That's the thing that's given me pause all this time.
Might be a good idea to call your local fire department. Just tell them what you have and see what they advise you to do. I had a whole bunch of very old marine flares I inherited, and wanted to get them off the property. I called around to hazardous waste, and even to Sacramento, and got no good answers. I finally called the Harbor Patrol in the city next door, and they said to bring them by and they'll use them for training, or otherwise dispose of them. I did that, and they actually thanked me for bringing them in. I imagine your local fire department might even come out and pick it up, but don't quote me on that.