San Mateo County has no ordinance specific to cryptocurrency or blockchain mining. A commercial mining operation is treated as a data center or industrial use, needing a use permit under the Development Code, CEQA review, and compliance with the Chapter 4.88 noise limits.
Unincorporated San Mateo County does not single out cryptocurrency or bitcoin mining in its code. A commercial mining operation, being a room of servers and cooling equipment, is regulated the same as any data center: it would require a discretionary use permit under Development Code Section 8.280.010, CEQA review, and, on the coast side, a Coastal Development Permit. Its cooling and any on-site generators must meet the Chapter 4.88 exterior noise standards, including the 5 dBA reduction for tonal noise. Given the county's limited industrial land, such an operation is far likelier to locate in an incorporated city. Small-scale hobby mining on personal equipment inside a home is governed by ordinary residential and home-occupation rules.
No crypto-specific penalty exists. A commercial mining facility on unincorporated land without a use permit, CEQA clearance, or a required Coastal Development Permit, or exceeding the Chapter 4.88 noise limits, faces county enforcement and denial of permits until it conforms.
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