Metolachlor (also known by its common enantiomer name S-Metolachlor) is an herbicide used to control grassy and broad-leaf weeds around a wide range of crops including corn, soy, legumes, peas, potatoes, fruits, cabbages, peppers, cotton, sorghum and safflower. It's also used in non-crop areas, including residentially, on turf, ornamentals, forestry, roadsides and other rights-of-way.
Metolachlor can arrive in drinking-water from run-off from its agricultural use, although the World Health Organization reports that it is more likely to be found in surface water than ground water.
Metolachlor has a low toxicity with acute exposure. Long-term exposure to large amounts has been shown to cause changes in kidney weight. It is classified by the EPA as a possible human carcinogen, having caused tumors in rats but not in mice.
According the the WHO, metolachlor may be treated with granular activated carbon (GAC).
(whole house & well units)