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Home > Health Topics > West Nile Virus > Check Out Your House

Check Out Your House

Mosquitoes can breed in any puddle or standing water that lasts more than four days. Even a tablespoon of standing water can become breeding grounds for mosquitoes.

To protect against West Nile virus and other mosquito-borne diseases, eliminate any still body of water in your yard or treat it with mosquito growth regulators available at local hardware or nursery stores.

Dump and drain all water-holding containers such as:
  • Flowerpots
  • Buckets
  • Discarded tires
  • Gutters
  • Tree holes
  • Any other vessels that can hold water

Check your home for any of these possible mosquito sources:

Change water in birdbaths once or twice per week.

Ornamental ponds should be aerated and stocked with mosquitofish (Gambusia affinis).

Fix any holes in screens and make sure they are tightly attached to the doors and windows.

Free mosquitofish can be picked up at Contra Costa Mosquito and Vector Control District, 155 Mason Circle in Concord. For directions, call 925-685-9301.

Content provided by the Public Health Division of Contra Costa Health Services.

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