Ventura County caps stationary-source noise at a noise-sensitive use at 55 dBA Leq daytime, 50 dBA evening, and 45 dBA at night, or ambient plus 3 dBA if higher. Data-center cooling and generators are held to these General Plan limits through permit conditions.
Unincorporated Ventura County regulates continuous, non-transportation noise through Policy HAZ-9.2.4 of the 2040 General Plan Hazards and Safety Element, applied to projects during permit and CEQA review. The exterior standard at a noise-sensitive receptor — homes, schools, hospitals, places of worship — is an hourly Leq of 55 dBA from 6 a.m. to 7 p.m., 50 dBA from 7 p.m. to 10 p.m., and 45 dBA from 10 p.m. to 6 a.m., or the ambient level plus 3 dBA, whichever is greater, measured at the exterior wall of the affected building. A data center's chillers, cooling fans, and backup-generator testing are engineered and conditioned to stay within these figures. A separate Construction Noise Control Plan governs the build phase.
Noise exceeding a project's HAZ-9.2.4 permit conditions is a permit violation. The county can require additional mitigation, issue notices of violation through code compliance, and, for continued noncompliance, move to revoke the discretionary permit.
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Side-by-side rule comparisons with other cities in Ventura County.
See how other cities in Ventura County handle data center noise limits.
See how Ojai's data center noise limits rules stack up against other locations.
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