Rialto, CA Noise Ordinances: Decibel Limits (2026)
Key Facts
- Commercial/industrial zone sounds
- Exempt if necessary and incidental
- RSP operations near homes
- Prohibited 11:00 p.m. to 6:00 a.m.
- RSP loading near homes
- Prohibited 10:00 p.m. to 6:00 a.m.
- Diesel idling limit
- 5 minutes
- Loading near residences citywide
- 7:00 a.m. to 8:00 p.m. only
Summary
Sounds necessary and incidental to permitted uses in Rialto's commercial and industrial zones are exempt from the noise ordinance, but Renaissance Specific Plan standards bar operations next to residential areas from 11:00 p.m. to 6:00 a.m. and loading from 10:00 p.m. to 6:00 a.m.
Operational Restrictions: No commercial or industrial activity located immediately adjacent to a residentially zoned area (e.g. not separated by a street or park) shall be permitted to operate between the hours of 11:00 p.m. and 6:00 a.m. and loading activities shall not be permitted between the hours of 10:00 p.m. and 6:00 a.m. ... Noise Control: The driver of any diesel vehicle: (1) shall not idle the vehicle's primary diesel engine for greater than 5 minutes at any location; and (2) shall not idle a diesel fueled auxiliary power system for more than 5 minutes to power a heater, air conditioner, or any ancillary equipment on the vehicle if it has a sleeper berth and the truck is located within 100 feet of a restricted area (homes and schools) ... Noise control must comply with Chapter 9.50 of the Rialto Municipal Code.
Full Breakdown
Section 9.50.060 exempts sounds generated in commercial and industrial zones that are necessary and incidental to the uses permitted there, and refers commercial and industrial performance standards to Title 18 (zoning). Within the Renaissance Specific Plan area, business development standards prohibit commercial or industrial activity immediately adjacent to residentially zoned areas between 11:00 p.m. and 6:00 a.m., ban loading activities between 10:00 p.m. and 6:00 a.m., limit diesel engine and auxiliary power idling to five minutes, and require anti-idling signage citing 13 CCR 2485. Citywide, Section 9.50.050 restricts loading, unloading, and forklift operation causing impulsive or raucous noise within 1,000 feet of a residence to 7:00 a.m.-8:00 p.m.
Violations & Fines
Citywide controlled-hours violations are infractions with $250 to $1,000 fines under Sections 9.50.110 and 9.50.130. Renaissance Specific Plan operational standards are enforced through the city's planning entitlements and code enforcement.
Frequently Asked Questions
Are businesses exempt from Rialto's noise ordinance?
Can warehouses near homes in Rialto operate overnight?
Sources & Official References
Other rules in Rialto
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Decibel Limits in Nearby Cities
How other cities in San Bernardino County handle decibel limits.