Firework Tips Straight from the Washington State Fire Marshal
Although some towns in our area don't allow the lighting of fireworks, there are some that still do. It's always a hazard to deal with anything as unpredictable once it's lit but there are a few things you should know before doing so.
Only buy fireworks from licensed vendors.
Use outdoors and way from buildings on flat surfaces only.
Have a bucket of water nearby to toss used fireworks in afterwards.
Light one at a time.
Never throw, pick up or carry in your pocket.
Never fire from a container (like a glass jar).
Adults only, don't let kids light them.
Keep pets indoors.
Clean up all debris when finished.
For more you can get all the resources you need straight from the WSP website.