The specific laws and regulations governing use, storage, disposal, and transportation of pesticides differ slightly in each northwestern state. Before you use pesticides, obtain a copy of the detailed pesticide use laws and rules for the state(s) in which you are operating. The state-specific pesticide laws and rules can be found at each state department of agriculture website.
For regulations on hazardous waste:
Department of Environmental Quality
1410 North Hilton
Boise, ID 83706-1255