Mosquitoes can also be reduced by removing manmade breeding grounds such as tires, buckets, and clogged gutters that hold standing water. Water in birdbaths, fountains, and other water features should be changed at least twice a week. Also, fix leaky faucets to reduce water from ponding near your home.
Washington State DOH - West Nile Virus
Washington State DOH - Mosquitos
Island County Mosquito Survey Report