Buying Land in Colusa County, California

Core Sacramento Valley agricultural country

Colusa County is a small, sparsely populated, and overwhelmingly agricultural county on the west side of the Sacramento Valley, with the county seat of Colusa sitting directly on the Sacramento River. The county's flat valley floor is given over largely to irrigated agriculture, and rice is one of its signature crops -- Colusa County is among the core group of Sacramento Valley counties (alongside neighbors like Glenn and Sutter) that make California one of the largest rice-producing states in the country. Because so much of the county's economy and land use runs through irrigated farming, water rights and irrigation-district membership matter more here, in a very concrete way, than in most California counties.

The Glenn-Colusa Irrigation District (GCID), diverting from the Sacramento River, is one of the largest and oldest irrigation districts in the state and serves a substantial share of Colusa County's (and neighboring Glenn County's) farmland, holding senior water rights that predate much of California's modern water-rights permitting system. See the dedicated farm-land page below for what that means in practice for agricultural land in the district.

The Sacramento River, flood control, and land near the levees

The Sacramento River runs the length of the county, and land near it sits within the long-established Sacramento River Flood Control Project, a system of levees and bypasses developed over more than a century to manage the river's substantial winter and spring flows. Land near the levee system can be subject to floodway or floodplain restrictions distinct from ordinary FEMA flood-zone designations -- confirm both directly with the county and the Central Valley Flood Protection Board for any parcel near the river.

Groundwater under SGMA

Like the rest of California's heavily farmed Central Valley, Colusa County's groundwater basin is subject to the Sustainable Groundwater Management Act (SGMA), which required formation of local Groundwater Sustainability Agencies and adoption of Groundwater Sustainability Plans for high- and medium-priority basins. A well on a Colusa County parcel may be subject to metering, reporting, or pumping allocation requirements tied to the applicable plan -- confirm which Groundwater Sustainability Agency covers a specific parcel, and what it currently requires, directly rather than assuming unrestricted pumping rights.

General zoning and permitting

Outside Colusa County's small incorporated cities (Colusa, Williams), unincorporated land is governed by the Colusa County Planning Department, which handles zoning and building permits, generally within an agricultural-preserve-heavy zoning framework given how much of the county's land is in active farm use. Where public services aren't available, private wells and septic systems are the norm, permitted through the county's environmental health division under California's statewide OWTS framework.