Merced County's Zoning Code performance standards cap mechanical-equipment noise at any property line at 65 dBA Ldn (75 Lmax) next to a residential use and 70 dBA Ldn (80 Lmax) elsewhere. Data center cooling equipment and backup generators must meet these limits.
Merced County has no noise rule written for data centers, so a facility's chillers, cooling fans, compressors, and diesel backup generators are held to the countywide performance standards in Section 18.40.050 of the Zoning Code, which work alongside County Code Chapter 10.60 (Noise Control) and the 2030 General Plan. For noise-generating mechanical equipment measured at any parcel boundary line: where the use is adjacent to a residential use or residentially zoned parcel, noise may not exceed 65 dBA Ldn or 75 dBA Lmax; where it is not, the limit is 70 dBA Ldn or 80 dBA Lmax.
Cooling or generator noise exceeding 65 dBA Ldn at a residential boundary, or 70 dBA Ldn elsewhere, violates Section 18.40.050; the county can issue notices of violation and require abatement or acoustic mitigation.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Merced County's data center noise limits rules stack up against other locations.
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