Decibel Limits: Ontario vs San Bernardino
How do decibel limits rules compare between Ontario, CA and San Bernardino, CA?
Ontario and San Bernardino have similar restriction levels.
Ontario, CA
San Bernardino County
Ontario applies exterior decibel standards set in zoning and noise rules. Residential limits are about 55 dBA daytime and 50 dBA nighttime at the property line, with higher limits in commercial and industrial zones.
View full Ontario rules →San Bernardino, CA
San Bernardino County
San Bernardino sets exterior limits of about 55 dBA day and 50 dBA night in residential zones, 65 dBA in commercial, and 70 to 75 dBA in industrial zones under Development Code 19.20.030(15).
View full San Bernardino rules →Key Facts Comparison
| Fact | Ontario | San Bernardino |
|---|---|---|
| Daytime Residential | about 55 dBA | - |
| Nighttime Residential | about 50 dBA | - |
| Measurement | At receiving property line | - |
| Adjustments | Impulsive or tonal reductions | - |
| Enforcement | Code Enforcement meter readings | - |
| Residential Day | - | 55 dBA |
| Residential Night | - | 50 dBA |
| Commercial | - | About 65 dBA |
| Industrial | - | 70 to 75 dBA |
| Method | - | Type 2 meter at property line |
Highlighted rows indicate differences between cities.
Ontario FAQ
What is the legal noise level in Ontario residential zones?
Typically about 55 dBA during the day and 50 dBA at night measured at the receiving property line, with stricter limits for impulsive or tonal sound.
How does the city prove a decibel violation?
Code Enforcement uses a calibrated meter at the property line, averages readings, and considers any tonal or impulsive adjustments before issuing a citation.
San Bernardino FAQ
How is the limit measured?
Code Enforcement uses a calibrated Type 2 sound-level meter at the property line, following CEQA noise protocols.
What if background noise already exceeds the limit?
An ambient-adjusted baseline may apply so enforcement focuses on the added noise from the specific source.
Compare other topics
See how Ontario and San Bernardino compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool