Ask the retailer if the canister can be returned for recycling or disposal when it’s empty. And please whenever possible, buy refillable, reusable propane tanks. There are a variety of refillable canister sizes on the market.
There are just a few local vendors available to assist with disposal of single-use propane canisters at a cost per cylinder – Please call ahead for details.
AmeriGas (Gurnee) 847-623-1555
Hicks Gas (Lake Villa) 847-356-8225
OR depressurize and dispose of through your regular trash.
You can depressurize by running the tank until it's empty.