Corona, CA Noise Ordinances: Decibel Limits (2026)

nighttime period. Single-family, double-family and multi-family residential parcels, along with other sensitive land uses such as churches, hospitals, convalescent homes and school classrooms, are held to 55 dBA exterior by day, 50 dBA exterior at night, 45 dBA interior by day and 35 dBA interior at night. Commercial uses may run to 65 dBA daytime and 60 dBA nighttime exterior with no interior standard; industrial, manufacturing or agricultural uses may run to 75 dBA daytime and 70 dBA nighttime exterior. 040(C)(2)(a) trims every one of those limits by 5 dBA for impulsive or simple-tone noise, unless the ambient level already exceeds the reduced figure, in which case the ambient becomes the standard.

Subsection (d) layers in a graduated cumulative-time test for exterior violations measured on a neighboring property: the base standard applies for any cumulative period over 30 minutes an hour, the standard plus 5 dB for over 15 minutes, plus 10 dB for over five minutes, plus 15 dB for over one minute, and plus 20 dB for any period at all. Interior violations use a tighter five-minute, one-minute and instantaneous scale under subsection (e). If a measurement point sits on the boundary between two noise zones, the lower of the two standards governs.

A property owner whose equipment cannot immediately comply may apply to the Community Development Department for a variance, which the Board of Zoning Adjustment decides after weighing nuisance magnitude, surrounding land uses and the cost and timeline of remedial work.