That's a thoughtful question that more people should be asking about public infrastructure! Generally speaking, modern urban trash cans are moving away from materials containing harmful chemicals like BPA. Most cities now prioritize durable, safe plastics for public use, often opting for high-density polyethylene (HDPE) or polypropylene – materials that typically don't require BPA in their manufacturing.
Many municipalities have specific safety standards for public furniture, including waste receptacles. These standards often exclude materials known to leach harmful substances. You'll commonly find stainless steel options in high-traffic areas, which completely avoids plastic chemical concerns. For plastic bins, look for recycling symbols #2 (HDPE) or #5 (PP), as these are generally considered safer alternatives.
The trend is definitely toward more sustainable and health-conscious urban planning. Cities increasingly recognize that every piece of public infrastructure, down to trash cans, contributes to overall community wellbeing. While it's always good to check with your local public works department for specific material information, you can feel reasonably confident that today's urban trash cans are designed with public safety in mind.