Kern County's Zoning Ordinance caps stationary commercial and industrial noise at 65 dB Ldn measured at the nearest home when a use sits within 500 feet of residential zoning (Section 19.80.030.S). A data center's chillers, cooling fans, and backup generators must meet this exterior standard.
Kern County writes its numeric noise standard into the Zoning Ordinance rather than a standalone chapter. Under Section 19.80.030.S, all non-mobile (stationary) noise sources from commercial and industrial uses, except those in the M-3 Heavy Industrial District, that sit within 500 feet of residentially zoned or developed land (E, R-1, R-2, R-3) may not generate noise exceeding an average of 65 dB Ldn between 7 a.m. and 10 p.m., and at night (10 p.m.-7 a.m.) may not exceed 65 dB or a 5 dB increase over ambient, whichever is greater. Measurements are taken with an A-weighted meter at the exterior of the closest residential dwelling.
Cooling or generator noise above 65 dB Ldn at a nearby home, or above the nighttime ambient-plus-5 dB level, violates Section 19.80.030.S; the Planning Director can require noise attenuation measures and code enforcement can compel abatement.
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