Fremont, CA Data Centers & Crypto Mining: Data Center Noise Limits (2026)
Key Facts
- Code
- Muni Code Sec. 18.50.040(a)(1)
- Industrial neighbor
- Ldn 70 dB(A)
- Home neighbor
- 50 dB(A) day / 45 night
- Lmax cap
- 70 day / 65 night
- Chapter 9.25 status
- Exempts industrial zones
Summary
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.
When users are adjacent or contiguous to residential, institutional uses, or similar sensitive uses, the maximum noise level shall not exceed an hourly Leq level of 50 dB(A) during daytime hours (7:00 a.m. – 10:00 p.m.), an hourly Leq level of 45 dB(A) during nighttime hours (10:00 p.m. – 7:00 a.m.)
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 02-2026, passed May 5, 2026).
Full Breakdown
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.
Violations & Fines
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.
Frequently Asked Questions
How loud can a data center be in Fremont?
Does Fremont's noise ordinance apply to industrial data centers?
Sources & Official References
Other rules in Fremont
California rules heatmap·Compare Fremont to another location·View the California data centers & crypto mining overview
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