Yolo County has no stationary-source noise ordinance covering data centers. Cooling systems and backup generators are controlled through CEQA review against the 2030 Countywide General Plan Noise Element and through Site Plan Review conditions. The county's only numeric noise limits in code apply to surface mining, not data centers.
Yolo County's code has no general noise ordinance setting decibel limits for industrial or commercial uses. The only numeric noise standards, in the Off-Channel Surface Mining chapter (Sec. 10-4.421) and the Agricultural Surface Mining and Reclamation Ordinance (Sec. 10-8.416), govern mining operations, not data centers. A data center's chillers, cooling towers, and diesel backup generators are instead evaluated case by case under CEQA against the 2030 Countywide General Plan Noise Element, which sets residential noise-compatibility standards, and conditioned through Site Plan Review. Typical mitigations imposed as project conditions include acoustic enclosures, barrier walls, and exhaust silencers, especially where a facility sits near homes or other noise-sensitive uses.
A data center whose cooling or generator noise breaches the noise conditions set in its Site Plan Review approval or CEQA mitigation faces Yolo County Planning Division enforcement, mitigation orders, and possible permit revocation until noise is brought within limits.
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