Santa Monica Municipal Code Chapter 4.12 caps exterior noise at the property line. Residential Zone I limits are 60 dBA daytime and 50 dBA overnight; industrial Zone III is 70 dBA at any hour. A data center's cooling and generators must meet the nearest zone's limit.
Section 4.12.060 sets exterior noise standards by zone, measured as a 15-minute average (Leq). Residential Zone I allows 60 dBA from 7 a.m. to 10 p.m. and 50 dBA overnight; commercial Zone II allows 65 dBA day and 60 dBA night; manufacturing Zone III allows 70 dBA at any time. Impulsive or tonal noise drops the limit by 5 dBA. Where a parcel lies within 100 feet of a stricter zone, the limit becomes the average of the two. A data center's continuous chillers and backup generators are modeled against the nearest home, so the 50 dBA overnight residential floor governs where IC or OC land abuts housing.
Exceeding the Section 4.12.060 limits is a violation enforced by the City's Community Noise Officer through citations, and for a permitted data center, breach of the noise conditions in its Conditional Use Permit.
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