Quiet hours in Fairfield, CA — also called the noise ordinance, nighttime noise rules, or residential quiet time — define the hours during which excessive noise is prohibited.
Fairfield Municipal Code Chapter 25, Article X sets exterior noise standards measured at the property line of the receiving property. Residential receiving uses are protected to roughly 60 dBA during the day (7 a.m.–10 p.m.) and 55 dBA at night (10 p.m.–7 a.m.). General disturbance of the peace is also enforceable any hour under Fairfield Municipal Code Chapter 12 and California Penal Code §415.
Fairfield's quantitative noise standards live in the city's Zoning Ordinance (Chapter 25, Article X). Section 25.1401 makes it unlawful for any person to create noise that exceeds the levels in Table 25.1401 at any neighboring property. The table protects residential receiving uses to about 60 dBA Leq during daytime hours (7 a.m. to 10 p.m.) and 55 dBA Leq at night (10 p.m. to 7 a.m.), measured at the property line. Higher Lmax thresholds apply for short events, and the standards are reduced 5 dB for simple-tone, speech, music, or impulsive noise. Loading, unloading, or delivery by large trucks or tractor-trailers adjacent to a residential use is prohibited from 10:00 p.m. to 7:00 a.m. where it would exceed Table 25.1401 Lmax thresholds. Independently, Chapter 12 (Offenses — Miscellaneous) carries forward the general disturbing-the-peace rule, mirroring California Penal Code §415, which makes it a misdemeanor any hour to maliciously and willfully disturb another person by loud and unreasonable noise. Fairfield Police Department patrol handles active complaints; Code Enforcement (under Police Support Services) handles chronic nuisances.
A violation of Chapter 25 Article X is a code-enforcement matter punishable by administrative citation under Fairfield's general penalty provisions; late penalties add 50% if a fine is unpaid 30 days after service. Disturbing-the-peace citations under Chapter 12 or California Penal Code §415 are misdemeanors carrying up to 90 days jail and/or a $400 fine.
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