Quiet hours in Colusa County, CA — also called the noise ordinance, nighttime noise rules, or residential quiet time — define the hours during which excessive noise is prohibited.
Unincorporated Colusa County sets nighttime noise limits under Chapter 13 of the County Code (Ord. No. 730). Residential property limits drop to 50 dBA from 9 p.m. to 7 a.m. (55 dBA daytime). Sound audible inside a neighbor's home is restricted, with permission presumed only between 9 a.m. and 10 p.m. Sunday-Thursday, extended to 12:30 a.m. Friday and Saturday.
Colusa County's quiet-hours framework lives in Chapter 13 (Noise Regulations) of the County Code, adopted by the Board of Supervisors as Ordinance No. 730, which declares the county a 'quiet county.' Section 13-6 and Table No. 1 set a residential nighttime maximum noise level of 50 dBA between 9:00 p.m. and 7:00 a.m., versus 55 dBA during the 7 a.m.-9 p.m. daytime period, measured at the complainant's property plane closest to the noise source. Agricultural, commercial, and industrial land uses get 55 dBA at night (10 p.m.-7 a.m.) and 60 dBA daytime. Separately, Section 13-6(c) restricts any sound audible inside a neighbor's dwelling unit; consent is presumed only between 9 a.m. and 10 p.m. Sunday through Thursday, and 9 a.m. to 12:30 a.m. the following day on Friday and Saturday, and any affected resident may withdraw that consent at any time, in writing or verbally, or by asking the county sheriff to notify the noise-maker. These rules apply in unincorporated communities such as Arbuckle, Maxwell, Grimes, Princeton, Stonyford, College City, Sites, and Lodoga; the incorporated cities of Colusa and Williams enforce their own codes. The Colusa County Sheriff's Office handles enforcement.
A violation is a misdemeanor under Section 13-3, punishable by a fine, with each day a separate offense; the first two violations within a year are misdemeanors and a third within a year can bring a fine and/or jail under California Penal Code Section 19 (up to $1,000 and/or six months). Per Chapter 42 (Section 42-13), a County Code violation may be charged as a misdemeanor (up to $1,000 and/or six months) or as an infraction ($100 first offense, $200 second, $500 each additional within a year).
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