California unincorporated profile
Outside the boundaries of incorporated cities and towns, the Sacramento County government is the planning and permitting lead agency. That means county zoning, county building codes, and county environmental review apply directly — without a separate city layer. The county rules most likely to catch a project applicant off guard are listed below.
These Sacramento County rules apply directly to projects in unincorporated areas of the county, with no city-level overlay.
Sacramento is one of the highest-flood-risk metros in the country, and the county's floodplain ordinance covers locally designated hazard areas beyond federal flood maps, with a freeboard standard that exceeds the federal minimum.
The corridor along the American River is governed by its own plan with separate requirements, and a portion carries a federal Wild and Scenic designation that prohibits projects interfering with its recreational, water quality, or free-flowing character.
The county's Sacramento-San Joaquin Delta portions fall under oversight from the Delta Protection Commission — an additional approval track on top of county permits for any land use change in the delta zone.
The county protects native oaks above a modest trunk diameter, and replacement is proportional to the removed tree's size — removing a large heritage oak can trigger a significant replanting obligation or an in-lieu payment into the county's tree fund.
The county's southern portions fall under a regional habitat conservation plan that was the first in the nation to bundle both federal wetland and endangered species permits into a single approval — projects there need to coordinate with the plan before ground disturbance.
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Screen an addressSource: Headlands Environmental — environmental site screening for California. Rules summarized from publicly available county codes and planning documents; project review counts indexed from the State Clearinghouse. For authoritative requirements, consult Sacramento County directly.