Alpine County has no standalone noise ordinance. Stationary sources like data-center cooling and generators are held to the General Plan Noise Element, Policy 24b: 50 dB hourly Leq daytime and 45 dB at night, measured at the property line of a home, school, hospital, or library.
Alpine County does not have a separate countywide noise ordinance. Noise is governed by the General Plan's Safety Element, Section E (Noise), applied to new projects through CEQA and use-permit conditions. Policy 24b sets performance standards for non-transportation (stationary) sources: 50 dB hourly Leq with a 70 dB maximum from 7 a.m. to 10 p.m., dropping to 45 dB Leq and a 65 dB maximum from 10 p.m. to 7 a.m. The limits are measured immediately at the property line of noise-sensitive uses — hospitals, clinics, schools, libraries, and residences. A data center's chillers, cooling fans, and generator testing would be conditioned to meet these figures. The Planning Commission may allow temporary exceedances for short-term activities.
There is no noise-ordinance fine schedule. A data center that exceeds its permit's noise conditions faces use-permit enforcement — the county can require added mitigation, issue notices of violation, and ultimately revoke the permit for continued noncompliance.
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See how Alpine County's data center noise limits rules stack up against other locations.
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