Roseville caps fixed-source noise at a sensitive receptor's property line at 50 dBA daytime (7 a.m.-10 p.m.) and 45 dBA at night, per Municipal Code Chapter 9.24. Industrial sources abutting homes get a 7 dBA allowance; data-center cooling and generators must comply.
Roseville's Noise Regulation ordinance, Municipal Code Chapter 9.24, is the city's own standard - not Placer County's. Section 9.24.100 makes it unlawful for a fixed sound source to exceed, at an affected sensitive receptor's property line, either the ambient level by three dBA or the Table 1 standard by three dBA, whichever is greater. Table 1 sets an hourly Leq of 50 dBA daytime (7 a.m. to 10 p.m.) and 45 dBA nighttime (10 p.m. to 7 a.m.). Section 9.24.120 gives industrial-zoned land that abuts or faces a sensitive receptor a larger seven dBA allowance. A data center's chillers, cooling towers, and backup diesel generators are modeled against these limits at the nearest home.
Exceeding the Chapter 9.24 limits is unlawful and enforced by the city; for a permitted data center it also breaches the noise conditions attached to its Conditional Use Permit.
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See how Roseville's data center noise limits rules stack up against other locations.
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