Vector/Mosquito Control


The West Valley Mosquito and Vector Control District is a special District that was formed in 1983 in response to the needs of the residents of the West Valley area for the reduction of mosquitoes plaguing the community. In 1985 the District expanded its surveillance and control activities to include flies, rodents, stinging insects, and various other medically important vectors capable of transmitting disease or causing human discomfort. In 1998 the District changed its name from West Valley Vector Control District to West Valley Mosquito and Vector Control District.

District Boundaries

The District's boundaries include the cities of Chino, Chino Hills, Montclair, Ontario, Rancho Cucamonga, Upland, and unincorporated county areas. The District serves over 520,000 residents in 200 square miles of the West Valley.

Governing Board

Governing power is vested in a seven-member Board of Trustees. One member each is appointed by the City Councils of Chino, Chino Hills, Montclair, Ontario, Rancho Cucamonga, and Upland. The San Bernardino County Board of Supervisors appoints one member to represent the unincorporated areas of the District. 

Tips and Guidelines

There is still much to learn about the West Nile virus and how it will continue to affect the residents of Southern California. The West Valley Mosquito and Vector Control District want all residents to follow these guidelines:

  • Drain and dump sources of standing water around their homes
  • Maintain window and door screens in good repair
  • Keep doors shut in the evening, including garages
  • Wear insect repellents when outdoors at dusk and dawn - Remember to read and use repellents in accordance with the instructions
  • Report sources of standing water (green pools, clogged gutters, etc.) and dead birds to the District

Report Dead Birds & Tree Squirrels

Residents can also report dead birds and tree squirrels to the CA Department of Public Health's toll-free hotline, 877-WNV BIRD (877-968-2473) or visit them at the CA Dept. of Public Health website.