EPA Designation Regulated
EPA Classification Organic Chemicals
EPA Levels 1,2 0.002 MCLG (mg/L)
0.002 MCLG (mg/L)
Alternative Names none
Sources Residue of banned insecticide
Endrin is a banned organochlorine insecticide that is persistent, bioaccumulative, acutely toxic to vertebrates and associated with massive deaths of fish, birds and other wildlife.


Endrin is an organic solid of odorless white crystals.


Endrin is an insecticide which has been used mainly on field crops such as cotton, maize, sugarcane, rice, cereals, ornamentals, and other crops. It has also been used for grasshoppers in non-cropland and to control voles and mice in orchards. Once widely used in the United States, most uses were cancelled in 1980.

Health Effects

Some people who drink water containing endrin well in excess of the maximum contaminant level (MCL) for many years could experience liver problems.

EPA Data Source: Endrin

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.