Public Safety

San Diego County schedules mosquito treatments to reduce West Nile risk

County vector-control crews announced treatment work aimed at limiting mosquitoes that can spread West Nile virus.

Image credit: CDC / Jim Gathany, public domain; illustrative Culex mosquito photo

San Diego County announced mosquito-control treatments on September 22 as part of its West Nile virus prevention work. The county directs residents to its Vector Control Program for treatment-area information and advice on reducing mosquito breeding around homes. The announcement is a prevention notice, not a report that every mosquito carries the virus or that every neighborhood is being treated.

What it means locally

The county lists the notice in its 2026 Vector Control press-release archive and links residents to current treatment-area information. Vector control targets mosquito populations as a preventive public-health measure.

Residents can reduce breeding sites by emptying standing water and can check the county’s Vector Control pages for the latest map and guidance. The September 22 announcement should not be used as a live health alert; follow current county updates for any later changes.

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