Castro Valley, CA Noise Ordinances: Quiet Hours (2026)
Quiet hours in Castro Valley, CA, also called the noise ordinance, nighttime noise rules, or residential quiet time, define the hours during which excessive noise is prohibited.
Key Facts
- Code Chapter
- Alameda County Code Ch. 6.60
- Standard
- Plainly audible at 50 feet (no dB reading required)
- Daytime
- 7 a.m.-10 p.m.
- Nighttime
- 10 p.m.-7 a.m.
- Loading/Trash Quiet Hours
- 9 p.m.-6 a.m. across a residential line
- Enforcing Agency
- Alameda County Sheriff (non-emergency 510-667-7721)
Summary
Castro Valley is unincorporated and operates under Alameda County Code Chapter 6.60 (Noise). §6.60.050 makes it a violation to operate any sound-producing device at any hour if the sound is 'plainly audible at a distance of 50 feet,' with stricter weekday/weekend hour windows for tools and vehicle work.
Operating, playing or permitting the operation or playing of any radio, stereo, television set, audio equipment, electronic equipment, drum, musical instrument or device which produces or reproduces sound at any time of day, in such a manner that the sound is plainly audible at a distance of fifty (50) feet from such device. 'Plainly audible' is defined as any sound that can be detected by a person using his or her unaided hearing faculties.
Full Breakdown
Alameda County §6.60.050 prohibits operating or playing any radio, stereo, television, audio equipment, drum, musical instrument or device that produces or reproduces sound at any time of day if 'plainly audible at a distance of fifty (50) feet from such device.' The same section also prohibits loading/unloading boxes, containers, building materials, garbage cans or similar objects between 9 p.m. and 6 a.m. if it causes a noise disturbance across a residential property line. 'Plainly audible' is defined as sound detectable by a person using unaided hearing. Castro Valley uses the same daytime/nighttime split as the county: 7 a.m.-10 p.m. day, 10 p.m.-7 a.m. night.
Violations & Fines
Violation of Chapter 6.60 is a misdemeanor under §6.60.090 punishable by up to $1,000 fine and/or six months in jail per Cal. Govt. Code §25132. Alameda County Code Enforcement may issue administrative citations escalating from $100 (first), $200 (second within 12 months) to $500 (third) under Chapter 1.08. Sheriff's Office responds to active disturbances; Code Enforcement handles patterns.
Frequently Asked Questions
What are quiet hours in Castro Valley?
Sources & Official References
Other rules in Castro Valley
How Castro Valley compares: Cities with the Strictest Noise Ordinances·California rules heatmap·Compare Castro Valley to another location·View the California noise ordinances overview
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Quiet Hours in Nearby Cities
How other cities in Alameda County handle quiet hours.