Modoc County has no stand-alone noise ordinance with decibel limits. Instead the General Plan Noise Element sets the standard: exterior noise at homes must stay at or below 60 dB Ldn (65 where infeasible) and interior 45 dB Ldn. A data center is held to these through CEQA review.
Title 9 of the county code contains no noise-control chapter, and the Industrial-Light zone's performance standards (Section 18.50.060) bar detectable vibration, glare, and radio interference but set no decibel figure. The binding numbers live in the Modoc County General Plan Noise Element. Areas above 60 dB Ldn are designated noise-impacted; new noise-sensitive uses must be mitigated to 60 dB Ldn exterior (up to 65 where infeasible) and 45 dB Ldn interior. Because a data center's chillers, cooling fans, and generator testing are continuous noise sources, a CEQA acoustical analysis conditions the project so nearby residences are not pushed above these levels. Policy N.G. notes a dedicated noise ordinance would be developed only if needed.
A data center whose noise pushes a neighboring residence above the General Plan's 60-65 dB Ldn thresholds violates the conditions of its use permit and CEQA mitigation. Planning can require added mitigation, impose fines, or revoke the permit.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Modoc County's data center noise limits rules stack up against other locations.
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