Mosquito Control District

May 23, 2022 Treatment locations

May 24, 2022 Treatment locations

2022 treatment locations

MCD Treatment 05172022A
MCD Treatment 05172022B


Abatement and operations 

The Clark County mosquito crew conducts surveillance and abatement activities through the active mosquito season, usually April 1 through October 1, each year. The priority is to attack mosquitoes at their source, by treating mosquito larvae as they hatch. It is far more effective to reduce mosquito populations at their source, before they fly into neighborhoods, than to fog large, open areas in attempt to eliminate adult mosquitoes. It is very difficult to reduce mosquito populations once they have spread from the breeding source.

Control measures used by the crew comply with policies adopted by the Board of Trustees of the Mosquito Control District and with state and Environmental Protection Agency regulations. Biological control methods are used that have the least adverse effect on humans, pets, wildlife, and the environment.

The crew implements an Integrated Pest Management (IPM) program and uses a variety of products and equipment to control mosquitoes. Treatment methods in Clark County include larvicide applied by helicopters, broadcast from trucks, all-terrain vehicles, amphibious vehicles, and on foot from backpack applicators. Larvicide briquettes are placed into storm drains and catch basins. Limited treatment is applied to adult mosquitoes due to the limited effectiveness of this method and the short duration of the materials. Due to legal restrictions, the Mosquito Control District cannot spray or fog neighborhoods or private residences.

Service request

The Clark County mosquito control crew works April 1 through October 1 each year. During that time requests for service or information regarding mosquito control can be made through either the 24-hour service request line at 360.574.7906 or on-line service request.

When reporting an area of standing water, please provide the following information:

  • Your first and last name (please speak clearly and slowly, and spell your last name).
  • Your address, including city and zip code.
  • Your telephone number.
  • Description and location of the problem.

A mosquito crew will visit the problem area and determine treatment or monitoring needs. You will receive a phone call only if additional information is needed to find the problem site.

Job Openings for 2022

The District is seeking seasonal Vector Control Field Technicians to assist in mosquito and vector surveillance and control as part of the Clark County Mosquito Control District. Our District is based in Vancouver, WA and serves all of Clark County. Click on the posting below for more information:

Planned Treatments

No upcoming treatments planned.


Clark County Mosquito Control District, as an essential service, is still serving the community by treating for mosquitoes and responding to mosquito control service requests. The health and safety of the citizens we serve and of our employees is paramount during the COVID-19 pandemic. To protect everyone, we have implemented the following measures to promote social distancing and to adhere to Center for Disease Control and Prevention (CDC) recommendations and state guidance:

  • Increased cleaning of surfaces at the shop
  • Increased cleaning of trucks and equipment
  • Vehicles assigned to individual employees
  • Reusing existing personal protective equipment to preserve available supply
  • Staying home when sick.

To protect everyone and adhere to social distancing guidelines, please stay at least 6 feet away from Mosquito Control employees treating for mosquitoes.

Mosquitoes do not spread coronavirus

The CDC reports that:

  • Not all types of viruses can be spread by mosquitoes and ticks. ​
  • At this time, we have no data to suggest that COVID-19 or other similar coronaviruses (e.g. SARS, MERS) are spread by mosquitoes or ticks. 

Public Health and the Mosquito Control District work together to control mosquitos in Clark County. District activities are guided by the work plan adopted by the Mosquito Control Board of Trustees to address mosquito nuisance abatement and threats of West Nile Virus.