Denver noise complaints go through 311

A late-night party next door, a barking dog at 3 a.m., a contractor running equipment before sunrise — Denver handles all of it through one channel rather than a knock on the neighbor’s door. You can file a noise complaint two ways: call 311, the city’s general help line, or use the online complaint process. Either route puts the issue in front of the same people.

Behind that single front door sits the city’s noise program, run under public health. It takes in the complaints and also handles appeals when someone disputes one. Routing the issue here moves it out of the realm of a private quarrel and into the hands of the office whose job is to measure noise against the rules and decide what to do about it.

Emergencies are a separate matter. If a situation feels dangerous or threatening right now, not just loud, call 911 instead of 311. The noise program is built for ongoing nuisance, not for an emergency unfolding in real time.

For the everyday cases, a little record-keeping makes the complaint stronger. Jot down the location, the time, and how often the noise repeats. A pattern (the same source, the same hour, several nights running) gives the city something concrete to evaluate, rather than a single bad evening that is hard to verify after the fact. Once you have that, the noise complaint page walks through the rest of the steps.