Sonoma Municipal Code 9.56.040 caps constant noise - the kind data-center cooling makes - at 55 dBA on commercial property, and 50 dBA daytime and 40 dBA nighttime on residential property, measured on the receiving property.
SMC 9.56.040 sets noise limits by receiving property, not by the source. On residential property the cap is 60 dBA intermittent and 50 dBA constant in the daytime, dropping to 50 dBA intermittent and 40 dBA constant at night. Mixed use property allows 65/55 daytime and 55/45 nighttime. Commercial property is capped at 65 dBA intermittent or 55 dBA constant at all hours unless a use permit authorizes more. Daytime runs 7:00 a.m. to 9:00 p.m. Sunday through Thursday and to 10:00 p.m. Friday and Saturday. Chillers and generators run continuously, so the 40 dBA nighttime constant limit at homes is the binding constraint.
A violation of Chapter 9.56 may be enforced as an infraction or as a misdemeanor, or by any other remedy available to the city under this code or state law.
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See how Sonoma's data center noise limits rules stack up against other locations.
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