EPA Designation Regulated
EPA Classification Organic Chemicals
EPA Levels 1,2 0.1 MCLG (mg/L)
0.1 MCLG (mg/L)
Alternative Names none
Sources Runoff from herbicide use
Endothall is an herbicide and defoliant used on a broad range of crops and aquatic plants.


Endothall is an organic solid of white odorless crystals.


Endothall is used as a defoliant for a wide range of crops and as a herbicide for both terrestrial anad aquatic weeds. It is used as a desiccant on lucerne and on potato, for the defoliation of cotton, to control aquatic weeds and as an aquatic algicide growth regulator. It has been used for sugar beets, turf, hops sucker suppression; alfalfa, clover desiccants; potato vine killers.

Health Effects

Some people who drink water containing endothall well in excess of the maximum contaminant level (MCL) for many years could experience problems with the stomach or intestines.

EPA Data Source: Endothall

EPA Definitions:

1Maximum Contaminant Level Goal (MCLG) - The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety and are non-enforceable public health goals.

Maximum Contaminant Level (MCL) - The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to MCLGs as feasible using the best available treatment technology and taking cost into consideration. MCLs are enforceable standards.

Maximum Residual Disinfectant Level Goal (MRDLG) - The level of a drinking water disinfectant below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants.

(TT) Treatment Technique - A required process intended to reduce the level of a contaminant in drinking water.

Maximum Residual Disinfectant Level (MRDL) - The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.

2 Units are in milligrams per liter (mg/L) unless otherwise noted. Milligrams per liter are equivalent to parts per million.