Mandatory no-spray buffers along designated salmon-supporting waters are currently required for nine pesticides in Oregon, Washington, and California. Buffers are required specifically for protection of salmon and steelhead listed as threatened or endangered. The buffers are currently required for pesticides containing any of the following active ingredients:
bromoxynil, carbaryl, chlorpyrifos, diazinon, malathion, methomyl, metolachlor, prometryn, and 1,3-dichloropropene
The EPA maintains a site called Salmon Mapper, which is a great reference for figuring out exactly where the buffers apply.
These buffer zones will remain in place for carbaryl, chlorpyrifos, diazinon, malathion, and methomyl until EPA implements any necessary protections for Pacific salmon and steelhead based on reinitiated consultations with the National Marine Fisheries Services. Buffer zones for the remaining four chemicals will remain in place until final Biological Opinions are completed.