Union City, CA Noise from Specific Sources: Generator Noise (2026)
Key Facts
- Residential limit
- 10 dBA above ambient noise
- Measured at
- property line, precision sound meter
- Enforced by
- Planning Dept. noise complaints
- Daytime exception
- 8am-8pm (10am-6pm Sun/holiday)
Summary
Union City bars any machine, including a generator, from causing a 'noise disturbance,' and caps added sound on residential lots at 10 dBA above the ambient level measured at the property line.
No person shall produce, suffer or allow to be produced by any machine, animal or device, or any combination of same, any noise disturbance. (Ord. 275-86 § 1, 1986) § 9.40.041. Residential property noise limits. No person shall produce, suffer or allow to be produced by any machine, animal or device, or any combination of same, on residential property, a noise level more than 10 dBA above the local ambient at any point outside of the property plane. (Ord. 275-86 § 1, 1986)
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4940544; v16 updated 2026-06-23).
Full Breakdown
Chapter 9.40 (Union City Community Noise Ordinance) bans any machine, animal, or device from producing a 'noise disturbance,' a standard enforced through the Planning Department's complaint process and weighed using factors like proximity to residential sleeping areas and time of day. Section 9.40.041 sets the objective backstop for residential property: no more than 10 dBA above the local ambient noise level at any point outside the property line, measured with a precision sound level meter. A backup or portable generator on a house lot has to stay under that ceiling, though the daytime exception in § 9.40.050 relaxes the separate 70 dBA/25-foot threshold between 8 a.m. and 8 p.m.
Violations & Fines
Violating the noise ordinance is enforceable as a misdemeanor under Chapter 1.16's citywide penalty rules, up to a $1,000 fine, six months in jail, or both, unless charged as a lesser infraction.
Frequently Asked Questions
Can I run a generator at night in Union City?
Who handles generator noise complaints?
Sources & Official References
Other rules in Union City
California rules heatmap·Compare Union City to another location·View the California noise from specific sources overview
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How other cities in Alameda County handle generator noise.