That's an excellent and very specific question! Living or managing public spaces near the coast brings a unique set of challenges, and choosing the right trash can is more about durability than aesthetics. The "best" option isn't a single product, but a set of material and design specifications you should look for.
The undisputed champion for coastal areas is Marine-Grade 316 Stainless Steel. While 304 stainless is common inland, the added molybdenum in 316 provides far superior resistance to pitting and corrosion from salt spray. You'll want a brushed or satin finish, as it shows scratches and salt residue less than a mirror polish.
If metal isn't feasible, focus on high-quality, UV-stabilized polymer bins with a powder-coated steel frame. The powder coating must be thick and applied to a properly sandblasted surface. Avoid cheap paint, which will blister and rust quickly. For any moving parts (lids, pedals), ensure they are made of non-corrosive materials like stainless steel or marine-grade aluminum.
Design is crucial. Look for sealed seams, hidden fasteners, and sloped tops. This prevents salt-laden moisture from pooling and collecting in crevices where corrosion begins. Adequate drainage holes are a must to let rainwater flush out debris and salt.
Smart features like solar-powered compaction can be beneficial, but ensure the electronic components are housed in a fully sealed, waterproof compartment. In very high-traffic or vulnerable locations, consider anchored or concreted-in designs to prevent theft or storm damage.
Ultimately, the best coastal trash can is an investment. It prioritizes robust, corrosion-resistant materials and smart engineering over low initial cost, ensuring it withstands the harsh, salty environment for years to come.