Metribuzin
Health Effects
EPA's Integrated Risk Information System classifies Metribuzin as: D; not classifiable as to human carcinogenicity. EPA's stated basis: "No human data and inadequate evidence from animal bioassays. Metribuzin did not increase the incidence of tumors in a lifetime dietary study using CD-1 mice when compared with both concurrent and historic controls. In a 2-year feeding study in Wistar rats, no significant differences in neoplastic findings between the test and control groups were found. Short-term studies in bacteria and mammalian systems suggest that metribuzin is not mutagenic." EPA has not set a federal drinking-water limit (MCL or MCLG) for Metribuzin; 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
Metribuzin is classified as a Herbicides contaminant.
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