Endocrine Disrupting Compounds are an emerging concern when it comes to water quality. These contaminants can act as hormones or interfere with hormones in the body, and have been observed to cause reduced fertility, obesity, diabetes, and cancer. Several contaminants including dioxin, BPA, DDT, and more are considered EDCs.

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.

Ethylbenzene is a pollutant from petroleum refineries and industrial chemical factories; it is also used to make plastics, and may be present as an impurity in some insecticides.