Decibel Limits: Chino vs Rancho Cucamonga
How do decibel limits rules compare between Chino, CA and Rancho Cucamonga, CA?
Chino and Rancho Cucamonga have similar restriction levels.
Chino, CA
San Bernardino County
Chino Municipal Code §9.40.040 (Exterior Noise Standards) establishes maximum permitted noise levels at the receiving (residential) property line: 65 dBA during daytime hours (7 a.m. to 10 p.m.) and 55 dBA during nighttime hours (10 p.m. to 7 a.m.). Measurement is per §9.40.020: A-weighted scale, slow response, referenced to 20 micropascals, using a sound level meter that meets ANSI specifications. Noise sources in commercial and industrial zones must comply with the residential standard when measured at the nearest residential property line. The standard is exceeded when the level is exceeded for any 30 minutes in an hour; lower thresholds (typically 5 dBA below the base) apply for shorter cumulative durations (15 min, 5 min, 1 min, instantaneous).
View full Chino rules →Rancho Cucamonga, CA
San Bernardino County
Rancho Cucamonga Municipal Code Chapter 8.17 sets exterior decibel limits by receiving land use. Residential zones are capped around 55 dBA day (7 AM-10 PM) and 45 dBA night (10 PM-7 AM) at the property line.
View full Rancho Cucamonga rules →Key Facts Comparison
| Fact | Chino | Rancho Cucamonga |
|---|---|---|
| Daytime exterior limit (residential) | 65 dBA, 7 a.m.–10 p.m. | - |
| Nighttime exterior limit (residential) | 55 dBA, 10 p.m.–7 a.m. | - |
| Measurement standard | CMC §9.40.020 — A-weighted, slow response, 20 µPa reference | - |
| Duration trigger | Standard violated if exceeded any 30 minutes in any hour | - |
| Pure-tone penalty | +5 dBA added to measured level | - |
| Key exemptions | Emergency, schools, permitted events, aircraft, agricultural ops | - |
| Residential Day | - | About 55 dBA 7 AM-10 PM |
| Residential Night | - | About 45 dBA 10 PM-7 AM |
| Commercial | - | About 60-65 dBA |
| Industrial | - | About 70-75 dBA |
| Measurement | - | At receiving property line |
Highlighted rows indicate differences between cities.
Chino FAQ
How is the 65 dBA limit measured — at my house or at the source?
Per CMC §9.40.020, measurement occurs on the receiving property (the complainant's property line or at a point of human use) using an ANSI Type 2 (or Type 1) sound level meter set to A-weighting, slow response. The reading is taken at least 4 feet above ground and away from reflecting surfaces.
What's a 'pure-tone' penalty?
If the offending noise contains a distinct audible tone (e.g., a whine, hum, or beep) or is cyclically varying or impulsive (banging), CMC §9.40 adds 5 dBA to the measured level before comparing to the limit. So a 60 dBA pure-tone hum is treated as 65 dBA — exactly at the daytime limit and over the nighttime limit.
Rancho Cucamonga FAQ
How loud is 45 dBA?
About the level of a quiet library or soft conversation 10 feet away. That is why nighttime music audible inside a neighbor's home usually violates the ordinance.
Does the city use dBA meters?
Yes. Code Enforcement staff carry calibrated Type 2 sound-level meters for complex or disputed complaints, measured at the property line of the receiving parcel.
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