Temecula, CA Noise from Specific Sources: Car Alarm Limits (2026)

Chapter 9.20 sets Temecula's general noise rules, including the exterior sound level limits of Section 9.20.040 and the nighttime restrictions on power tools and audio equipment in Section 9.20.060. Section 9.20.030 lists eleven categories of sound that are exempt from "the provisions of this chapter" entirely, and subsection J covers "safety, warning and alarm devices, including, but not limited to, house and car alarms, and other warning devices that are designed to protect the public health, safety, and welfare." Because the exemption applies to "this chapter," a car alarm is not subject to the decibel tables in Section 9.20.040, the sound-level measurement methodology in Section 9.20.050, or the time-of-day restrictions in Section 9.20.060 that apply to audio equipment and power tools.

The exemption sits alongside others for government facilities, capital improvement projects, school activities, property maintenance between 7 a.m. and 8 p.m., and heating and air conditioning equipment. Residents bothered by a persistently triggering car alarm have no noise-ordinance complaint to bring to Temecula code enforcement or police under Chapter 9.20; the exemption is not conditioned on a time limit, a decibel cap, or how long the alarm runs. Any remedy for a malfunctioning or chronically triggered vehicle alarm would have to come from a different legal theory, such as a private nuisance claim, rather than from the city's noise code.