Tree Maintenance

Hydro line clearing program

Starting in January 2019, the Town of Oakville and its tree service contractor will perform hydro line clearing in south west Oakville (Area 1).

Search the progress of the tree pruning with our interactive map.

Each year, the town and its tree service contractor perform hydro line clearing on behalf of Oakville Hydro to reduce safety hazards and power outages, while maintaining the health, safety and well-being of the town’s tree canopy. If not properly maintained, trees can create power outages or hazardous situations by touching or even falling on hydro lines. In rare instances, trees growing too close to the hydro line will be removed as a last resort if the arborist cannot balance the clearance standard with acceptable pruning standards.

Trees are pruned on a four-year cycle following the Electrical Safety Authority’s (ESA) industry standard of providing a minimum three-metre (10 foot) clearance between branches and primary power lines and one metre (three feet) for secondary lines. Our professional arborist contractors prune trees with these goals in mind:

  • Keep the structural integrity of the tree intact
  • Maintain the health of the tree with well-placed cuts that heal well and minimize sprouting
  • Promote regrowth away from hydro lines through directional pruning
  • Leave branches growing down and away from wires to continue their growth

In some instances, the town must prune privately owned trees if they have grown too close to the hydro line. When hydro lines are located in rear yards, Oakville Hydro has an easement through the property which allows the arborist to access the tree.

Learn more about tree pruning around hydro lines and how you can help maintain your trees.


The town held an open house on January 15 where staff from the town’s Forestry section and Oakville Hydro were on hand to share information and answer questions. If you were not able to attend the open house and have questions about hydro line clearing, please contact ServiceOakville at 905-845-6601, TTY 905-338-4200 or

2018 hydro line clearing map

2018 hydro line clearing map