Mosquito surveillance data reports the abundance of various species of mosquitoes in San Mateo County.
Different mosquito species have different seasonal life cycles, bite different hosts at different times of day, and transmit different diseases. It’s important for District staff to know what mosquito species are present in order to minimize annoyance and, more importantly, disease risk to humans and domestic animals.
These graphs track the number of mosquitoes of each species (vertical axis) by month (horizontal axis). These are frequently compared to a five-year average of each mosquito species by month, allowing staff to determine whether we have more, less, or about the same mosquito populations as most years.
Monthly abundances of five common mosquito species in San Mateo County, Aedes dorsalis, the summer salt marsh mosquito, Culex erythrothorax, the tule mosquito, Culex pipiens, the northern house mosquito, Culex tarsalis, the western encephalitis mosquito, and Culiseta incidens, the cool weather mosquito.
Click on the graphic below to see the population fluctuation this spring and summer.