Santa Ana has no data-center-specific noise rule, but Municipal Code Sec. 18-312 caps exterior noise reaching any residential property at 55 dB(A) daytime (7 a.m.–10 p.m.) and 50 dB(A) at night (10 p.m.–7 a.m.). A data center's cooling equipment and generators must meet these limits.
The entire city is Noise Zone 1 (Sec. 18-311). Section 18-312 sets exterior noise standards measured on residential property: 55 dB(A) between 7 a.m. and 10 p.m. and 50 dB(A) overnight, though brief bursts are allowed on a sliding scale up to 20 dB(A) over the limit. If the noise is pure-tone, impact, speech, or music, each limit drops 5 dB(A). A data center's chillers, cooling towers, and backup generators must meet these caps at the nearest home. The M1 operational standard in Sec. 41-473(a) separately bars any use from a detrimental noise, light, or vibration effect on adjacent uses. These numbers match unincorporated Orange County's standard, but the City sets and enforces them under its own code.
Exceeding the Sec. 18-312 limits is a violation of the Municipal Code, enforced on a complaint basis and measured at the affected residential property. Each day a violation continues can be treated as a separate offense.
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