Rancho Cucamonga Municipal Code Chapter 8.17 sets exterior decibel limits by receiving land use. Residential zones are capped around 55 dBA day (7 AM-10 PM) and 45 dBA night (10 PM-7 AM) at the property line.
Chapter 8.17 of the Rancho Cucamonga Municipal Code contains a numeric noise standards table that assigns maximum exterior sound levels to each receiving land use category, measured at the property line of the receiving parcel. Typical values are about 55 dBA daytime and 45 dBA nighttime for residential receivers, about 60 dBA and 50 dBA for mixed-use or commercial, and about 70 to 75 dBA for industrial. Sound levels may not exceed these limits by more than 5 dBA for any 15-minute period, with shorter excursions allowed up to 10 or 15 dBA over the base level for only brief instants. The ordinance also addresses impulsive, tonal, and speech-content sounds with additional penalty adjustments. City Code Enforcement uses calibrated sound-level meters when investigating complex complaints, typically at the shared property line. Ordinary enforcement often proceeds under the general nuisance standard without a formal dBA reading when the violation is obvious.
Contact your local code enforcement office for specific penalty information.
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