Wide Area Larvicide Spraying

We are conducting a series of wide area larvicide spray treatments to eradicate the aggressive Aedes aegypti mosquito, before it can establish a permanent population in our county.

The treatments are taking place in the affected neighborhoods in multiple areas within San Jose, and in areas within Santa Clara and Gilroy. For detailed list of neighborhoods affected, please visit our Invasive Mosquitoes page.

 We are carrying out a thorough eradication plan in the surrounding area, trapping adult mosquitoes, inspecting properties to find areas where mosquitoes can lay their eggs, and treating any mosquito larvae we find with pesticide. However, we will escalate our mosquito-control methods as needed to include wide area larvicide spraying. 

Wide area larvicide spray treatments are necessary to protect public health from an invasive species that is capable of spreading the viruses that cause Zika, dengue fever, yellow fever and chikungunya. If Aedes aegypti gains a foothold in Santa Clara County, it would negatively affect our quality of life. These treatments allow us to target hard-to-reach sources of stagnant water that we have not been able to access.

Below is the list of scheduled treatments. For a list of frequently asked questions or a copy of our press release, please see the links at the bottom of this page.

Please note treatment maps are tentative areas and are subject to change depending on our most recent mosquito detection results.