Question 1

What is the EPA limit for heptachlor in drinking water?

Accepted Answer

The EPA Maximum Contaminant Level (MCL) for heptachlor is 0.0004 ppm. Public water systems must keep heptachlor below this level.

Question 2

What are the health effects of heptachlor in drinking water?

Accepted Answer

Heptachlor and its breakdown product heptachlor epoxide are classified as probable human carcinogens (EPA Group B2) based on liver tumors in mice. The EPA MCL of 0.4 ppb is the fourth-lowest among regulated pesticides. Chronic exposure caus

Question 3

Where does heptachlor in drinking water come from?

Accepted Answer

Heptachlor was used extensively from the 1950s through the 1980s as a soil insecticide for termite control, seed treatment, and household pest control. The EPA cancelled most uses in 1988, but allowed continued use for fire ant control in u

Question 4

How do I remove heptachlor from my drinking water?

Accepted Answer

Heptachlor is effectively removed by: Activated Carbon, Reverse Osmosis. Look for NSF-certified filters that explicitly list heptachlor reduction.

Heptachlor in Drinking Water - EPA MCL, Health Effects & Removal