Around California
Conditions vary across the state. Choose your city below, then describe what’s happening around your home or business.
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Local mosquito information
Mosquito control in California
Learn what to look for around your property, explore your city, and ask about an inspection or a quote.
Mosquitoes in California: what to know
What to note
Where you see mosquitoes, how long it has been going on, and anything you’ve already tried are the most useful details to mention.
A useful next step
Ask about an inspection, what treatment would involve, and whether follow-up visits are included. You don’t need to identify the problem yourself before getting in touch.
Local research
Mosquitoes in California: what the public record shows
Before you compare quotes, it helps to know which mosquitoes actually live in California, when they are busiest, and what the state figures look like. Everything below links to the agency or university page it came from.
103 (0.26 per 100,000)
West Nile neuroinvasive disease cases, 2024
Neuroinvasive counts are the most reliable state comparison because nearly all severe cases are diagnosed and reported.
CDC132 cases, 12 deaths
Human West Nile cases and deaths, 2024
California's WNV burden is second only to Texas in most years; Central Valley and Los Angeles County drive counts.
California Department of Public Health / MVCAC117 cases, 11 deaths
Human West Nile cases and deaths, 2025
California's WNV burden is second only to Texas in most years; Central Valley and Los Angeles County drive counts.
California Department of Public Health / MVCACMosquito species recorded in California
- Yellow fever mosquito (Aedes aegypti) — CDC lists Aedes aegypti as more likely than Ae. albopictus to spread dengue, Zika, and chikungunya; prefers human hosts and lives in and around homes. Tropical, subtropical, and…
When mosquitoes are busiest in California
Washington DOH: detections from May (earliest) to October (latest). California reports its heaviest WNV activity in late summer; CDC peak is late August to early September.
CDC lists California among states with limited local dengue spread from Aedes aegypti.
Rules that apply in California
For context, nationally
Sources: CDC; California Department of Public Health / MVCAC; Potential Range of Aedes Mosquitoes. Figures are quoted as the source prints them. How we check our sources
Explore California cities
Anaheim
Mediterranean · urban setting
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Chula Vista
Mediterranean · urban setting
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Fremont
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Glendale
Mediterranean · urban setting
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Huntington Beach
Mediterranean · urban setting
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Irvine
Mediterranean · urban setting
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Long Beach
Mediterranean · urban setting
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Los Angeles
Mediterranean · urban setting
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Modesto
Mediterranean · urban setting
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Oakland
Mediterranean · urban setting
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Oxnard
Mediterranean · urban setting
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Sacramento
Mediterranean · urban setting
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San Diego
Mediterranean · urban setting
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San Francisco
Mediterranean · urban setting
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San Jose
Mediterranean · urban setting
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San Mateo
Mediterranean · urban setting
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Santa Ana
Mediterranean · urban setting
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Santa Rosa
Mediterranean · urban setting
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Stockton
Mediterranean · urban setting
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Sunnyvale
Mediterranean · urban setting
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