Take unused road flares to the Kitsap County Household Hazardous Waste facility for free disposal. 

Treat discharged road flares like fireworks: soak them in a bucket of water for at least 15 minutes, wrap them in plastic, then put them in your garbage. Dump leftover water on gravel or grass – not down a sink or storm drain where it could pollute groundwater, streams, or Puget Sound.

Marine flares are more dangerous and are considered explosive, so please follow these explosives disposal instructions