If you follow the label instructions you will be following the law. Usually the substance must be returned to the manufacturer for treatment and disposal. Many of the containers for these substances include label directions for disposal and are regulated under the Federal Insecticide, Fungicide and Rodenticide Act or other statutes. These label directions carry the force of law.
Improper disposal is a violation.
If you have questions about whether a particular chemical or substance may be considered hazardous, contact your county office of waste management, DEP, or simply dispose of the chemical at the next Amnesty Days event. Amnesty Days is a state program now carried out by some local governments. DEP's Division of Waste Planning manages the Amnesty Days program. Amnesty Days accepts hazardous waste from homeowners, farmers, schools, state agencies, small businesses, and other organizations which have no appropriate, economically feasible way to dispose of this waste. The program will accept up to 100 pounds of hazardous waste from each participant.