Noise Ordinances in Aurora, CO

If you live in Aurora or are thinking about moving there, noise ordinances are one of those things you probably won't think about until they affect you directly. Aurora has 7 specific rules on the books covering different aspects of noise ordinances, and some of them might surprise you.

Decibel Limits

Aurora caps commercial and industrial sound by zone, from 55 dBA near homes up to 80 dBA in heavy industrial (I-2) districts.

Key details: Residential-adjacent limit: 55 dBA day / 45 dBA night. I-1 industrial limit: 70 dBA day / 65 dBA night. I-2 heavy industrial limit: 80 dBA day / 75 dBA night. Measured at: property boundary of neighboring zone. Governs: UDO, not the general noise chapter.

Enforced under the UDO's zoning enforcement provisions administered by the Planning Director; a sound level meter meeting ANSI S1.4-1974 type I or II specifications is used to measure violations at the property line.

Amplified Music & Outdoor Sound

Aurora caps amplified sound and loudspeakers at 55 dBA (day) / 45 dBA (night) at residential property lines, and bars PA systems near homes from 10 p.m. to 7 a.m.

Key details: Residential daytime cap: 55 dBA, 7am-9pm. Residential nighttime cap: 45 dBA, 9pm-7am. PA/loudspeaker curfew: No use 10pm-7am near homes. Commercial zone cap: 60/55 dBA. Governing instrument: UDO, not City Code Ch. 146.

Enforced by the City; violations of the UDO noise standards are a general municipal-code violation. The UDO also cross-references City Code Ch. 94 (Unnecessary Noise; Disturbing the Peace) as an alternate/complaint-driven enforcement path where a more specific standard applies.

Quiet Hours

Aurora's UDO sets lower nighttime decibel limits citywide and bars loudspeakers and PA systems near homes from 10 p.m. to 7 a.m. without a temporary permit.

Key details: Residential night limit: 45 dBA, 9pm–7am. Residential day limit: 55 dBA, 7am–9pm. Loudspeaker/PA curfew: 10pm–7am, permit required. Governing instrument: UDO, not City Code Ch. 146. General nuisance backstop: City Code § 94-107, 24/7.

Enforceable as a zoning/UDO violation citywide; loudspeaker use after 10 p.m. without a permit or exceeding nighttime dBA limits at a residential line can bring code enforcement action independent of the general noise-nuisance citation under § 94-107.

Vehicle Noise

Aurora, Colorado caps noise-producing devices -- including car stereos -- at the decibel limits in UDO Table 4.11-1, and bars idling any gas or diesel vehicle for more than 15 minutes in any hour, citywide.

Key details: Residential daytime cap: 55 dBA, 7 a.m.-9 p.m.. Residential nighttime cap: 45 dBA, 9 p.m.-7 a.m.. Vehicle idling limit: 15 minutes per hour, citywide. Muffler-noise MTC clause: Expressly NOT adopted by Aurora. General nuisance backstop: City Code Sec. 94-107, police-enforced.

Exceeding the Table 4.11-1 decibel limits, running a sound device that violates them, or idling past 15 minutes per hour is citable; loud vehicle noise elsewhere is enforceable as a public nuisance under Sec. 94-107.

Aircraft Noise

Aurora, Colorado requires new and remodeled residential and commercial buildings inside its designated aircraft noise districts to meet minimum sound-insulation standards. City Code Article XI provides three methods of showing compliance.

Key details: Minimum OITL: 25-30 decibels by district. Building parts covered: Exterior walls, windows, doors and vents. Districts covered: Buckley, DIA, Centennial, Front Range. District names: NID, SNID, CANA, NIBA. Compliance methods: 3 design/testing options.

Building permits for covered projects require compliance with one of the three design methods and, for Method III, verified testing before occupancy; noncompliant construction is subject to the city's standard building-code enforcement and permit denial.

Barking Dogs

Aurora bans keeping a dog whose habitual barking annoys neighbors, but a case only proceeds with two signed complaints from separate households willing to testify.

Key details: Governing section: Aurora City Code § 14-72. Complaint threshold: 2+ households, signed, willing to testify. Reviewed by: Animal protection officer for probable cause. Enforcement: Aurora Municipal Court.

Municipal court citation under § 14-72 once two qualifying signed complaints from separate households support probable cause; penalties follow the general penalty provision in § 1-13.

Construction Hours

Aurora ties construction noise limits to the time of day: the I-2 standard from 7 am to 5 pm, the tighter I-1 standard from 5 pm to 9 pm, and the standard of the adjacent land use between 9 pm and 7 am.

Key details: 7am-5pm limit: 80 dBA (I-2 standard). 5pm-9pm limit: 70 dBA (I-1 standard). 9pm-7am limit: 45 dBA next to residential. Trash compactors: I-2 standard at all times. Measured at: Neighboring property line.

Enforceable as a noise violation under the UDO; a sound-level exceedance measured at the neighboring property line is the trigger, not a fixed clock-out time.

The Bottom Line

Aurora's noise ordinances rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Aurora is broadly strict or permissive.

All of the above reflects Aurora's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.