Impaired Waters and Total Maximum Daily Loads (TMDLs)



The federal Clean Water Act requires states to prepare a list of impaired surface waters every even numbered year. These waters do not support their assigned beneficial uses as listed in Title 117 – Nebraska Surface Water Quality Standards. From this list, referred to as the 303(d) List of Impaired Waters, states prepare Total Maximum Daily Loads (TMDLs) that include the pollution control goals and strategies necessary to improve the quality of these waters and remove the identified impairments. NDEQ is also required to provide a surface water quality report every two years, known as the Section 305(b) Water Quality Report, which describes the status and trends of existing water quality for all waters of the state and provides information as to the extent to which designated uses are supported.

The Integrated Report
Combining the 303(d) List of Impaired Waters, and the 305(b) Water Quality Report

The Integrated Report is a combination of these two federally-required bi-annual reports: the Section 303(d) list of impaired waters and the Section 305(b) water quality report. EPA guidance recommended combining the two reports in order to better provide the general public with a comprehensive summary of surface water quality. The Integrated Report provides the general public information of the status of the State’s waters and also allows for future water quality management planning (future monitoring, TMDL development, watershed improvement implementation). Category 5 is the Section 303(d) list that is subject to EPA approval or disapproval.

Below are links to the most recent Integrated Reports.

2012 Surface Water Quality Integrated Report
2010 Surface Water Quality Integrated Report

What is a TMDL (Total Maximum Daily Load)?
A TMDL is a calculation or equation that is used to determine the maximum amount of a pollutant that a waterbody (stream of lake) can receive and still achieve the assigned water quality goals. TMDLs will often identify pollutant sources and reductions necessary. For more detailed information, go to
Questions and Answers About Nebraska’s TMDL Program.

The following links provide a list of all finalized and approved TMDLs in Nebraska. To view draft TMDL's that are currently open for public comment go to the TMDL category in Public Notices.

TMDLs

Following are links to maps that show impaired rivers and lakes in Nebraska, (statewide and regional):

Statewide Map: Nitrates, Impaired Lakes and Streams

Other links:

Title 117 – Nebraska Surface Water Quality Standards




Nebraska Department of Environmental Quality
1200 "N" Street, Suite 400
P.O. Box 98922
Lincoln, Nebraska 68509
(402) 471-2186