Bellflower, CA Data Centers & Crypto Mining: Data Center Noise Limits (2026)
Key Facts
- Industrial cap
- 45 decibels, all hours
- Code
- Muni Code Sec. 17.52.170(A)
- Measured at
- Beyond site boundaries
- Weighting
- A-curve, Standard Z 24.3
- Nuisance rule
- Ch. 8.32, 200-foot audibility
Summary
Bellflower caps industrial noise at 45 decibels beyond the site boundary at all hours under Municipal Code Section 17.52.170. That single all-day limit is far tighter than the 70 dBA Los Angeles County allows on unincorporated industrial land.
Noise. No use shall be permitted which creates a sound level beyond the boundaries of the site in excess of 45 decibels. Sound level shall be measured with an instrument which is in accordance with the American Standard for Sound Level Meters, Z 24.3, and response Curve "A" given in this Standard shall be used.
B. Vibration, Heat, Glare, Electrical Disturbance. No use shall be permitted which creates vibration, heat, glare, or electrical disturbance beyond the boundaries of the site.
C. Air Pollution. No use shall be permitted which emits any air pollutant detectable by the human senses without the aid of instruments beyond the boundaries of the site.
D. Emissions. No use shall be permitted which creates emissions which endangers human health, can cause damage to animals, vegetation or other property or which can cause soiling at any point beyond the boundaries of the site.
E. Odor. No use shall be permitted which creates odor detectable by the human senses without the aid of instruments beyond the boundaries of the site. (Prior code § 19-12.7; Ord. 1404 § 5, 12/14/20)
Full Breakdown
Section 17.52.170(A) bars any M-1 use from creating a sound level beyond the site boundaries above 45 decibels, measured on the A-weighted curve of American Standard Z 24.3. Bellflower sets one number for every hour of the day, with no daytime allowance and no separate residential table. Cooling towers, chillers, and generator testing at a data center run continuously, so the 45 dBA property-line cap governs around the clock. Section 17.52.170 also bars vibration, heat, glare, and electrical disturbance beyond the site. Chapter 8.32 adds a nuisance layer: noise audible beyond 200 feet of the property line in or within 500 feet of a residential zone violates the code.
Violations & Fines
Exceeding 45 dBA at the M-1 site boundary violates Title 17 and is enforced by Bellflower Code Enforcement through notices, citations, and abatement, with Chapter 8.32 nuisance charges available separately.
Frequently Asked Questions
How loud can a data center be in Bellflower?
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Sources & Official References
Other rules in Bellflower
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