Restricted-use Herbicides in Idaho, Oregon, and Washington

Ed Peachey
March 2022

Federally Restricted-Use Herbicides


The active ingredients listed below are designated as restricted-use by the U.S. Environmental Protection Agency (EPA); buying them requires a certified pesticide applicator’s license.

Herbicides are listed by the active ingredient. Some or all uses of these active ingredients are considered restricted-use. Before purchasing any pesticide, consult the label for usage category.

  • Acrolein (high acute toxicity)
  • Atrazine (ground and surface water contamination)
  • Dazomet (acute inhalation toxicity to humans)
  • Dichloropropene (due to high acute inhalation toxicity and carcinogenicity)
  • Metam-sodium (acute inhalation toxicity to humans)
  • Methyl bromide (acute toxicity, hazards to humans and domestic animals)
  • Paraquat (acute toxicity)
  • Phenmedipham (dermal irritation)
  • Picloram (may injure susceptible, non-target plants)
  • Pronamide (some formulations; tumors in laboratory animals)

Additional Restricted-Use Herbicides in WA


Some or all uses of the following herbicide active ingredients are classified as restricted-use in addition to the federal restricted-use pesticides listed above. Before purchasing any pesticide, consult the label for usage category and site.

  • All aquatic uses of herbicides
  • All formulations of phenoxy hormone-type herbicides (e.g., 2,4-D, 2,4-DB, 2,4-DP (dichlorprop), MCPA, MCPB, MCPP (mecoprop) and dicamba when distributed in counties located east of the crest of the Cascade Mountains
  • Bromacil (ground water)
  • Clopyralid (disposal of grass clippings)
  • DCPA (ground water)
  • Diuron (ground water)
  • Hexazinone (ground water)
  • Metribuzin; (ground water)
  • Metolachlor (ground water)
  • Picloram (ground water)
  • Prometon (ground water)
  • Simazine (ground water)
  • Tebuthiuron (ground water)