Skamania County Mosquito Control District

Skamania County Mosquito Control District

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Servicing Skamania County through mosquito surveillance and control

Our team works to protect the comfort and health of our community by monitoring mosquito populations and reducing breeding habitats throughout the county.

Prevent Mosquito Breeding: Essential Tips for Outdoor Items

August 20, 2025


After last week’s rain and with the return of hot weather, please take a few minutes to empty any containers holding water. Be sure to check planters, buckets, tarps, tires, and other outdoor items. Even small amounts of standing water can quickly become a mosquito breeding site, producing large numbers of larvae.

Special Reminder for Kayak Owners
Any water left inside a kayak has a high likelihood of becoming a mosquito breeding ground, producing hundreds of larvae in just days. To protect yourself, your family, and your neighbors, dump out all water from your kayak regularly. A few minutes of prevention helps keep our community more comfortable and mosquito-free.

Preparing Your Yard for Mosquito Season

April 7, 2025

Many mosquito problems in your neighborhood are likely to come from water-filled containers that you, the resident, can help to eliminate. All mosquitoes require water in which to breed. Be sure to drain any standing water around your house.

  • Dispose of any tires.
  • Tires can breed thousands of mosquitoes.
  • Drill holes in the bottom of recycling containers.
  • Clear roof gutters of debris.
  • Clean pet water dishes regularly.
  • Check and empty children’s toys.
  • Repair leaky outdoor faucets.
  • Change the water in bird baths at least once a week.
  • Canoes and other boats should be turned over.
  • Avoid water collecting on pool covers.
  • Empty water collected in tarps around the yard or on woodpiles.
  • Plug tree holes.
  • Even the smallest containers can collect water and breed hundreds to thousands of mosquitoes. They don’t need much water to lay their eggs. (bottles, barrels, buckets, overturned garbage can lid, etc.)

April Board Meeting Date Change

March 7, 2025

Board Meeting Date Change
The April board meeting has been rescheduled from April 2, 2025, to April 9, 2025. The meeting will still be held at 214 CBD Mall Dr., North Bonneville, WA 98639, at 5:45 PM.

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Public Notice of Mosquito Control Activities

March 5, 2025

The Skamania County Mosquito Control District will begin seasonal activities around March 24, 2025. We will use one of the following larvicides only when mosquito larvae are found.

  1. VectoMax WSP (Bacillus Sphaericus, Bacillus Thuringiensis Israelensis): specific for mosquito larva
  2. VectoBac G (Bacillus thuringiensis subsp. israelensis (strain AM65-52) specific for mosquito larvae.
  3. Vectomax FG (Bacillus Sphaericus, Bacillus Thuringiensis, (subsp) israelensis
  4. MetaLarv XRP (s) Methoprene
  5. Natular G30 WSP (Spinosad (a mixture of spinosyn A and spinosyn D)
  1. Altosid Pellets WSP (S-Methoprene) a growth inhibitor active on early stages of mosquito larva
  2. Agnique (poly-alpha –w-hydroxy): a monomolecular surface film used for later stages of larva and pupa

Later in the season and only in those areas where adult mosquitoes reach thresholds as specified in the District’s IMM plan or if mosquito-transmitted disease is detected, will the district adulticide using:

  1. Permasease 4-4 – fogged at a rate between 0.001 and 0.007 pounds per acre
  2. Biomist 4+4 – fogged at a rate 0.00175-0.007 pounds per acre

Depending on weather conditions, mosquito control activities will continue throughout the season until mid to late October.

Phone or email the Mosquito Control District for further information or to report mosquito problems within the district boundaries – (360) 904-4345 or bwilliams@scmcd.org.  Additional information and schedule changes will be posted and updated on our website https://scmcd.org

You may also contact the Dept. of Ecology, Water Quality Program, Attn: Aquatic Pesticide Permit Manager, P.O. Box 47696, Olympia, WA 98504

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