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Urban Forestry


Trees are an integral part of Onalaska's character, history, and infrastructure. The City maintains over 7,000 publicly-owned trees and plants more every year. The City is committed to protect this resource through education, tree preservation, routine maintenance and planting, design standards, enforcement and teamwork.


The benefits of trees are numerous. Some of which include:
  • Increased property values
  • Enhanced scenic beauty
  • Air pollutant uptake
  • Cooling and heating savings
  • Lower summertime temperatures
  • Storm Water retention

Information about Tree Diseases & Pests

The Wisconsin DNR provides more information about threats to tree species in our region. According to the DNR, Emerald Ash Borer was first found in Wisconsin in 2008. Since then, the City has replaced 98% of City ash trees with a variety of other species. The rest are being monitored and/or treated.

Emerald Ash Borer

Oak Wilt

If you suspect a tree on your property is diseased, here is a list of Certified Commercial Arborists.

If you suspect a City-owned tree is diseased, please fill out this form.