Quiet hours in Rialto, CA — also called the noise ordinance, nighttime noise rules, or residential quiet time — define the hours during which excessive noise is prohibited.
Rialto Municipal Code Chapter 9.50 (Noise Control) prohibits unreasonably loud, unnecessary or unusual noise that disturbs the peace at any hour, and sets two nighttime thresholds for amplified sound: 'plainly audible' at 50 ft between 8 a.m.–10 p.m. and at 25 ft between 10 p.m.–8 a.m.
Rialto does not impose a flat 'curfew' on all sound. Instead, RMC §9.50.030(A)(4) makes it unlawful to operate music or sound-amplification equipment that is plainly audible across any property line, through party walls between residences, plainly audible at 50 feet from 8 a.m. to 10 p.m., or plainly audible at 25 feet from 10 p.m. to 8 a.m. Section 9.50.030(A)(7) separately bans any 'unreasonably loud, unnecessary or unusual noise' that disturbs a reasonable person of normal sensitivity, weighing factors such as time of day, duration, zoning, and proximity to sleeping areas. 'Plainly audible' is defined in §9.50.020 — for music, an officer only needs to detect the bass vibration, not identify the song. First violations of §9.50.030 are infractions; §9.50.130 sets fines at up to $250 (1st), $500 (2nd in 12 months), $750 (3rd), and $1,000 for 4th+ offenses.
Infraction under RMC §9.50.110. First written warning may be issued under §9.50.030(D); a second violation within 72 hours can trigger criminal citation, public-nuisance notice, and confiscation of the amplifying equipment as evidence (§9.50.030(E)). Cost-recovery 'response charge' under §9.50.090 makes the responsible person liable for the actual cost of each follow-up police response within 72 hours of a written warning. Fines escalate to $1,000 per offense for the 4th violation within 12 months (§9.50.130).
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Side-by-side rule comparisons with other cities in San Bernardino County.
See how other cities in San Bernardino County handle quiet hours.
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