Mendocino County has no ordinance specific to cryptocurrency or blockchain mining. A commercial mining operation is treated as a data center or general industrial use, allowed in the I-1 or I-2 industrial districts and bound by the same Major Use Permit, CEQA review, and Chapter 8.100 noise limits.
Unincorporated Mendocino 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 a general industrial use in the I-1 (Chapter 20.096) or I-2 (Chapter 20.100) district, with a Major Use Permit and CEQA review for a utility-scale facility. Its cooling and any on-site generators must meet the nighttime noise limits of Chapter 8.100 — 60 dBA continuous and 75 dBA intermittent at an adjacent 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 I-1 or I-2 district, without required permits, or exceeding the Chapter 8.100 noise limits faces county zoning and noise enforcement and denial of permits until it conforms.
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