Contaminant Level (MCL)
Alachlor (also known by many trade names, notably Lasso® and Bullet®) is an organic chemical used as an herbicide to control grasses and broadleaf weeds in corn and other row crops, including cotton, brassicas (cabbages, broccoli, cauliflower, Brussel sprouts, mustard seed), oilseed rape, peanuts, radishes, soy beans, and sugar-cane. Its use is restricted in the United States, but it was at one time one of the most highly used herbicides in the U.S.
It can arrive in drinking water through agricultural runoff.
Alachlor is a likely carcinogen with a wide range of harmful health effects on the liver, kidneys, spleen, eyes and blood. According to the EPA:
Some people who drink water containing alachlor well in excess of the maximum contaminant level (MCL) for many years could have problems with their eyes, liver, kidneys, or spleen, or experience anemia, and may have increased risk of getting cancer.
The EPA recommends granular activated carbon (GAC) for the treatment of alachlor.
Sources:EPA, WHO, EXTOXNET, Farm Chemicals International, Photo: WikiMedia, author: On Chan
(whole house & well units)