San Joaquin County Mosquito & Vector Control District

Mosquitoes aren’t just a nuisance; they’re a serious public health threat. Vector-borne diseases like West Nile virus (WNV) and dengue are spreading across the U.S. Here in San Joaquin County, WNV is active during the summer and the District monitors and responds to reduce the risk of disease to the public.

Make sure to protect yourself this summer by following these steps:
✔️DRAIN standing water around your yard and inspecting every week
✔️DETER mosquitoes from biting by using an EPA-registered repellent
✔️DRESS in loose-fitting layered clothing with long sleeves and pants
✔️DEFEND your home from mosquitoes by ensuring door and window screens are in good repair

Know someone who could benefit from these tips? Tag them in the comments and share this post to help spread mosquito awareness during National Mosquito Control Awareness Week.

Together, we can make mosquitoes a problem of the past!

Last week our District laboratory detected the first West Nile virus-positive sample of mosquitoes of 2026 here in San Joaquin County. The District will continue monitoring and testing throughout the season and will focus additional control efforts in areas with elevated mosquito activity or disease risk.

As temperatures increase this summer, West Nile virus activity will also increase, and we urge residents to protect themselves this summer:
✔️Wear an EPA-registered repellent when outdoors
✔️Wear loose, layered clothing, with long sleeves and pants
✔️Avoid being outside when mosquitoes are most active, at dawn and dusk
✔️Check your yard once a week to find and eliminate standing water where mosquitoes develop

Let's all stay safe this summer!

For more information, please visit our website at www.sjmosquito.org

West Nile virus detected along San Joaquin County delta San Joaquin County officials have confirmed the first detection of West Nile virus this season, sparking warnings for residents to protect themselves and prepare their homes.

🩸🦟 It's not too late to help save lives and "starve" a mosquito!

As we recognize National Mosquito Control Awareness Week (June 21-27, 2026), we're reminding our community that there's still time to sign up for our upcoming Starve a Mosquito! SJCMVCD Blood Drive!

Why a blood drive? Mosquitoes are infamous for their blood-feeding behavior, but unlike mosquitoes, blood donations make a positive difference. By donating blood, you're helping ensure local hospitals have the lifesaving resources they need while supporting awareness efforts during National Mosquito Control Awareness Week.

📍 Robert Cabral Ag Center
2101 E. Earhart Ave., Stockton, CA 95206
🗓 Thursday, June 25, 2026
⏰ 10:00 a.m. – 4:00 p.m.

A fun fact: A one pint blood donation is equivalent to more than 47,000 mosquito blood meals!

✅ Sign up today:
https://www.redcrossblood.org/give.html/drive-results?zipSponsor=SJmosquito

Unable to donate blood? You can still support National Mosquito Control Awareness Week following our page, sharing our posts, and helping spread awareness about mosquito prevention and mosquito-borne diseases.

NEWS RELEASE 6-18-26 (Stockton, CA): The First West Nile Virus-Positive Mosquitoes of 2026 Have Been Detected in San Joaquin County.

The San Joaquin County Mosquito and Vector Control District laboratory has detected West Nile virus in a mosquito sample collected from Upper Jones Tract in the San Joaquin Delta Islands. West Nile virus is commonly detected in San Joaquin County during the summer months as warmer temperatures increase mosquito activity.

Residents are encouraged to take simple steps to reduce their risk of West Nile virus:

•Dump and drain standing water around your home each week
•Use EPA-registered mosquito repellent when outdoors
•Wear long sleeves and pants when practical
•Ensure window and door screens are in good repair

The District will continue to conduct mosquito surveillance and disease testing throughout the season and focus control efforts in areas with elevated mosquito activity or disease risk.

View the full news release here: https://bit.ly/NewsReleasesSJCMVCD

The San Joaquin County Mosquito and Vector Control District will be closed on Friday, June 19, 2026 in observance of Juneteenth.

If you're spending time outdoors with family and friends, make sure to protect yourself from mosquitoes:

• Dump and drain standing water around your home
• Use an EPA-registered insect repellent
• Wear loose-fitting long sleeves and pants when mosquitoes are active

We wish everyone a happy and safe Juneteenth!

The San Joaquin County Mosquito & Vector Control District conducts ground or aerial mosquito control treatments in areas of San Joaquin County as needed to suppress the mosquito population during the warmer months.

Residents interested in District spray treatment operations can sign up to receive spray alerts by email or text. Spray schedules and maps are also posted on the District website: https://bit.ly/SJCSprayAlerts

🦟 Stay informed about mosquito control treatments in your area!

Mosquito control treatments applied by truck or aircraft are a part of our District’s Integrated Mosquito Management Program used to help prevent mosquito-borne disease and reduce mosquito populations in San Joaquin County. All products are applied according to label rates and in accordance with state and federal regulations.

Scheduled spray treatments are posted to our District website www.sjmosquito.org and residents can sign up to receive mosquito spray notifications directly by email or text message (SMS). By subscribing to alerts, you’ll receive timely notifications about upcoming mosquito control treatments.

✔ Receive alerts directly to your phone or email
✔ Stay informed about treatments in your area
✔ Free and easy to sign up

📲 Sign up today: https://bit.ly/SJCSprayAlerts

During the June 12th, 2026 Board of Retirement Meeting of the San Joaquin County Employees Retirement Association (SJCERA), our Administrative Assistant, Emily Nicholas, was recognized by SJCERA with an official Resolution in Appreciation of her 6 years of dedicated service on the Board.

The recognition took place during SJCERA's 80th anniversary celebration, making the occasion even more meaningful as the organization marked their octogenary milestone of serving public employees across San Joaquin County.

As a member agency of SJCERA, we are proud to see one of our own contribute her time, expertise, and leadership in support of the retirement benefits that help provide financial security for public employees across San Joaquin County. Thank you, Emily, for being our agency’s ambassador and holding the distinction as the first ever member on the Board of Retirement to represent independent special districts within their illustrious history.

Please join us in congratulating Emily on this well-deserved recognition!