Sunnyvale, CA Noise Ordinances: Amplified Music & Outdoor Sound (2026)

Section 9.48.010 of the Sunnyvale Municipal Code prohibits any person from operating a loudspeaker, sound amplifier or similar instrument so that sound projects outside a building or out-of-doors anywhere in the city between ten p.m. and ten a.m. The only exception is for 'public events and affairs of interest to the general public,' and even then the operator must first obtain a permit from the chief of the department of public safety. The ordinance gives the chief broad discretion: a permit is granted on application, but it is revocable whenever the loudspeaker or amplifier 'is objectionable to, or disturbs the public peace.' Once revoked, the chapter bars renewal unless the applicant offers satisfactory proof the disturbance will not recur.

The chapter traces to the city's prior code (Section 4-9.03) and remains the operative nighttime restriction on amplified sound, distinct from the citywide decibel standards found in Section 19.42.030. Because Chapter 9.48 is not among the chapters Section 1.04.010(b) designates as infraction-only, a violation defaults to the code's general penalty: a misdemeanor punishable under Section 1.04.020 by a fine of up to $1,000, up to six months in county jail, or both, with each day of continued violation charged as a separate offense. Daytime operation, between ten a.m. and ten p.m., is not restricted by this section and needs no permit under Chapter 9.48, though other permits, such as a special event permit under Chapter 9.45, may still apply if the amplified sound accompanies a larger gathering.