Great question. The depth of the base for an urban trash can really depends on a few things—the size and weight of the can, the local climate, and the type of soil you’re dealing with. Generally speaking, for a typical public trash can that’s around 30 to 50 gallons, you’re looking at a concrete base that’s at least 12 to 18 inches deep.
If you’re in an area with freezing winters, you’ll want to go deeper—usually below the frost line. That’s often around 24 to 36 inches deep, depending on your region. Frost heave can push shallow footings up, making the can unstable or topple over. For lighter urban bins with a small footprint, a 12-inch deep concrete pad might be sufficient, but I’d always recommend erring on the deeper side for long-term stability.
In practice, many municipalities pour a cylindrical concrete footing about 18 to 24 inches deep and 12 to 16 inches wide, then embed anchor bolts or a mounting plate. The trash can then bolts into that base. For heavy-duty, high-traffic areas, some even go 30 inches deep with reinforced rebar.
Also, don’t forget to account for drainage—the base should be slightly sloped or include weep holes to prevent water from pooling around the can. And always check local building codes; some cities have specific requirements for public receptacle installations.
In short: 12–18 inches for mild climates, 24–36 inches for frost-prone areas, and always use concrete with reinforcement if the bin is heavy or frequently emptied. Hope that helps!