Forestry and Vegetation

Arborist safely trimming a tree from a bucket

Tree Trimming and Vegetation Management

In 2021, Waterloo North Hydro (WNH) is trimming trees in the following areas:

  • Woolwich North (Completion Date: March 31, 2022)
  • Waterloo West (Completion Date: March 31, 2022) 

WNH maintains and trims trees located near utility-owned power lines. We maintain and trim trees every 2 to 5 years. As part of our services, we clean up and remove the trees, branches and debris.

Below is our tree trimming schedule from 2021-2025. These areas will be visited to trim trees that could contact power lines causing an electrical system supply interruption.

Please be advised that for public safety and system supply reliability, Waterloo North Hydro has contracted a qualified contractor to remove the limbs or trees around our electrical lines.

If you require emergency tree trimming, please complete our Forestry Service Call Request Form or call our Operations department at 519-888-5577.


Tree Trimming Schedule: 2021-2025

Tree Trimming Schedule - Click on the images below to enlarge the maps

Woolwich North Tree Trimming 

Waterloo West Tree Trimming Map

 Tree trimming map for Wellesley West

Waterloo East Tree trimming map

 A map of the impacted tree trimming area




Waterloo West Tree Trimming Map

 Tree Trimming Map - Woolwich South

 Waterloo East Tree trimming map

Woolwich North

Waterloo West

Wellesley West

Waterloo East/Elmira

Wellesley and Woolwich South

Waterloo West

Woolwich South

Waterloo East/Elmira

Why Complete Regular Tree Trimming and Vegetation Management?

We believe in reducing our impact on the environment and attempt to avoid trimming and removing trees whenever possible; however, trees can affect our ability to provide safe and reliable electricity. Sometimes we have to trim or remove trees that are too close to powerlines.

Tree trimming is an essential component of WNH's operational and safety activities and WNH maintains and trims trees located near utility-owned power lines on a cycle of every two to five years. Clearing branches away from overhead powerlines greatly reduces the risk of power interruptions caused by branches or vegetation contacting powerlines.

Vegetation management is an important tool in lowering the risk of electrical fires and electrical shocks caused by trees and branches.

Who is Completing Tree Trimming For Waterloo North Hydro?

Logo for Ontario Line Clearing and Tree ExpertsOntario Line Clearing & Tree Experts has been contracted by WNH to complete vegetation management for WNH.

For more information on Ontario Line Clearing & Tree Experts, please visit


How Will I Know When My Neighbourhood is Scheduled for Tree Trimming?

Please refer to the Tree Trimming Schedule to determine which year your neighbourhood is scheduled for Tree Trimming. If WNH's vegetation management contractor is planning to work in your neighbourhood,  a notice will be delivered to your property alerting you that work will be starting shortly.

If you have any questions regarding the Tree Trimming Schedule, please email or call us at 519-888-5577.

Unplanned Tree Trimming Services

Sometimes strong winds or storms damage trees near overhead power lines. If you need Waterloo North Hydro to trim or remove a tree that is hazardous to an overhead power line, complete the Forestry Service Call Request Form or call our Operations department at 519-888-5577.

Once the form is complete, we will arrange to see the affected tree(s) and recommend the type of work required. It is the responsibility of the tree owner to clean up and dispose of any branches or debris.

Safety and Maintenance Around Your Property

If you have an overhead powerline on your property, you may own the assets. You are legally responsible to maintain the electrical equipment on your property – such as poles and overhead wires – in a safe manner and in compliance with the Ontario Electrical Safety Code.

This includes safely maintaining tree growth and plant material around overhead powerlines to avoid potential electrical hazards. If you’re not sure how to determine ownership of the powerlines and related equipment, contact your Local Distribution Company for more information.

Please review the Privately-Owned Powerline Assets handout to better understand your responsibilities as a property owner.

Safety Tips: Planting Near and Around Transformers

To maintain the reliability, integrity and efficiency of the distribution system, Waterloo North Hydro has the right to have unobstructed access to electrical distribution equipment, including but not limited to padmount transformers and switchgear, on private and public property at all times for inspection, repairs and maintenance.

If you are considering planting shrubbery around a pad-mounted transformer (the rectangular green boxes located near property lines), please note the need to keep as much open space as possible so hydro crews can access the transformer for maintenance and repairs. Property owners are encouraged not to plant any vegetation other than turf grasses within 3.65 metres of the opening side of the box (where the padlock is located.) as a clearance of 3 metres is required at all times on this side of the transformer.  Labels are placed on all padmount transformers clearly illustrate the working clearances required around the equipment.

If there is a transformer on or near your property line, please note the following safety tips:

  • Always call Ontario One Call at least 7 business days before you plan to dig at 1-800-400-2255 or visit them on the web at One of their representatives will come out to locate and identify existing buried conductors around the transformer.
  • Keep all shrubs, fences and other permanent structures at least 3 metres from the front and 1 metre from the back and sides of the transformer.
  • Don't plant trees near pad-mounted transformers! A tree's large root system could lift the concrete pad and potentially create a power outage.
  • Select plants that are slow-growing and easy to maintain. Avoid using plants with thorns, such as barberry, blackberry, hawthorn, or roses.
  • Location numbers and/or company locks must be visible at all times.
  • Don't allow plants to overgrow the transformer. Valuable equipment can overheat and become damaged, possibly causing a power interruption.
  • Don't plant vines or ivy, which can attach to and potentially damage the transformer.
  • Don't place dirt, wood chips or snow against any portion of the transformer - this could also cause it to overheat and/or rust prematurely.
  • Don't change grade levels around the pad-mounted transformer for a distance of 1.8 metres out from the cement base of the transformer.

For more information and guidelines visit the Electrical Safety Authority website.