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Humboldt County, CA Data Centers & Crypto Mining: Data Center Noise Limits (2026)

Significant Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 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.

These county ordinances apply to unincorporated areas of Humboldt County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

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.

Source: Humboldt County Code — Title III Div. 1 Zoning (Ch. 314 non-coastal, Ch. 313 coastal) & General Plan Ch. 13 Noise ElementView official code

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?
At a neighboring residential property line, no more than 60 dBA between 10 p.m. and 6 a.m. under General Plan Noise Element Policy N-S7. The daytime residential cap is 65 dBA.
Does Humboldt County have a separate noise ordinance?
No standalone noise-control ordinance with numeric limits. The county enforces the General Plan Noise Element's short-term dBA standards through CEQA review and conditions attached to a data center's discretionary Use Permit.

Sources & Official References

Other rules in Humboldt County

Noise Ordinances: Quiet HoursSome RestrictionsNoise Ordinances: Construction HoursSignificant RestrictionsData Center Zoning & SitingSignificant RestrictionsNoise Ordinances: Aircraft NoiseLight RestrictionsNoise Ordinances: Barking DogsSome RestrictionsNoise Ordinances: Amplified Music & Outdoor SoundSignificant RestrictionsParking Rules: Abandoned VehiclesLight Restrictions

All Humboldt County rules

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