Littleton, CO Noise from Specific Sources: Generator Noise (2026)

or similar mechanical device' under City Code Section 7-3-5(G): operating a generator in excess of the maximum permissible sound pressure level set for the zoning district where it sits is unlawful, with the limit varying by district under the table in Section 7-3-6. A generator also counts as a 'stationary internal combustion engine' under Section 7-3-5(B), so its exhaust must discharge through a muffler or other noise-reducing device that is in good order and free of defects; running a generator with a blown or missing muffler is a separate violation even if the decibel limit isn't exceeded.

weekends and holidays, subject to the industrial-district sound limit for as long as the building permit runs. An operator who cannot meet the sound limits may ask the City Manager for hardship relief under Section 7-3-10(B) by showing that added time is needed to bring the generator into compliance, that the noise is temporary, and that no reasonable alternative exists; a denial or unwanted condition can be appealed to the Board of Adjustment. Enforcement runs through personnel trained in noise control and equipped with calibrated sound level meters under Section 7-3-11(A); because a generator is not a self-propelled motor vehicle, the city typically issues a written notice giving the owner up to five days to abate the noise before pursuing a summons and complaint.