TMDL Streams

A Total Maximum Daily Load (TMDL) is the calculation of the maximum amount of a pollutant allowed to enter a waterbody so that the waterbody will meet and continue to meet water quality standards for that particular pollutant. A TMDL determines a pollutant reduction target and allocates load reductions necessary to the source(s) of the pollutant. Description Source: EPA Obtained from PASDA. Credit: PA Department of Environmental Protection (DEP), June 2026总最大日负荷量（Total Maximum Daily Load，TMDL）是指为使水体达到并持续符合针对某一特定污染物的水质标准，所计算得出的允许排入该水体的污染物最大总量。TMDL会确定污染物削减目标，并将所需的负荷削减量分配至各污染物排放源。描述来源：美国环境保护署（Environmental Protection Agency，EPA），数据取自宾夕法尼亚州空间数据档案馆（Pennsylvania Spatial Data Access，PASDA）。致谢：宾夕法尼亚州环境保护部（PA Department of Environmental Protection，DEP），2026年6月。