Colusa County has no dedicated data-center ordinance. In unincorporated areas a server facility is an industrial use, permitted by right in the M-1, M-2, and Research and Development (RD) zones and subject to CEQA and industrial performance standards. Colusa and Williams set their own zoning.
Rural Colusa County does not name data centers in its Zoning Code (Chapter 44, Ord. No. 765). A data center is unlisted, so under Section 44-0.10 the Community Development Director classifies it by analogy, most closely as Research and Development or light manufacturing, both permitted by right in the M-1, M-2, and RD zones; a power-heavy campus resembling Utilities, Major needs a Use Permit. Table 44-2.50-1 sets a 0.6 floor-area ratio and a 15-to-30-foot front setback. Section 44-2.50.20 performance standards cap noise, traffic, water, and air-quality impacts; a project that cannot meet them is elevated to a minor use permit or use permit, triggering CEQA. The code governs unincorporated land only.
Building a data center outside the M-1, M-2, or RD zones, or without a required use permit or CEQA clearance, is a zoning violation. The county can withhold building permits, issue stop-work orders, and require rezoning or permitting first.
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See how Colusa County's data center zoning & siting rules stack up against other locations.
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