Contact Us:
district@sjmosquito.org
(209) 982-4675 or 1-800-300-4675

Office Hours:
Monday - Friday
7:00 a.m. to 3:30 p.m.

Address:
7759 S. Airport Way
Stockton, CA 95206-3918

Manager's Message - August 4, 2026

The District has changed how it responds to mosquito problems at individual residences. Residual adulticide treatments will no longer be a standard part of the District's response to residential service requests.

San Joaquin County Mosquito & Vector Control District will continue to provide adulticide spray treatments, but this method will be reserved solely for TARGETED WIDE AREA CONTROL (i.e. ground and aerial) based on information gathered by surveillance data. This includes, but not limited to, spraying adulticide due to the presence and detection of mosquitoes that vector disease and virus.

Residents within all of San Joaquin County can still request service for mosquito problems. For mosquito service requests, residents must be home for a mosquito control technician to perform a yard inspection. Once the mosquito control technician inspects the property, they will provide tips to reduce the number of adult mosquitoes and treat any larval sources found during their inspection.

Only under exceptional circumstances will the District treat the individual residence with a residual adulticide.

The District's mosquito-borne disease surveillance program tests mosquito samples and dead birds for West Nile virus (WNV). The results below reflect cumulative positive detections in San Joaquin County for 2026 through the date listed below.

Last Updated: July 29, 2026

Positive Mosquito Samples
51 total for 2026

Positive Dead Birds
3 total for 2026

View Map of San Joaquin County West Nile virus Activity, Year to Date: WNV Activity Map
Click here for California West Nile virus activity: westnile.ca.gov

Mosquito populations increase as the weather gets warmer. Effective mosquito prevention starts at home. Perform weekly yard checks to remove all standing water around your property. Report significant mosquito problems to the District. See tips to prevent mosquito bites.

Day Biting Mosquitoes

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The yellow fever mosquito, Aedes aegypti, and Asian tiger mosquito, Aedes albopictus, have become established in some areas of California. Aedes aegypti were first found in Stockton, CA in 2019 and are now present in every San Joaquin County city. These species can develop in artificial containers holding as little as a tablespoon of water.

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Public Information Outreach

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Through public information and outreach, the District provides updated and timely information and educational material to inform the public. This includes news releases, community events, presentations, YouTube, Facebook, Instagram, Brochures and Publications, Mosquito Detective children's worksheets, and the Mosquito Quiz.

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