Quiet hours in Chino, CA — also called the noise ordinance, nighttime noise rules, or residential quiet time — define the hours during which excessive noise is prohibited.
Chino does not impose a strict bedtime curfew on residents, but Chino Municipal Code Chapter 9.40 (Noise) sets enforceable A-weighted decibel limits at the receiving residential property line that drop 5 dB between 10:00 p.m. and 7:00 a.m. Section 9.40.040 (Exterior Noise Standards) caps continuous noise (L50) at 55 dBA daytime / 50 dBA nighttime, with maximum (Lmax) of 75 dBA daytime / 70 dBA nighttime.
CMC § 9.40.040 establishes a tiered exterior noise standard measured at residential property lines: 30 min/hr (L50) 55 dBA day / 50 dBA night; 15 min/hr (L25) 60/55; 5 min/hr (L08) 65/60; 1 min/hr (L02) 70/65; any period (Lmax) 75/70. Daytime is 7:00 a.m. to 10:00 p.m.; nighttime is 10:00 p.m. to 7:00 a.m. (per City of Chino General Plan EIR Section 4.10, Table 4.10-5, summarizing CMC § 9.40.040). The ordinance is enforced as a public nuisance and complaint-driven via Chino Police non-emergency dispatch. Loud or unruly gatherings on private property are separately regulated under CMC Chapter 9.36 (as amended by Ordinance No. 2019-005), which imposes escalating administrative fines on the responsible party without a numeric decibel test.
Noise above the table limits is an infraction under Title 9 and a public nuisance. Loud-gathering violations under CMC Chapter 9.36 (amended by Ord. 2019-005, eff. 2019): written warning first response; $250 second response; $500 third response; $750 fourth response, cumulative within a 72-hour period (up to $1,500 for four calls). Parents responsible if the host is a minor.
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Side-by-side rule comparisons with other cities in San Bernardino County.
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