Humboldt County, CA Data Centers & Crypto Mining: Data Center Noise Limits (2026)
Key Facts
- Residential Night Limit
- 60 dBA (10pm-6am)
- Residential Day Limit
- 65 dBA (6am-10pm)
- Industrial ML/MB Limit
- 75 day / 65 night dBA
- Governing Standard
- General Plan N-S7 (2017)
- Enforced Via
- CEQA + Use Permit conditions
Summary
Humboldt County has no data-center or standalone noise ordinance. A facility's cooling and generators are held to the General Plan Noise Element short-term standards (Policy N-S7): 65 dBA by day and 60 dBA at night at a residential property line, applied through CEQA and Use Permit conditions.
The following noise standards, unless otherwise specifically indicated, shall apply to all property within their assigned noise zones and such standards shall constitute the maximum permissible noise level within the respective zones.
Official source re-checked September 8, 2026: the cited page had not changed since it was quoted.
Full Breakdown
Humboldt County has no noise ordinance written for data centers; the binding numeric limits live in the General Plan Noise Element (Part 4, Chapter 13), adopted October 23, 2017. Policy N-S7 sets short-term (Lmax) standards by zone, measured A-weighted at the property line, with day running 6 a.m. to 10 p.m. and night 10 p.m. to 6 a.m. Industrial ML and MB land is capped at 75 dBA day and 65 night, MG and MH land at 80 and 70, and residential zones at 65 and 60. Because a data center runs around the clock, the 60 dBA nighttime residential limit binds its cooling equipment; a project likely to exceed the standards must submit a noise study under Policy N-S4.
Violations & Fines
Cooling or generator noise above the applicable zone limit, 60 dBA at night at a residential property line, measured A-weighted at the property line between the source and the nearest home.
Frequently Asked Questions
How loud can a data center be at night in Humboldt County?
Does Humboldt County have a separate noise ordinance?
Sources & Official References
Other rules in Humboldt County
California rules heatmap·Compare Humboldt County to another location·View the California data centers & crypto mining overview
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