Humboldt County has no ordinance specific to cryptocurrency mining. A commercial mining operation is treated as a data center or industrial use, sited in an ML, MG, or MH zone with a Use Permit and CEQA review, and bound by the same General Plan noise standards.
Unincorporated Humboldt County does not single out cryptocurrency or bitcoin mining in its code. Because a mining operation is a room of servers and cooling equipment, it is regulated like any data center: sited as an industrial use in the ML, MG, or MH districts, requiring a discretionary Use Permit and CEQA review, plus a Coastal Development Permit anywhere in the Coastal Zone. Its cooling and any on-site generators must meet the General Plan Noise Element short-term standards — 65 dBA day and 60 dBA night at a neighboring residential property line. Small-scale hobby mining on personal equipment inside a home falls under ordinary residential and home-occupation rules, not industrial zoning.
No crypto-specific penalty exists. A commercial mining facility built outside an industrial zone, without required permits, or exceeding the General Plan noise standards faces county zoning and noise enforcement and denial of permits until it conforms.
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