Residential Pesticide Lawn Treatment — 2,4-D and Glyphosate Herbicide Exposure in Home Landscapes — outdoor safety profile
Moderate riskResidential lawn herbicide treatments — primarily 2,4-D (the most widely used herbicide in North America, found in Weed B Gon, Trimec, and most 'weed and feed' products) and glyphosate (Roundup, the world's highest-volume herbicide) — expose household members and pets through post-application contact with treated grass, spray drift, tracked-in residues, and contaminated runoff into waterways.
What is this product?
Residential lawn herbicide treatments — primarily 2,4-D (the most widely used herbicide in North America, found in Weed B Gon, Trimec, and most 'weed and feed' products) and glyphosate (Roundup, the world's highest-volume herbicide) — expose household members and pets through post-application contact with treated grass, spray drift, tracked-in residues, and contaminated runoff into waterways. 2,4-D is a chlorophenoxy auxin-mimic herbicide classified by IARC as Group 2B (possibly carcinogenic); it is detected on treated lawns for 1-3 days after application and transfers to children playing on grass, with studies showing 2,4-D residues on children's hands and in household dust after lawn treatment. Glyphosate, classified by IARC as Group 2A (probably carcinogenic) based on sufficient evidence of genotoxicity and limited evidence of non-Hodgkin lymphoma in epidemiological studies, is detectable in urine of 80% of Americans (CDC NHANES data), with lawn and garden use as a significant contributor to non-occupational exposure. Pets — particularly dogs — are at elevated risk: epidemiological studies show a 2-fold increase in canine malignant lymphoma in households using 2,4-D lawn products (Hayes et al., 1991). Re-entry intervals recommended on product labels (24-48 hours) are frequently ignored by homeowners.
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