The Forestry Division is responsible for the planting and maintenance of all city trees located in public right-of-ways referred to as street trees. They also are responsible for all the trees in the parks.

Please learn more about our street tree program and Arborist, Aaron Lehnert!

Emerald Ash Borer

The Emerald Ash Borer has been confirmed in Waukesha (PDF). If you suspect Emerald Ash Borer on your property, contact 800-462-2803, email the UW-Extension Horticulture Office, or call them at 262-548-7779.

Additional Information

Emerald Ash Borer

Tree Survival Guide Tips

Try these helpful hints for maintaining tree health and find out more in our Tree Survival Guide (PDF).

  • Set a garden hose at a slow trickle moving the hose around the base of the tree for 15 minute increments in at least 4 different locations (about an hour duration). A watering of once per week should be adequate.
  • Spread mulch near trees. It helps prevent evaporation from the soil and prevents water from running when the ground is hard.
  • Pay particular attention to trees on boulevards near construction zones. Road work can stress a tree.
  • Bigger trees in yards also suffer from stress. Water a larger tree with a sprinkler. Set out a coffee can near the tree. When the can has an inch of water in it, turn off the sprinkler. A watering of once per week is adequate.