Adult Mosquito Control Updates

We conduct adult mosquito control treatments when public health is at risk - for example, when we detect West Nile virus in mosquitoes or to slow spread of invasive mosquitoes. Sign up online for email alerts or call 650-344-8592 to request to be added to the email notification list.

**Any scheduled treatment may be postponed, canceled or rescheduled due to unfavorable weather conditions and/or other reasons**

Scheduled Adult Mosquito Control Treatments:

No treatments currently scheduled.

Completed Adult Mosquito Control Treatments:

Truck-mounted mosquito control using DeltaGard® is scheduled for the morning of Sunday, October 18 between 4 and 6am in areas of North Fair Oaks and Redwood City (Redwood Oaks neighborhood). Map of the treatment areas is below. Press release contains additional information.

Page last reviewed: October 20, 2026

Adult Mosquito Control

San Mateo County Mosquito and Vector Control District takes a preventative approach to mosquito control. Whenever possible, mosquitoes are controlled in their immature stages, before they emerge as biting adults capable of transmitting disease to humans.

FAQS about Adult Mosquito Control

Products for Adult Mosquito Control

'Mosquito adulticides' are products used to control adult mosquitoes. We use only EPA-registered adulticides, which are only applied by licensed applicators and only in areas with high numbers of adult mosquitoes, areas where mosquito-borne pathogens have been detected, or other cases where public health is at risk.

Scheduled Adult Mosquito Control Treatments:

Completed Adult Mosquito Control Treatments:

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