A TMDL specifies the maximum amount of a pollutant that a waterbody can receive and still meet water quality standards, and allocates pollutant loadings among point and nonpoint pollutant sources. By law, EPA must approve or disapprove lists and TMDLs established by states, territories, and authorized tribes.
the sum of (1) a waste load allocation (WLA), or that portion of a surface water's loading capacity that is allocated to an existing or future point source discharge; (2) a load allocation (LA), or that portion of the surface water's loading capacity that is due to either existing or future nonpoint source pollution or to natural background sources; and (3) a margin of safety (MS), or that portion of a surface water's loading capacity that is allocated to uncertainty. See Clean Water Act.
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.
a determination of the amount of pollution a waterbody can receive and still maintain water quality standards
The amount of pollutant, or property of a pollutant, from point, nonpoint, and natural sources, that may be discharged to a water quality-limited receiving water.
An estimate of the total quantity of pollutants (from all sources - point, nonpoint, and natural) that may be allowed into waters without exceeding applicable water quality standards.
(TMDL): maximum daily amounts allowed in a body of water.
A sum of the maximum amount of a pollutant that a water body can receive from all contributing point and nonpoint sources and still meet water quality standards.
TMDL TMDLs are set by regulators to allocate the maximum amount of a pollutant that may be introduced into a water body and still assure attainment and maintenance of water quality standards. Related Program - Water Related CFRs and Rules, Federal and State Statutes
(TMDL) a numerical quantification of the pollutant loading that can be received by a waterbody. The TMDL consists of wasteload allocations for point sources (e.g., industrial and municipal discharges), load allocations for non point sources (e.g., agriculture, construction, siviculture), and a margin of safety so that any additional loading, regardless of source, would not produce a violation of water quality standards.
A calculation of the maximum amount of a pollutant that a water body can receive and still meet water quality standards. It is the sum of the allowable loads of a single pollutant from all contributing point and non-point sources.
The sum of the individual wasteload allocations (WLAs) for point sources, load allocations (LAs) for nonpoint sources and natural background, plus a margin of safety (MOS). TMDLs can be expressed in terms of mass per time, toxicity, or other appropriate measures that relate to a state's water quality standard.
(TMDL): A determination of the amount of a pollutant, or property of a pollutant, from point, nonpoint, and natural background sources, including a margin of safety, that may be discharged into a water-quality limited waterbody (EPA, 2000).
A U.S. Environmental Protection Agency determined level of pollution that can be permitted to enter a body of water if water quality is to be maintained.
The maximum allowable loading of a pollutant that a designated water body can assimilate and still meet numeric and narrative water quality standards. TMDLs were established by the 1972 Clean Water Act. Section 303(d) of the US Water Quality Act requires states to identify water bodies that do not meet federal water quality standards. In 1996 the states developed (with EPA approval) a list of water bodies that failed to meet section 303(d) standards. These are the focus of TMDLs. Allocation of named pollutants is on percentage basis.
The total allowable pollutant load to a receiving water such that any additional loading will produce a violation of water-quality standards (USEPA Region 5).
The TMDL process provides a flexible assessment and planning framework for identifying load reductions or other actions needed to attain water quality standards (i.e., water quality goals to protect aquatic life, drinking water, and other water uses). The Clean Water Act §303(d) established the TMDL process to guide application of state standards to individual water bodies and watersheds.
As defined by the EPA, a TMDL "is the sum of the allowable loads of a single pollutant from all contributing point and nonpoint sources. [Its] calculation must include a margin of safety to ensure that the water body can be used for the purposes the State has designated. The calculation must also account for seasonal variation in water quality." The TMDL must also provide some "reasonable assurance" that the water quality problem will be resolved. The states are responsible to implement TMDLs on impaired water bodies. Failure to do so will require the EPA to intervene.
The total amount of a pollutant a water body can accumulate and still meet state water quality standards.
the maximum amount of a given pollutant that a water body can absorb and still maintain its designated uses (e.g., drinking, fishing, shellfish harvesting).
The sum of the individual waste load allocations for point sources, load allocations for non-point sources and natural background, plus a margin of safety. TMDL's can be expressed in terms of mass per time, toxicity, or other appropriate measures that relate to a state's water quality standard.
A Total Maximum Daily Load (TMDL) is a value of the maximum amount of a pollutant that a body of water can receive while still meeting water quality standards; alternatively TMDL is an allocation of that pollutant deemed acceptable to the subject receiving waters.