How We Protect You From Vectors

The San Gabriel Valley Mosquito and Vector Control District is a public health agency that is committed to providing ongoing vector control for residents of cities that are members of the District. We incorporate an integrated vector management (IVM) program comprised of several key elements to protect public health.

Disease Surveillance – Staff conducts surveillance using a variety of field and laboratory techniques to monitor vector-borne diseases and populations of vectors such as mosquitoes, black flies, and midges. Vector Ecologists test for the presence of arboviruses such as West Nile virus (WNV), Zika, St. Louis encephalitis (SLE), and Western equine encephalitis (WEE). 

Source Reduction – Our Operations department is the driving force behind managing vectors. All vectors require specific conditions to reproduce and proliferate. The most effective way to manage populations of vectors is to disrupt their life cycle by removing or altering elements in the environment which they require to survive. For example, mosquitoes require standing water to complete their life cycle. By removing sources of standing water, mosquito populations may be reduced or eliminated. Vector Control Specialists inspect properties and public spaces for sources of water that may support vectors.  These sources, whenever possible are removed.

Control - When conditions that support vectors cannot be removed or altered sufficiently it may be necessary to use biological and/or chemical control. Biological control involves using natural predators to manage the population of vectors. Mosquito fish are a well-established natural predator of mosquito larvae that our District uses in places such as fish ponds, ornamental ponds, and water troughs. Chemical control involves the use of target specific pesticides to reduce vector populations and are used against vectors as a last resort. The District nearly always uses pesticides that target the immature stages of vectors. These larvicides are highly selective, environmentally benign and have little to no effect on non-target organisms. Occasionally, it may be necessary to use adulticides (pesticide that targets the adult stage) if adult vectors are present that are infected with a pathogen which is a threat to public health. 

Public Education - Providing our residents with information is the most important aspect of vector control activities. We provide information on vectors, vector-borne disease, safety and prevention, district news, and property owners’ rights and responsibilities in a variety of ways. We disseminate information through our website, social media, in person at our office and through our technicians in the field, through formal presentations at schools, community meetings, service groups, senior centers and through printed material available at member city offices and libraries throughout the district and through newspapers, radio and T.V. PSAs can be provided for city websites. Call for details or more information on the following:

  • Literature - Brochures, informational fact sheets, pamphlets, posters, and booklets outlining important information on disease-transmitting vectors and preventative strategies for District residents. Literature is provided free of charge to residents and businesses within our District.
  • Press Releases - Press releases are made available to local and regional news papers, radio, and television media sources to inform residents of important events within our District.
  • Community Fairs - Our District attends many community fairs and local insect fairs annually. We display information and provide literature on topics that are relevant to our residents. This provides our District with invaluable opportunities to reach both adults and children.
  • Educational Presentations - Our Education Specialist provides a variety of presentations for all age groups and regular visits schools, day cares and special interest group meetings.