The City of Folsom has no data-center use category and no dedicated ordinance. Data centers locate in the M-1, M-2, and M-L industrial districts, permitted by right as assembly or manufacturing inside an enclosed building, or by Planning Commission use permit if classed as a C-3 use.
Folsom's Zoning Code, Municipal Code Title 17, does not name "data center" as a use. A server or computing building is classified into the nearest industrial category and sited in the M-1 Light Industrial (Ch. 17.28), M-2 General Industrial (Ch. 17.30), or M-L Limited Manufacturing (Ch. 17.32) district. As "assembly - light manufacturing" or manufacturing by electric power inside an enclosed building, it is permitted by right, needing only a ministerial building permit. A use classified under the C-3 heavy-commercial list instead needs a Planning Commission use permit under Chapter 17.60, a discretionary approval triggering CEQA review and a public hearing. Folsom has adopted no data-center moratorium or study.
Building or operating a data center outside an industrial district, or without the Planning Commission use permit when the use requires one, is a zoning violation enforced by Community Development through stop-work orders, penalties, and abatement.
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