Town of Islip Department of Public Works manages street trees within the right-of-way. Property owners may not prune or top street trees without a permit; private-property trees may be trimmed freely subject to species protections in preservation zones.
Islip Town Code Chapter 68 (Trees) establishes street-tree protection. Permits are free but require DPW arborist review before pruning above 25 percent of the canopy. Utility pruning by PSEG Long Island follows ANSI A300 standards and prior-notice rules. Private-property trees are generally unregulated unless in a designated preservation overlay or Pine Barrens CGA. Dead or hazardous limbs over rights-of-way must be removed by the adjacent owner.
Unpermitted street-tree pruning: $250-$1,000 plus tree-replacement cost. Damage to landmark trees: up to $5,000 plus restitution.
Islip, NY
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