The waterbody name reported is the name of the area for which a TMDL must be developed. In most cases this name is simply the common name of waterbody (e.g., Sacramento River), but in some instances it may be a combination of waterbodies that are to be included within the same TMDL (e.g., Wrinkleneck Creek-Swan Lake). In other instances a single waterbody may have multiple TMDLs planned and can appear several times in a report (e.g., 37 for the Mississippi River).

The EPA ID is a unique identifier for a waterbody issued by EPA to track the status of TMDL development.

Scorecard reports four waterbody type classifications: Rivers, Streams, and Creeks; Lakes, Reservoirs, and Ponds; and Estuaries, Bays, and Coasts; Fresh Water Wetlands. There are also additional waterbodies listed that did not provide the means to determine their appropriate category. These are listed as Body Type Not Designated.

Size is the estimated area of the waterbody that is to be included in the TMDL.

Designated beneficial uses are the desirable uses that water quality should support. Examples are drinking water supply, primary contact recreation (such as swimming), and aquatic life support. Each designated use has a unique set of water quality requirements or criteria that must be met for the use to be realized. States, Tribes, and other jurisdictions may designate an individual water-body for multiple beneficial uses. A waterbody is considered to be impaired when it does not attain water quality standards due to an individual pollutant, multiple pollutants, pollution, or an unknown cause of impairment that preclude it from supporting its designated uses.

Priority for regulation is the Total Maximum Daily Load (TMDL) development priority. A TMDL is a calculation of the maximum amount of a pollutant that a waterbody can receive and still meet water quality standards. In other words, it is the sum of the allowable loads of a single pollutant from all contributing point and nonpoint sources, and includes a margin of safety and consideration of seasonal variations. In addition, a TMDL contains the reductions needed to meet water quality standards and allocates those reductions among the sources in the watershed. The objective of the TMDL process is to systematically identify impaired or threatened waterbodies and the pollutant(s) causing the impairment and ultimately establish a scientifically-based strategy for correcting the impairment or eliminating the threat and restoring the waterbody. Scorecard reports six categories of priorities; targeted (a TMDL is expected to be developed within two years), high, medium, low, not assessed (the state agency responsible for TMDL development has not determined a waterbody's TMDL development priority), and not reported (no information was submitted to EPA regarding a waterbody's TMDL development priority)