Pasadena Decibel Limits Rules (2026): What You Need to Know

Pasadena Municipal Code Chapter 9.36 establishes a comprehensive decibel-based noise control framework that applies citywide. The exterior noise limits are keyed to zoning district: single-family and multi-family residential zones carry a 55 dBA exterior limit from 7 AM to 9 PM on weekdays (8 AM to 9 PM on weekends and holidays), dropping to 45 dBA during nighttime quiet hours. Commercial and mixed-use zones permit 65 dBA during the day and 55 dBA at night. When a noise source is in a louder zone but the receiving property is in a quieter zone, the limits of the quieter zone govern. All measurements are conducted using the A-weighting network and slow meter response at the property line of the affected parcel, following the methodology in Section 9.36.030.

A particularly impactful provision applies a 5 dB correction when sound has a discernible tonal quality (such as a pure tone or narrow band of frequencies), exhibits repetitive impulsive character (hammering, gunfire-like sounds), or is clearly distinguishable above background noise. This correction effectively reduces the threshold at which a sound source is found to be in violation. For example, an HVAC unit with an audible tonal hum in a residential zone must remain below approximately 40 dBA at night rather than the standard 45 dBA. Fixed mechanical equipment, including air conditioning systems, pool pumps, generators, and commercial kitchen ventilation fans, are the most common subjects of decibel-limit complaints. Pasadena Code Compliance (626-744-4633) and the Police Department non-emergency line (626-744-4241) both accept noise measurement requests.