Humboldt County, CA Data Centers & Crypto Mining: Data Center Zoning & Siting (2026)
Key Facts
- Dedicated Ordinance
- None; general industrial zoning
- Allowed Districts
- ML, MH, MG (MB coastal)
- Approval
- Use Permit + CEQA review
- Coastal Zone
- Coastal Development Permit required
- Jurisdiction
- Unincorporated county only
Summary
Humboldt County has no dedicated data center ordinance. In the unincorporated county a data center is an industrial use for the ML, MG, or MH districts, needing a Use Permit, CEQA review, and, in the coastal zone, a Coastal Development Permit.
The Limited Industrial or ML Zone is intended to apply to areas in which light manufacturing and heavy commercial uses of the non-nuisance type and large administrative facilities are permitted.
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 2788, passed May 12, 2026).
Full Breakdown
Unincorporated Humboldt County regulates data centers only through general industrial zoning, not a data-center-specific chapter. Land use runs under two regimes: County Code Chapter 314 outside the coastal zone and Chapter 313 inside it. A server or computing facility is an industrial use, sited in the Limited Industrial (ML), Heavy Industrial (MH), or Industrial General (MG) districts; the ML zone is meant for light manufacturing and large administrative facilities of the non-nuisance type. A facility of utility scale requires a discretionary Use Permit, which triggers CEQA review of water, power, traffic, and noise. Because Humboldt is a coastal county, any site inside the Coastal Zone also needs a Coastal Development Permit under the county's certified Local Coastal Program.
Violations & Fines
Building a data center outside a designated industrial zone, or without a required Use Permit, CEQA clearance, or (in the Coastal Zone) a Coastal Development Permit, is a zoning violation that can halt the project until it conforms.
Frequently Asked Questions
Where can a data center be built in unincorporated Humboldt County?
Does the county zoning code apply inside Eureka, Arcata, or Fortuna?
Does Humboldt County have data center rules, and how can I weigh in?
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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