Iowa DNR
Iowa DNR Fish Kill Database
The Iowa DNR Fish Kill Database stores the data for fish kills in the state. The primary function of this database application is to track causes and locations of fish kills for the purposes of assessing Iowa's water quality.

The Integrated Report, which combines federal requirements for state Section 305(b) water quality assessments and Section 303(d) impaired waters listings, required the Iowa Department of Natural Resources Watershed Monitoring and Assessment Section to begin tracking fish kills. A fish kill can affect the 305(b) water quality assessment of the waterbody and can potentially result in the addition of the water body to the 303(d) list of impaired waters.

Fish Kill Reporting

If you believe a fish kill has occurred, immediately contact the nearest Iowa DNR Field Office or Fisheries Office.

You should have available the name of the stream, the location of the kill, and any other conditions or observations that may aid in the investigation of the cause and source of the kill.

Do not touch the water or remove any dead fish.

515-725-8694

24-hour Environmental Reporting Hotline

Recent Additions
Unnamed Tributary to Little Cedar River - 4/23/2020 - Animal Waste
2 weeks ago
Bloody Run Creek - 4/20/2020 - Unknown
over a month ago
Spencer Creek - 7/6/2018 - Unknown
2 months ago
Spirit Lake - 8/13/2018 - Cyanobacteria Bloom
2 months ago
Floyd River - 8/18/2018 - Unknown
2 months ago
Richmond Springs and Fenchel creek - 9/28/2019 - Unknown - Anthropogenic Suspected
8 months ago
Unnamed Tributary to Burr Oak Creek - 9/17/2019 - Unknown
8 months ago
Little Bear Creek - 9/11/2019 - Animal Waste
8 months ago
Hardin Creek - 8/18/2019 - Unknown
9 months ago
Little Maquoketa River - 8/9/2019 - Unknown
9 months ago
Private Farm Pond - 7/8/2019 - Environmental
9 months ago
White Breast Creek - 8/7/2019 - Wastewater
9 months ago
Unnamed Tributary to Turkey River and Vernon Springs Impoundment - 8/13/2019 - Unknown - Anthropogenic Suspected
9 months ago
Unnamed Tributary to Beaver Creek - 7/30/2019 - Pesticides/Herbicides
10 months ago
Deer Creek - 7/25/2019 - Pesticides/Herbicides
10 months ago
Walnut Creek - 7/25/2019 - Chlorinated Water
10 months ago
Unnamed Tributary to Shell Rock River - 7/25/2019 - Unknown - Anthropogenic Suspected
10 months ago
Cedar Springs Development Retention Pond - 7/17/2019 - Unknown - Natural Suspected
10 months ago
Unnamed Tributary to Little Maquoketa River - 3/25/2019 - Animal Waste
14 months ago
Unnamed Tributary to Floyd River - 5/31/2018 - Ammonia/Fertilizer
14 months ago
Mississippi River - 5/30/2018 - Environmental
14 months ago
Stormwater Containment Structure - 6/16/2017 - Environmental
14 months ago
Unnamed Tributary to Wapsipinicon River - 9/28/2016 - Animal Waste
14 months ago
Winnebago River - 7/16/2008 - Environmental
14 months ago
Unnamed Tributary to North Fork Floyd River - 7/16/2008 - Pesticides/Herbicides
14 months ago
Private Pond - 9/19/2007 - Unknown - Natural Suspected
14 months ago
West Branch Little Floyd River - 8/19/2007 - Animal Waste
14 months ago
Private Lake - 8/6/2007 - Unknown
14 months ago
Unnamed Lake - 3/22/2007 - Environmental
14 months ago
Private Pond - 6/24/2015 - Environmental
14 months ago

Fish Kills and Water Quality Assessments

As described in Iowa DNR's current methodology for water quality assessments, occurrence of a single pollutant-caused fish kill, or a fish kill of unknown origin, on a waterbody or portion of a waterbody during the most recent three-year period indicates an impairment of the aquatic life uses.

Each report of a fish kill will be reviewed to determine whether development of a TMDL is appropriate. In the absence of an ongoing source of a pollutant, TMDLs will not be developed for kills caused by a one-time illegal or unauthorized release of manure or other toxic substance. Impacts from this type of fish kill are addressed through IADNR's enforcement procedures. Fish kills attributed to authorized discharges (i.e., a discharge meeting permit limits) are considered for Section 303(d) listing as the existing, required pollution control measures are not adequate to address this impairment.