Call your town hall. They have programs for dealing with HazMat (hazardess materials). Sorry, do not throw them in the garbage, even after you soak them for a few days. You'd be adding hazardess waste to the ground water. In addition, once they dry, they are again flammable. I don't suggest lighting them in the backyard either. They're designed to light over open water, not fields or lawns. Sparks fly; fires ensue. Dispose properly, please. I keep four expired flares on board in additon to fresh ones. You never know when you'll need some extras. I have to admit, that boxfull would be too much to have on board! I guess we're lucky in that our local fire department takes them for use in training exercises. Hy