West Nile Virus Is Active Near You: What Southern California Residents Should Know in 2026
West Nile Virus is active in Southern California, and 2026 conditions — extended warm temperatures, summer irrigation, and longer outdoor evenings — are creating near-ideal conditions for Culex mosquito populations to grow rapidly. Compton Creek Mosquito Abatement District explains what is different this season, why your evening routine matters more than you may realize, how irrigation creates hidden breeding sites in residential backyards, and the four actions residents in our 12.5 square mile service area can take this week to reduce their risk — including how to request free mosquitofish and report public breeding sites.
Every summer brings mosquito season. Every year, public health agencies remind residents to eliminate standing water and protect themselves from mosquito bites. So what makes 2026 different? It is not that West Nile Virus is new — the virus has been present in California for years, and mosquito abatement districts continuously monitor mosquito populations to help protect public health. What has changed are the environmental conditions that allow mosquito populations to grow more quickly, and the everyday habits that can increase exposure. Understanding those changes can help residents make small adjustments that reduce risk throughout the remainder of the season.
Warm Weather Has Created Conditions for Rapid Mosquito Development
Mosquitoes depend on warm temperatures to develop. During Southern California summers, mosquito eggs can develop into biting adults in as little as five to seven days when standing water is available.
Extended periods of warm weather produce a compounding effect on local mosquito populations:
Your Evening Routine Matters More Than You May Realize
Many residents spend more time outdoors during the coolest part of the day. That is also when the mosquitoes most associated with West Nile Virus transmission are most active. Culex mosquitoes — the primary West Nile Virus vector in California — begin actively searching for blood meals around dusk and remain active throughout the evening and overnight hours.
Common evening activities that occur during peak mosquito hours:
- 🌿 Watering the lawn or garden
- 🍽️ Eating dinner outside
- 🪑 Relaxing on the patio
- 🐕 Walking the dog
- 🎉 Attending outdoor gatherings or events
Irrigation Can Create Hidden Breeding Sites
Summer watering keeps landscapes healthy. It can also unintentionally create mosquito habitat. Many residential breeding sites are not large ponds or neglected swimming pools — they are much smaller, and they are easy to miss.
Inspect your yard after watering and look for standing water in these locations:
Heat and Body Chemistry Affect Who Gets Bitten
Not everyone experiences mosquito bites at the same rate. Mosquitoes locate people using biological signals — and some people produce stronger signals than others.
Warm evenings, outdoor activity, and physical exertion all increase these signals. If you tend to receive more mosquito bites than those around you, biology rather than bad luck may be a factor. Regardless of individual attractiveness to mosquitoes, EPA-registered repellents remain one of the most effective personal protection measures available.
What You Can Do This Week
The following habits, applied consistently throughout the remainder of the season, make a measurable difference for your household and your neighborhood.
Walk your yard every week. Empty, drain, or cover anything holding water — flower pot saucers, gutters, bird baths, and garden areas after watering are the most commonly missed sites.
Apply EPA-registered insect repellent before spending time outdoors in the evening. Oil of Lemon Eucalyptus (OLE) is a plant-based CDC-recommended option. Wear long sleeves and pants when practical.
Decorative ponds and water features should include circulation or mosquito control methods. Compton Creek Mosquito Abatement District provides free mosquitofish to eligible residents — a natural, chemical-free solution for permanent water features.
Standing water on public property, clogged storm drains, or neglected lots can become community breeding sites. Reporting these locations helps reduce mosquito populations throughout the neighborhood.
Found a Dead Bird? Report It.
Dead crows, ravens, and jays are early indicators of West Nile Virus activity. Call the California Dead Bird Reporting Hotline.
District Services Available to Residents
Compton Creek Mosquito Abatement District provides the following services at no cost to residents within our 12.5 square mile service area covering Compton, Lynwood, Paramount, and Rancho Dominguez.
For residents with ornamental ponds or water features. Up to 500 fish per day. Natural, chemical-free larval control.
Report standing water on public property — alleys, storm drains, neglected lots. We investigate every submission within our service area.
Mosquito prevention resources and seasonal updates for residents across our service area, including school education programs for grades 4–6.
We Are Here to Help
If you are noticing increased mosquito activity around your home, contact Compton Creek Mosquito Abatement District to request mosquitofish, report a public breeding site, or ask questions about mosquito activity in your neighborhood.
Contact CCMAD →