Fremont's general noise ordinance (Chapter 9.25) exempts industrial districts, so data-center noise is capped by the industrial zoning performance standard, Section 18.50.040. At the property line the limit is Ldn 70 dB(A) beside industry, and Leq 50 dB(A) daytime / 45 dB(A) nighttime beside homes.
Fremont Municipal Code Section 9.25.040(f) exempts the I-S, I-T, and G-I industrial zones from the general noise ordinance, so a data center's noise is governed by the industrial performance standards in Section 18.50.040(a)(1). Measured at any property line: Ldn 70 dB(A) where the neighbor is industrial, commercial, or office; Ldn 65 dB(A) beside lodging or parks; and beside residential or sensitive uses, hourly Leq 50 dB(A) day (7 a.m.-10 p.m.), 45 dB(A) night (10 p.m.-7 a.m.), with Lmax caps of 70 day and 65 night. Tonal, speech, music, or impulsive noise near homes drops the limit 5 dB(A). The building official enforces.
Noise exceeding the Section 18.50.040 property-line limits is a performance-standard violation abated by the building official through citations, abatement action, or injunction; permit conditions may impose stricter caps.
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