Weed Control

Managing aquatic vegetation is an important and ongoing initiative in the District, to provide efficient water delivery to our users.

Crews work diligently over the spring and summer months, to control unwanted vegetation in and along canals and waterways.

The first application of Magnicide H is usually applied to Canals A, B and C in May in an attempt to curb the early presence of algae and pond weed. Continuing on a bi-weekly schedule throughout the summer months, the treatments wrap up near the end of September. Performed by certified contractors, the spray program has proven successful in hindering the growth of harmful and nuisance plants and prevents shutdowns of plugged irrigation systems.

Employees also regularly mow canal banks, clean ditches and cut cattails during the water season.

Tackling Aquatic Invasive Species

The WID actively watches canals, reservoirs and irrigation infrastructure for aquatic invasive species that impact and post threats to the quality and delivery of water. Flowering rush, Prussian carp, zebra and quagga mussels, Chinese mystery snails, and Northern crayfish are several invasive species we monitor. Strategic multifarious efforts – prevention, removal, water testing, education, and awareness – are essential in addressing the issue.


As in previous years, the Western Irrigation District is permitted to implement an herbicide spray program, under specific conditions, in or within 30 horizontal meters of irrigation canals, laterals and drains owned by the District to attempt to control:

  • Broadleaf weeds and brush
  • Aquatic and semi-aquatic vegetation
  • Noxious weeds
In accordance with the Environmental Protection & Enhancement Act, application was made by the District and approval received to proceed with this annual program to apply herbicides.

Persons having specific concerns are encouraged to contact the WID office.


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