The most cost effective and efficient method of controlling mosquito populations is through larval control. Larval control is preventing mosquito larvae from becoming adult mosquitoes. The District focuses a majority of its mosquito abatement resources into public education, identification, and control of local aquatic habitats.
The District, the Public Health Department, and the Board of Supervisors have carefully weighed the risks and benefits of adult mosquito control treatments. The Federal and California Environmental Protection Agencies, scientific literature, decades of Ultra Low Volume (ULV) treatments used across the country, and treatment operations in Santa Clara County since 2005 all attest to the safety and effectiveness of ULV treatments.
The District uses truck-mounted equipment that travel down the street releasing a very fine mist of the treatment product. The District ensures that its equipment is delivering the proper droplet size by using a process called calibration, and the output of the truck-mounted treatment equipment is regulated by radar signals detecting the speed of the truck.