San Diego County, CA Data Centers & Crypto Mining: Data Center Noise Limits (2026)
Key Facts
- Code
- County Code Sec. 36.404
- Residential Limit
- 50 dB(A) day / 45 night
- Industrial Limit
- 65 dB(A) (M50/M52/M54)
- Measured At
- Source or receiving property line
- Compliance
- Via Major Use Permit noise study
Summary
San Diego County caps one-hour average sound at the receiving property line: 50 dB(A) daytime and 45 dB(A) at night for homes, and 70 dB(A) for M50/M52/M54 industrial property. A data center's Major Use Permit ties compliance to a required noise study.
it shall be unlawful for any person to cause or allow the creation of any noise, which exceeds the one-hour average sound level limits in Table 36.404, when the one-hour average sound level is measured at the property line of the property on which the noise is produced or at any location on a property that is receiving the noise.
TABLE 36.404 SOUND LEVEL LIMITS IN DECIBELS (dBA) ZONE TIME ONE-HOUR AVERAGE SOUND LEVEL LIMITS (dBA) ONE- HOUR AVERAGE ZONE TIME SOUND LEVEL LIMITS (dBA)
7 a.m.
(1) RS, RD, RR, RMH, A70, A72, S80, S81, S90, S92, RV, and RU with a to 10 50 General Plan Land Use Designation density of less than 10.9 dwelling units p.m. per acre. 10 p.m. to 7 45
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-141: Administrative: Current through Ord. No. 11007 (N.S.), effective 7-10-26 | Regulatory: Current through Ord. No. 11008 (N.S.), effective 7-24-26).
Full Breakdown
County Code Sec. 36.404 sets one-hour average sound level limits measured at the property line of the source or at any receiving property. Residential zones are limited to 50 dB(A) from 7 a.m. to 10 p.m. and 45 dB(A) overnight; commercial property to 60 dB(A) daytime and 55 dB(A) overnight; and land in the M50, M52, and M54 industrial zones to 70 dB(A) at any time (S82, M56, and M58 get 75 dB(A)). Because a large data center needs a Major Use Permit, Sec. 36.404(b) lets a noise study's mitigation measures, once made conditions of that permit, constitute compliance. Cooling towers and generators are modeled against the nearest receiver's limit.
Violations & Fines
Noise exceeding the Sec. 36.404 limits is enforced by County Code Compliance. For a permitted data center, breaching the noise conditions of its Major Use Permit is a permit violation that can trigger enforcement and revocation.
Frequently Asked Questions
How loud can a data center be in unincorporated San Diego County?
Does a data center have to prove it will meet noise limits?
Sources & Official References
Other rules in San Diego County
California rules heatmap·Compare San Diego County to another location·View the California data centers & crypto mining overview
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