Metolachlor
Health Effects
EPA's Integrated Risk Information System classifies Metolachlor as: C; possible human carcinogen. EPA's stated basis: "Classification is based on the appearance of proliferative liver lesions (combined neoplastic nodules and carcinomas) at highest dose tested (3000 ppm) in female rats." EPA has not set a federal drinking-water limit (MCL or MCLG) for Metolachlor; IRIS assesses a chemical's toxicity, not the amount permitted in tap water.
Source: EPA IRIS — Integrated Risk Information System (IRIS) (retrieved 2026-07-28)
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Contaminant Type
Metolachlor is classified as a Herbicides contaminant.
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