Heptachlor epoxide is formed when heptachlor breaks down in the environment. Most uses of heptachlor to kill termites in homes and insects on far crops was canceled in 1978. The only permitted use of heptachlor products is for fire ant control in buried pad-mounted electric power transformers, and in underground cable television and telephone cable boxes. Heptachlor epoxide adsorbs strongly to soil, but is extremely resistant to biodegration, persisting for many years in the upper soil layers. Similarly in water, heptachlor epoxide will persist, usually in sediments. It is concentrated extensively in aquatic life. It is taken up into the food chain into animals and milk.
Some people who drink water containing heptachlor epoxide well in excess of the maximum contaminant level (MCL) for many years could experience liver damage and may have an increased risk of getting cancer.
MCL ADVISORY - ACTION IS HIGHLY RECOMMENDED
Heptachlor epoxide levels were detected in your water sample to exceed the maximum contaminant level (MCL).
ACTION IS OPTIONAL
Heptachlor epoxide levels were detected in your water sample but do not exceed the maximum contaminant level.
- USEPA - Water: Basic Information about Regulated Drinking Water Contaminants - Basic Information about Heptachlor Epoxide in Drinking Water
- ATSDR - Toxic Substances Portal - Heptachlor and Heptachlor Epoxide
- Ohio Department of Health - Private Water Systems Program - Water Quality - Organic Contaminants
- ATSDR ToxFAQs Fact Sheet - Heptachlor and Heptachlor Epoxide