Total Maximum Daily Load (TMDL) Clause Samples

The Total Maximum Daily Load (TMDL) clause establishes the maximum amount of a specific pollutant that a waterbody can receive while still meeting water quality standards. In practice, this clause sets quantitative limits on pollutant discharges from point and nonpoint sources, often requiring monitoring, reporting, and implementation of best management practices to ensure compliance. Its core function is to protect water quality by preventing excessive pollution, thereby ensuring regulatory compliance and safeguarding environmental and public health.
Total Maximum Daily Load (TMDL). A calculation of the maximum amount of a pollutant that a waterbody can receive and still meet water quality standards, and an allocation of that amount to the pollutant's sources. Water quality standards are set by States, Territories, and Tribes. They identify the uses for each waterbody, for example, drinking water supply, contact recreation (swimming), and aquatic life support (fishing), and the scientific criteria to support that use. A TMDL is the sum of the allowable loads of a single pollutant from all contributing point and non-point sources. The calculation must include a margin of safety to ensure that the waterbody can be used for the purposes the State has designated. The calculation must also account for seasonal variation in water quality. The Clean Water Act, Section 303, establishes the water quality standards and TMDL programs, and for Nebraska such standards and programs are administered by the Nebraska Department of Environmental Quality. [Source: EPA and Nebraska Surface Water Quality Standards, Title 117]. Urbanization within the Papillion Creek Watershed has and will continue to increase runoff leading to more flooding problems and diminished water quality. Maintain or reduce stormwater peak discharge during development and after full build-out land use conditions from that which existed under baseline land use conditions.
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Total Maximum Daily Load (TMDL). A calculation of the maximum amount of a pollutant that a waterbody can receive and still meet water quality standards, and an allocation of that amount to the pollutant's sources. TMDLs have been approved by EPA for Zorinsky Lake and Papillion Creek Watershed. A September 2002 TMDL addresses Zorinsky Lake for parameters of concern: siltation, nutrients and organic enrichment/low dissolved oxygen. TMDL for Papillion Creek Watershed was approved in October 2009 for E. coil bacteria for the segments identified in Table 1. Table 1. Papillion Creek Watershed Segments of Impaired Waterbodies. Segment Stream Segment Location MT1-10100 Papillion Creek – Big Papillion Creek confluence with West Papillion Creek to Missouri River MT1-10110 Big Papillion Creek - Little Papillion Creek to confluence with West Papillion Creek MT1-10111 Little Papillion Creek - ▇▇▇▇▇▇ Creek to confluence with Big Papillion Creek MT1-10111.1 ▇▇▇▇ Creek MT1-10120 Big Papillion Creek - Butter Flat Creek to confluence with Little Papillion Creek MT1-10200 West Papillion Creek - South Papillion Creek to Confluence with Big Papillion Creek Water quality standards are set by States, Territories, and Tribes. They identify the uses for each waterbody, for example, drinking water supply, contact recreation (swimming), and aquatic life support (fishing), and the scientific criteria to support that use. A TMDL is the sum of the allowable loads of a single pollutant from all contributing point and non-point sources. The calculation must include a margin of safety to ensure that the waterbody can be used for the purposes the State has designated. The calculation must also account for seasonal variation in water quality. The Clean Water Act, Section 303, establishes the water quality standards and TMDL programs, and for Nebraska such standards and programs are administered by the Nebraska Department of Environmental Quality. [Source: EPA and Nebraska Surface Water Quality Standards, Title 117].
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Total Maximum Daily Load (TMDL). When pollutants adversely affect the use of a waterbody even after implementation of effluent limits for point source dischargers under the NPDES Program, the CWA requires a study to be conducted and a plan developed whereby the impaired segment of that waterbody will be restored. Both this study and the actual numeric load that the stream can bear and still meet WQS are commonly called the TMDL. The TMDL establishes the amount of a pollutant allowed in the relevant waterbody. Section 303(d) requires that states develop a list of waterbodies that need additional work beyond existing controls to achieve or maintain WQS. The additional work necess- ary includes the establishment of TMDLs to determine the reductions in load needed to meet WQS. The TMDL should do the following: » Identify the sources and causes of the pollutant responsible for impairment. » Identify the water quality goal. How much does the pollutant need to be reduced to meet water quality objectives? Regulatory Authorities and Stakeholders » Quantify the total amount of pollutant that can be allowed into the water and what reduc- tions are needed to achieve that amount. Surrogate endpoints may be established that are directly linked to the impairment to ensure the achievement of the water quality goals. The following two elements are not required but may be included with a TMDL submission. » Identify and implement the practices needed to reduce excess pollutants. » Monitor the waterbodies to ensure the goals are being met, and modify the plan if needed. TMDL documents are measured against the following review criteria:
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