Outdoor & Yard / Compounds / Metolachlor (S-metolachlor)

Metolachlor (S-metolachlor) in the yard and garden

Moderate risk for your yard

Metolachlor (S-metolachlor) — herbicide. See EDC classification.

What is metolachlor (s-metolachlor)?

Also known as: metolachlor, Pennant, Codal, Dual.

CAS number
51218-45-2
Molecular formula
C15H22ClNO2
Molecular weight
283.79 g/mol
SMILES
CCC1=CC=CC(=C1N(C(C)COC)C(=O)CCl)C
PubChem CID
4169

Risk for people, pets,

Moderate risk

Metolachlor (S-metolachlor) — herbicide. See EDC classification.

Regulatory consensus

1 regulatory bodyhas classified Metolachlor (S-metolachlor).

AgencyYearClassificationNotes
EDC Assessment—Suspected endocrine disruptor

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where your yard encounter metolachlor (s-metolachlor)

  • Agricultural Products — crop treatment, soil application
  • Food Chain — residue on produce, water contamination

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Metolachlor (S-metolachlor):

  • Integrated Pest Management (IPM); Biopesticides; Biological control
    Trade-offs: Combines biological, cultural, and targeted chemical controls; reduces overall chemical use 30-70%; requires trained practitioners and monitoring infrastructure; higher management complexity; proven effective at scale in many crop systems.
    Relative cost: 1.2-2×

Frequently asked questions

Is metolachlor (s-metolachlor) safe for your yard?

Metolachlor (S-metolachlor) — herbicide. See EDC classification.

What products contain metolachlor (s-metolachlor)?

Metolachlor (S-metolachlor) appears in: crop treatment (Agricultural products); soil application (Agricultural products); residue on produce (Food chain); water contamination (Food chain).

See Metolachlor (S-metolachlor) in the outdoor app

Look up products containing metolachlor (s-metolachlor), compare to alternatives, and explore the full data record.

Open in outdoor View raw API data

Sources (1)
  1. PubChem (2026) — database

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →