TSW Water Soldier Herbicide Control 2023

This project does not require posting on the IAA Registry as it is not a physical activity in relation to a physical work and therefore does not meet the definition of a project pursuant to the IAA. However, in accordance with PCA policy, physical activities of this nature require an Environmental Impact Assessment. With this, this project shall be assessed via a Basic Impact Assessment (BIA).

Parks Canada Agency (PCA), Ontario Waterways (ONW) is managing the spread of the aquatic invasive species Water Soldier (Stratiotes aloides) on the Trent-Severn Waterway (TSW). Water Soldier populations occur in the lower Trent River. This project will support work to control WS through herbicide control for 2023 in the TSW. Water soldier colonies reported during the 2022 summer field investigations on the TSW shall be targeted in the fall months (mid-September to mid-October) of 2023 with Reward® aquatic herbicide. The treatment area is approximately 160 hectares.

Latest update

July 12, 2023 – The public comment period on the project is closed. Parks Canada is considering comments received to help inform its determination on whether the carrying out of the project is likely to cause significant adverse environmental effects.


Key documents

Key documents
Document Number Document Title File Date
1 New Project Being Assessed by Parks Canada - Public Comments Invited From June 12 to July 12, 2023 - August 19, 2020


Trent-Severn Waterway National Historic Site
P.O. Box 567
Peterborough, Ontario K9J 6Z6
Telephone: 705-750-4900 or 1-888-773-8888
Email: trentsevern@pc.gc.ca

  • Location

    • Trent-Severn Waterway National Historic Site (Ontario)
  • Nature of Activity

    • Other, not otherwise specified
  • Assessment Status

    In progress
  • Start Date

  • Proponent

    Parks Canada
  • Authorities

    • Parks Canada Agency
  • Assessment Type

    Project on federal lands
  • Reference Number


This map is for illustrative purposes. The markers represent the approximate locations based on available data. More than one marker may be identified for a given assessment.


Nearby assessments

...within 200 kilometres
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