Quiet hours in Alameda County, CA — also called the noise ordinance, nighttime noise rules, or residential quiet time — define the hours during which excessive noise is prohibited.
Alameda County noise ordinance (Chapter 6.60) sets detailed dB limits by zone and time. Residential nighttime (10 PM–7 AM): 45 dBA for 30+ min/hr, up to 65 dBA max. Daytime (7 AM–10 PM): 50 dBA for 30+ min/hr, up to 70 dBA max. 5 dB penalty for tonal/speech/music noise.
County Code §6.60.040 establishes noise standards by cumulative duration per hour. Residential/sensitive uses (Table 6.60.040A): daytime 50-70 dBA, nighttime 45-65 dBA. Commercial (Table 6.60.040B): daytime 65-85 dBA, nighttime 60-80 dBA. Simple tone, speech, music, or recurring impulsive noises receive 5 dB penalty. When ambient exceeds standard, ambient becomes the standard. Loading/unloading prohibited 9 PM–6 AM if creating disturbance across residential property line. Vibration above perception threshold at property line also prohibited.
First offense warning or citation. Fines typically $100 to $500. Repeat violations may result in misdemeanor charges.
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See how Alameda County's quiet hours rules stack up against other locations.
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