Unincorporated Colusa County has no general ordinance dictating how or when private trees must be trimmed. Trimming is governed by sight-distance rules at intersections (Chapter 12D), firebreak/defensible-space requirements (Chapter 7 and state PRC 4291), and encroachment rules for vegetation overhanging county roads (Chapter 29). Routine pruning of trees on your own land needs no county permit.
Colusa County does not regulate ornamental tree pruning on private property, so homeowners may trim their own trees freely. Several code provisions do, however, require maintaining vegetation in specific situations. Chapter 12D (Sight Distance Obstructions) limits hedges, shrubs, and tree foliage that obstruct visibility at intersections. Chapter 29 (Encroachments) governs trees and limbs that overhang or encroach into county road rights-of-way, which the Department of Public Works can require to be cut back. Chapter 7 (Fire Prevention) requires firebreaks and clearance around buildings, and the zoning code's landscaping section (44-3.10.020.F) cross-references the state defensible-space mandate in Public Resources Code Section 4291, which requires clearing flammable vegetation and trimming tree limbs near structures in fire-prone areas. There is no county heritage-tree or street-tree trimming permit for the unincorporated area. Within the cities of Colusa and Williams, municipal tree and right-of-way rules apply instead of the county's.
Vegetation obstructing intersection sight lines or encroaching on county roads can be declared a nuisance and ordered abated under Chapters 12D and 29, with enforcement through the county's code-compliance and nuisance-abatement process (Chapter 42). Failure to maintain required firebreaks or defensible space can trigger abatement and cost recovery.
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