Aurora, CO Noise Ordinances: Decibel Limits (2026)

Aurora's Unified Development Ordinance sets maximum sound levels by the zone district a use sits in, measured at the property boundary of the neighboring zone. Table 4.11-1 caps Residential-adjacent noise at 55 dBA daytime (7 a.m.-9 p.m.) and 45 dBA at night; Commercial or Mixed-Use at 60/55 dBA; the I-1 industrial district at 70/65 dBA; and the I-2 heavy industrial district at 80/75 dBA. Where more than one land use adjoins a site, the more restrictive standard controls. Construction work follows the I-2 standard from 7 a.m. to 5 p.m., the I-1 standard from 5 p.m. to 9 p.m., and the applicable adjacent-use standard from 9 p.m. to 7 a.m.; trash compactor trucks are held to the I-2 standard at all times. Heavy industrial uses, auto repair, and similar operations must also run vibration, particulate, and odor impacts to the level they are imperceptible without instruments at the site's boundary line.