Moreno Valley Noise Ordinances: Decibel Limits Rules (2026)

Moreno Valley applies a tiered decibel structure under Title 11 of the Municipal Code, consistent with most Southern California suburban noise ordinances. In residential zones the typical exterior cap is 55 dBA between 7 AM and 10 PM and 50 dBA between 10 PM and 7 AM, measured at the receiving property line. Commercial zones run about 65 dBA day and 60 dBA night, and industrial zones allow 70 dBA or higher. The ordinance also uses a L-statistical methodology for longer monitoring: a noise source cannot exceed the standard for more than a cumulative percentage of any hour (for example, no more than 30 minutes above the standard, no more than 15 minutes at +5 dB, no more than 5 minutes at +10 dB, and never more than +20 dB). Impulse or pure-tone sources (hammering, backup beepers, whistles) get a penalty of 5 dB in some interpretations. Measurements are taken on an ANSI Type 2 or better sound level meter, A-weighted, slow response, at least 4 feet above the ground and 4 feet from any reflective surface. Building interior noise standards (around 45 dBA) apply inside a dwelling from any single outside source. Code Compliance officers can run measurements, but most disputes resolve through warning letters rather than contested meter readings.