Monterey, CA Noise from Specific Sources: Generator Noise (2026)

Monterey's zoning performance standards at § 38-111(A) normally cap ambient noise at 60 decibels in residential zones, dropping to 55 decibels overnight, but subsection 5(a) carves out a specific exception for emergency generators and other standby machinery or equipment necessarily operated during an emergency, as that term is defined in Monterey City Code § 22-18(a)(1): a sudden, unforeseen event such as an earthquake, flood, fire, storm, or an unanticipated power outage beyond the property owner's or occupant's control. The exemption is not unconditional. A generator excused under this section cannot be located within any required front yard setback, keeping backup power equipment out of the most visible, street-facing part of a lot.

Any generator installed within 10 feet of a property line must use noise reduction enclosures and soundproofing materials or products built for generator soundproofing, so a unit placed close to a neighbor's fence line cannot simply run at full volume during an extended outage. The companion noise-nuisance statute in Chapter 22, § 22-18(c), separately exempts noise from portable emergency generators used during power outages, and from chain saws or tree-removal equipment used to abate storm damage, from the general prohibition on noise that habitually disturbs the peace and quiet of others.

Both provisions were added or amended by Ordinance 3683 in 2024, reflecting the city's response to public-safety power shutoff events on the Peninsula. Outside a genuine emergency, generator noise is not exempt and is measured against the standard decibel limits like any other noise source.