California note · Home and property
Mosquito season is local, but West Nile tracking is statewide
California's West Nile Virus site gives residents a statewide place to check activity, report dead birds, and connect the issue back to local mosquito control.
Mosquito season feels local because it is local. A backyard bucket can matter. So can an old pool, a creek edge, a wet spring, or a warm week. West Nile tracking adds a state map to that local issue.
California’s West Nile Virus site is the state place to check reported activity, find a local vector agency, and report dead birds. West Nile infections are most common in summer and early fall, but mosquitoes are active year-round in California. The online dead-bird form is available year-round.
The home habit is small. Dump standing water. Fix screens. Use a label-approved repellent when mosquitoes are active. Report dead birds through the official site. If bites are heavy around a property, contact the local mosquito or vector control agency instead of guessing where they are breeding. A surveillance map is useful context, not a medical diagnosis or a promise that an area has no risk.
Where to see it
California West Nile Virus site and local mosquito or vector control districts.
Official sources
Official source trail
Reviewed July 14, 2026
California Porch explains the path. The official source is still the place to confirm the current rule, fee, form, map, deadline, or office decision.
Use the official page before you spend money, file paperwork, rely on a deadline, or change a property.
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