Methoxone (MCPA)

Spraying on turf, fields, and roadsides; it can run off into streams or seep into shallow wells after use [1][2].

Skin contact or breathing spray during application; touching treated grass before it’s dry; drift from nearby spraying; drinking contaminated private well water. Food residues are regulated and typically low [1][2].

Short-term exposure can cause irritation, nausea, vomiting, headache, or dizziness; severe poisoning is uncommon but more serious effects can occur at high doses [2]. IARC found evidence inadequate to classify MCPA’s carcinogenicity; EPA assessments indicate typical community exposures are below levels of concern when used as directed [1][3].

Applicators and farmworkers; people living near frequent spraying; children and pets on recently treated lawns; households with shallow/private wells near treated fields [1][2].

Follow label directions; avoid treated areas until dry or the reentry interval ends; use protective gear when applying; close windows during nearby spraying; wash hands and produce; test private well water if you live near heavy use [1][2].