Mosquito Control

Notice: All Environmental Health services are now temporarily located at 133 SE Second Avenue in Hillsboro. As you turn the corner from Main Street and pass Edward Jones, please use the second building entrance located at 133 SE Second Avenue. It's the same entrance as the gym/fitness center. You cannot get to the offices if you enter the building on Main Street or the first entrance on Second.

Washington County Mosquito Control is responsible for managing mosquitoes by an integrated mosquito management (IMM)strategy. Integrated Mosquito Management is a comprehensive mosquito surveillance and control strategy that utilizes available mosquito control methods singly or in combination to reduce their numbers to tolerable levels while maintaining a quality environment.

Key elements to the mosquito control program:

  • Provide public education and outreach in the community
  • Conduct mosquito surveillance using a variety of field and laboratory methods to monitor mosquito populations and mosquito-borne diseases
  • Use biological and/or chemical control methods when conditions supporting mosquito production cannot be removed or altered sufficiently
  • Distribute mosquito fish to Washington County residents for use in their ornamental ponds, water troughs and other potential breeding areas
  • Coordinate surveillance and control efforts with other local, state and federal governmental agencies

How do I...

Environmental Health: 503-846-8722

Mosquito Control: 503-846-2904