California note
Diamond Bar concerns usually start with the exact location
Diamond Bar's Report a Concern page supports maintenance reports and information requests, while Public Works handles streets, sidewalks, signs, storm drains, streetlights, and traffic signals.
Diamond Bar’s Report a Concern page is the place to start for maintenance issues or information requests. For physical city problems, the location matters most.
Public Works covers city streets, public right-of-way, capital projects, utilities, and traffic-related issues. Its maintenance list includes curbs, gutters, landscaping, sewers and storm drains, sidewalks, signs, streetlights, streets, and traffic signals.
Diamond Bar’s hills, winding roads, shopping centers, and freeway edges can make a problem hard to place. A good request should include the nearest address, cross street, side of the street, direction of travel, and a photo if the spot is easy to miss.
Use the concern form for routine city issues. If the problem is a hazard that needs immediate response, use the emergency or direct contact shown for that situation instead of waiting for a normal service review.
Where to see it
Diamond Bar Report a Concern and Public Works pages.
Official sources
Official pages
Reviewed July 4, 2026
Current rules, forms, fees, deadlines, maps, and office instructions.
Rules, forms, fees, deadlines, and office procedures can change. Check the current page before you file, pay, or rely on a date.
Connected places
Open the local directory
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