Quiet Hours: Castro Valley vs Sunol
How do quiet hours rules compare between Castro Valley, CA and Sunol, CA?
Castro Valley and Sunol have similar restriction levels.
Castro Valley, CA
Alameda County
Castro Valley is unincorporated Alameda County, so noise is governed by Alameda County Code Chapter 6.60. Section 6.60.050 prohibits any radio, stereo, audio equipment, musical instrument, or device producing sound that is plainly audible at 50 feet from the source at any hour. Decibel limits in Tables 6.60.040A and 6.60.040B apply to residential and commercial zones.
View full Castro Valley rules →Sunol, CA
Alameda County
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.
View full Sunol rules →Key Facts Comparison
| Fact | Castro Valley | Sunol |
|---|---|---|
| Jurisdiction | Alameda County (unincorporated) | - |
| Code Reference | Code Ch. 6.60 | - |
| Plainly Audible Rule | 50 feet anytime (Sec. 6.60.050) | - |
| Decibel Tables | 6.60.040A and 6.60.040B | - |
| Residential Night | - | 45–65 dBA (10 PM–7 AM) |
| Residential Day | - | 50–70 dBA (7 AM–10 PM) |
| Tonal Penalty | - | 5 dB reduction for tonal/music noise |
| Code | - | County Code Chapter 6.60 |
Highlighted rows indicate differences between cities.
Castro Valley FAQ
What are Castro Valley's quiet hours?
Castro Valley follows Alameda County Code Chapter 6.60. Any radio, stereo, or audio device that is plainly audible 50 feet from the source is prohibited at any time. Tables 6.60.040A/B set decibel limits that are stricter at night (typically 10 p.m.-7 a.m.).
Who enforces noise complaints in Castro Valley?
The Alameda County Sheriff's Office handles after-hours complaints; Alameda County Environmental Health handles ongoing/stationary noise. Call non-emergency dispatch to file a complaint.
Sunol FAQ
What are the quiet hours in Alameda County?
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.
What happens if I violate the noise ordinance in Alameda County?
Residential Night: 45–65 dBA (10 PM–7 AM). Residential Day: 50–70 dBA (7 AM–10 PM). Tonal Penalty: 5 dB reduction for tonal/music noise. Code: County Code Chapter 6.60.
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