Mosquito Control Program

Delta has a mosquito control program in place to reduce the annoyance of mosquitoes in the community, which includes the application of a biological larvicide in known mosquito breeding areas. This biological agent targets only insects and has no effect on humans, birds, or aquatic animals.

Mosquitoes are prevalent during the summer months, especially around areas with standing water, but there are things that can be done to manage the mosquito population. To help control mosquito breeding areas on your property and reduce your exposure to mosquitoes, follow the 4 Ds:


  • Standing water is a breeding magnet for mosquitoes; even a filled planter container will attract them. Remove or modify as many outdoor sources of standing water on your property as possible:
    • Drain or remove plastic sheets that have accumulated water, including inflatable wading pools.
    • Remove or punch a hole at the bottom of old tires.
    • Drain unused ornamental water features (e.g. fountains), or aerate. Drain and refill bird baths twice a week.
    • Discard any unused water holding items, such as empty cans, containers, or pots.
    • Store wheelbarrows, watering cans or other useful potential water holding items upside down.
    • Clean out clogged gutters.
    • Maintain actively used swimming pools with proper levels of free chlorine; drain any unused and unchlorinated pools.


Wear long sleeved pants and shirts, socks and shoes, especially during periods when mosquito activity is highest. Light coloured clothing is less attractive to mosquitoes. Tightly woven clothing is better at resisting puncturing by mosquitoes.


In general, mosquitoes are most active during these periods. Avoid outdoor activities during these times unless other forms of protection are being utilized. Maintain door and window screens to ensure they are in good condition; self-closing screen doors may be helpful.


DEET (N, N-Diethyl-meta-toluamide) is an insect repellant approved by Health Canada that is effective at deterring mosquitoes and other biting insects. Other approved insect repellents are icaridin, and lemon-eucalyptus oil. Repellents should be applied as per the directions on the bottle. For more information on insect repellents, visit the BC Centre of Disease Control's website.

For more information on general mosquito control, visit Health Canada's website

For more information on Delta's Mosquito Control Program and to report areas of concern please contact Delta's Office of Climate Action and Environment at or 604-946-3253.

Integrated Pest Management Plan

Delta is currently in the process of renewing its five-year Integrated Pest Management Plan for mosquito control. Public comments on the draft plan can be submitted to  The Plan aims to reduce overall mosquito annoyance by controlling larval development using an Integrated Pest Management approach. The Plan focuses on larval mosquito control initiatives and uses public education, physical site modification and biological controls to reduce larval mosquito populations. The Plan also works to conserve natural mosquito predators and includes the use of non-persistent pesticides that are “natural” and non-toxic to other organisms. 

Further Details


The purpose of this Pest Management Plan (PMP) No. 700-0004-2016/2021 is to reduce overall mosquito annoyance within Delta by controlling larval development using an Integrated Pest Management (IPM) approach to control. The PMP focuses on larval mosquito control initiatives and uses public education, physical site modification and biological controls to reduce larval mosquito populations and conserve, or enhance, natural mosquito predators wherever possible and includes the use of non-persistent, bacterial larvicides.

The proposed duration of the PMP is from 15 April 2016 to 14 April 2021.  Larvicide products proposed for use include Vectobac 200G, which contains the natural-occurring soil bacterium Bacillus thuringiensis var. israelensis, (PCP #18158) and VectoLex CG (PCP # 28008) and VectoLex WSP (PCP # 28009) made with the related bacterium Bacillus sphaericus.   These products provide species-specific control of mosquito larvae and are non-toxic to other organisms including insects, fish, birds, wildlife, man and domestic animals. 

Mosquito larvae require stagnant or non-flowing waters, temporary or permanent, to develop. Development habitats include salt marshes and freshwater marshes, ponds, ditches and catch basins and other open water habitats which may produce larval mosquitos. When physical alterations (draining, filling) are neither practical or desirable, developing larvae will be treated using VectoBac 200G or VectoLex larvicides. Total area for larvicide treatment is not to exceed 50 hectares of public lands in each year of the PMP. Applications of Vectobac and VectoLex will be made using ground-based, hand-broadcast or motorized backpack spreader methods. All applications will be conducted within Delta.  

This Pest Management Plan is being prepared for Delta by D.G. Regan and Associates Ltd., an environmental services firm with extensive experience in pest management plan development and local mosquito control operations. Information on proposed treatment areas, annual mosquito control program operations and this PMP are available for viewing by the public on Delta’s website at or by request to Office of Climate Action and Environment, The City of Delta 4500 Clarence Taylor Crescent, Delta BC. V4K 3E2 or  For VectoBac or Vectolex product information please see the manufacturer’s website

A person wishing to contribute information regarding a proposed treatment site, relevant to the development of this Pest Management Plan, may send copies of the information Delta’s Office of Climate Action and Environment  at the contact addresses above within 30 days of the publication of this notice.   The identity of any respondents and the contents of anything submitted in response to this notice and application will become part of the public record. 

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