Mountain View regulates pruning of heritage and street trees. Work on protected trees requires a permit and must follow ISA pruning standards.
Under Mountain View City Code Chapter 32 and the Heritage Tree Ordinance, any pruning of a Heritage Tree or a street tree beyond minor clearance requires a permit from the City Arborist and Forestry Division of Public Works. Heritage Trees include native oaks, redwoods, and other specified species once they reach the 48-inch circumference threshold at 54 inches above grade, and many large-canopy non-native species that meet listed diameter benchmarks. Pruning must follow ANSI A300 and International Society of Arboriculture standards; topping is prohibited. Minor clearance pruning for pedestrians, vehicles, or building structures is generally allowed without permit provided less than 25 percent of the canopy is removed in a single year. Work on non-heritage trees on private property is less restricted but must not damage neighbors property.
Contact your local code enforcement office for specific penalty information.
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