If I were choosing bins for a city that gets rain, sun, salt, frost, and maybe a bit of vandalism, I’d start with 316 stainless steel if the budget allows. It’s the closest thing to a “set it and forget it” material for harsh weather: it resists rust, handles coastal salt air well, and keeps its strength and appearance for a very long time. The catch is cost, and it can still scratch or be targeted by thieves, so sturdy fixings and a sensible design matter.
For most municipal budgets, though, hot-dip galvanized steel with a good powder coating is the smarter balance. The zinc layer protects the steel even when the coating is scratched, and the powder coat adds UV and weather protection plus a cleaner look. I’d specify hot-dip galvanizing rather than a thin electroplated finish, and I’d make sure scratches get touched up. It’s tough, repairable, and much more affordable than marine-grade stainless.
UV-stabilized HDPE is another strong option, especially in wet or cold climates where rust is the main worry. It won’t corrode, it’s easy to clean, and it copes well with freezing conditions. But cheap or poorly stabilized plastic can chalk, fade, and become brittle under strong sun, and it’s not as rigid as steel. For coastal salt exposure, HDPE has real advantages, but I’d insist on a proven UV package and a thick, well-braced body.
Concrete is extremely durable and heavy, so it’s good for fixed locations where theft and movement are concerns, but it’s less pleasant for frequent emptying and can stain. Aluminum is corrosion-resistant and light, but it dents and is often stolen.
My practical answer: specify 316 stainless steel for maximum lifespan and coastal or salt-heavy sites; choose hot-dip galvanized steel with powder coating for the best everyday municipal value; and use UV-stabilized HDPE where rust resistance and lower weight matter most. Also pay attention to hinges, fasteners, drainage, and water-trapping details—those often decide whether a good material actually survives harsh weather.