Originally Posted By: bunnspecial
With that said, I imagine any store is going to frown on 30 gallons at once.
Most are probably limited to how much they can accept from one person by state law. In California the maximum is 5 gallons per day, although it's possible to do stuff like go to different places or come back the same day and hope that it's a different employee. I've seen some dump maybe 20 gallons during a hazardous waste drop off event.
California has a rule that growers/ranchers are allowed to drop off up to 55 gallons (i.e. the size of a barrel) at specified collection facilities. Some are landfills, recycling centers, oil distributors, auto repair, gas stations, hazardous waste collection, etc.
The local self-service recycling centers may not necessarily monitor how much oil one person is disposing.