of natural resources to identify specific animal sources of pollutants to a water of the state when determining the water’s inclusion on a list of impaired waters.

This bill requires Iowa's Department of Natural Resources (DNR) to identify specific animal sources (like livestock or wildlife) and assign percentage contributions to fecal bacteria pollution before adding a water body to the state's list of impaired waters. It mandates that the DNR conduct microbial source tracking analysis to determine which animal species are responsible for pollution when compiling the federal Clean Water Act's 303(d) list. This directly affects the DNR's process for listing polluted waterways and could influence future pollution reduction efforts targeting specific sources. The requirement applies only when fecal bacteria is the identified pollutant causing impairment.