Colusa County caps noise at 50 dBA at night and 55 dBA daytime at the nearest home's property line under its noise ordinance (Chapter 13, Ord. No. 730). A data center's cooling systems and generators must meet these limits, plus a 60 dB zoning cap at adjacent non-industrial property lines.
Colusa County has adopted a countywide noise ordinance (Chapter 13, Ord. No. 730) that designates the county 'a quiet county.' Table No. 1 (Section 13-6) limits noise at the complainant's property plane to 50 dBA (9 p.m. to 7 a.m.) and 55 dBA (7 a.m. to 9 p.m.) where the affected land is residential, and 55/60 dBA where it is agricultural, commercial, or industrial. Section 13-7 caps any source at 20 dBA above the limit, never exceeding 80 dBA. Zoning Code Section 44-2.50.20 separately bars industrial uses from exceeding 60 dB at adjacent non-industrial property lines. For a data center, continuously running chillers and generator testing are the concern; the county can require enclosures and setbacks as permit conditions.
Noise-ordinance violations are misdemeanors under Section 13-3; the first two within a year draw fines, a third can bring jail. Each day is a separate offense, and the noise is a public nuisance subject to abatement or injunction.
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See how Colusa County's data center noise limits rules stack up against other locations.
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