Mendocino County's noise ordinance (County Code Chapter 8.100, Ordinance No. 4558, adopted April 7, 2026) caps nighttime noise at 60 dBA continuous and 75 dBA intermittent, measured at an adjacent residential property line between 10 p.m. and 7 a.m. Data center cooling and generators must meet these limits.
Mendocino County has no noise rule written for data centers, so a facility's cooling fans, chillers, and backup generators fall under the countywide noise ordinance in Chapter 8.100, added by Ordinance No. 4558 on April 7, 2026. Between 10 p.m. and 7 a.m., machinery noise may not exceed 60 decibels for continuous sound or 75 decibels for intermittent sound, measured at an adjacent residential property line. The ordinance sets numeric limits only for those nighttime hours; daytime stationary noise is instead addressed through CEQA analysis and use-permit conditions. Because a data center runs around the clock, the 60 dBA nighttime cap is the binding constraint on its cooling equipment.
Continuous noise above 60 dBA or intermittent noise above 75 dBA at an adjacent residential property line between 10 p.m. and 7 a.m.
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