Quiet hours in Los Angeles County, CA — also called the noise ordinance, nighttime noise rules, or residential quiet time — define the hours during which excessive noise is prohibited.
Los Angeles County Code Title 12, Chapter 12.08 establishes exterior noise standards for unincorporated areas. Residential zones are limited to 50 dBA daytime and 45 dBA nighttime. Nighttime quiet hours run from 10 PM to 7 AM.
LA County Code Section 12.08.390 sets exterior noise standards for unincorporated communities by zone. Residential zones (Noise Zone I) allow a maximum of 50 dBA daytime and 45 dBA nighttime. Commercial zones (Noise Zone II) permit 60 dBA daytime and 55 dBA nighttime. Industrial zones (Noise Zone III) allow 70 dBA at all times. Daytime is 7 AM to 10 PM and nighttime is 10 PM to 7 AM. Sound exceeding these levels for more than 30 cumulative minutes per hour violates Standard No. 1. A separate standard limits sound exceeding the base by 5 dB to no more than 15 minutes per hour. The Department of Public Health Environmental Health Division enforces these limits in unincorporated areas like East LA, Altadena, and Hacienda Heights.
Violations are misdemeanors under Section 12.08.590, punishable by fines up to $1,000 and/or six months in county jail. Citations may be issued under Section 12.08.390 for exceeding exterior noise standards.
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See how Los Angeles County's quiet hours rules stack up against other locations.
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