Township of Severn is dedicated to protecting our environment and combatting the effects of climate change. Learn about source water protection, how we protect and monitor our drinking water, and ways you can help with water conservation in our community.

Severn Sound Environmental Association

The Severn Sound Environmental Association (SSEA) engages with our community to protect Severn Sound and its watershed. While monitoring the waters of the Sound and its tributaries, they work to prevent pollution through educational and stewardship-based initiatives. Explore SSEA's programs and projects to find a way that you can volunteer, get involved and help our environment.

Sustainable Severn Sound

Sustainable Severn Sound (SSS) is a special SSEA project that works to apply sustainability principles and awareness with the Township of Severn and local partner municipalities in Severn Sound area. Sustainable Severn Sound has developed the area’s Local Climate Change Action Plan (LCCAP), which educates communities and municipalities on climate change, how we can reduce greenhouse gas emissions, fossil fuels use and energy consumption, as well as how we can adapt to our changing climate.


We don't regulate the location of trees on private property. If you have a complaint about a neighbour's tree, hedge or bushing being too close to your property, this is considered a civil matter and we won't get involved. This also applies to trimming overhanging branches from another private property. For dead or dangerous trees on your property, please contact an arborist.

When a tree trunk is located exactly over the property line and the tree technically belongs to both residents, it's regulated by the Ontario Forestry Act. For more information, contact Service Ontario.

Tree seedling distribution

If you're a private landowner in the Severn Sound area, the SSEA has launched a Tree Seedling Distribution Program to help you plant native trees and shrubs to improve our environmental health. They also provide great tree planting tips, a species selection guide, and more.

Giant hogweed

Giant hogweed is a noxious and invasive plant that can be toxic to people and pets who come into contact with it. View SSEA's video to learn how to identify it.

If you spot giant hogweed in the Severn Sound area, please report it to SSEA with a location and photos. Don't touch any part of this plant as it can cause burns and skin irritation.

LDD moth

The LDD moth (Lymantria dispar dispar) is an invasive insect native to Europe. This pest feeds on a wide variety of trees.

View resources by the Province of Ontario and SSEA to learn about the LDD moth life cycle and how to protect trees on your property from infestation.

Read more about the LDD moth

West Nile Virus

West Nile Virus is a mosquito-borne virus that can cause illness. This virus can be spread to humans by the bite of an infected mosquito. For more information regarding West Nile Virus, visit the Simcoe Muskoka District Health Unit.

Larvicide program

At the direction of the Local Medical Officer of Health, we offer a Larvicide Program to control larval mosquitoes in order to prevent West Nile Virus. Under this program, licensed technicians will place larvicide into all municipally-owned catch basins or storm drains within the boundaries of Severn.

Blue-green algae

Blue-green algae (cyanobacteria) are microscopic organisms that are naturally present in lakes and streams. They are usually present in low numbers but can rapidly increase in warm, shallow, undisturbed surface water that gets a lot of sun. When this happens, they can form blooms that can make the water look blue-green or olive-green and may produce floating scum on the surface of the water.

Some blue-green algae produce toxins that can pose a health risk to people and animals when they are exposed to them in large amounts.

For more information regarding blue-green algae, please visit the Simcoe Muskoka District Health Unit.