Merced's industrial performance standards cap noise beyond the property line at 70 dBA from 7 a.m. to 9 p.m. and 60 dBA overnight. A use abutting residential zoning may transmit no noise from 10 p.m. to 7 a.m.
Municipal Code Section 20.12.030.C.1 applies to all land uses and structures in the I-L and I-H districts, so data-center chillers, cooling towers, and backup generators fall under it. The cap is 70 dBA beyond the property line between 7:00 a.m. and 9:00 p.m. and 60 dBA between 9:00 p.m. and 7:00 a.m. A use abutting residential zoning may transmit no noise beyond the property line from 10:00 p.m. to 7:00 a.m. An applicant whose operation exceeds the stated level must submit a noise mitigation plan to obtain building permits. Merced County instead measures 65 dBA Ldn beside homes.
Exceeding the Section 20.12.030 limits blocks building permit issuance without a mitigation plan and breaches the noise conditions attached to a site plan review or conditional use permit.
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See how Merced's data center noise limits rules stack up against other locations.
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