Austin Officials Urge Vigilance as Mosquito Season Kicks Into High Gear

Recent rains across Central Texas have triggered more than just wildflower blooms. Austin and Travis County health officials announced this week that mosquito season is now well underway, bringing with it the annual threat of West Nile virus and other mosquito-borne diseases that put residents and their pets at risk.

The city's Environmental Health Services Division is pushing a comprehensive prevention message as temperatures climb and standing water accumulates across the region. Last year, 41 mosquito pools in the Austin-Travis County area tested positive for West Nile virus, with five confirmed human cases requiring medical attention. Officials expect similar patterns this season unless residents take proactive steps to reduce breeding habitats.

"While we're all getting ready to enjoy the summer, let's be sure to bring mosquito repellent and appropriate clothing anytime we plan on spending time outdoors," said Marcel Elizondo, chief of the Environmental Health Services Division. "We've consistently seen West Nile virus for years, and this year shouldn't be any different. Taking time to protect yourself can keep you from getting sick or even needing to go to the hospital."

The health department is promoting what it calls the "Four Ds"—a simple framework for reducing mosquito exposure that has proven effective in communities across Texas. The first D addresses timing: many mosquito species, including those that carry West Nile, are most active during dusk and dawn hours. Limiting outdoor activities during these peak periods significantly reduces bite risk.

Clothing choices form the second D. Long sleeves and pants create physical barriers that mosquitoes struggle to penetrate. Light-colored, loose-fitting garments are particularly effective, as they make it harder for mosquitoes to locate skin and difficult for them to bite through fabric. Specialized mosquito-repellent clothing treated with permethrin offers additional protection for those spending extended time outdoors.

The third D is the one most people recognize: DEET. The Environmental Protection Agency has approved several insect repellent ingredients, with DEET remaining the gold standard for long-lasting protection. Health officials emphasize reading and following label instructions, applying repellent to both exposed skin and clothing, and reapplying as directed based on activity level and perspiration.

Perhaps the most impactful D is the final one: drain. Mosquitoes require standing water to complete their life cycle, and even small amounts—think clogged gutters, flowerpot saucers, or abandoned tires—can support hundreds of larvae. The city is urging residents to conduct weekly yard inspections, emptying any containers that collect rainwater and ensuring drainage systems function properly. Birdbaths should be refreshed weekly, and wading pools emptied when not in use.

The threat extends beyond human health. Mosquitoes in Central Texas also transmit canine heartworm, a potentially fatal parasitic infection that affects dogs and other mammals. Pet owners should ensure their animals are on veterinarian-prescribed heartworm preventatives year-round, as treatment for established infections is costly, risky, and not always successful.

Austin's mosquito surveillance program operates throughout the season, with traps placed strategically across the city to monitor population levels and detect disease presence. When West Nile virus is identified in mosquito pools, the city may authorize targeted spraying operations to reduce adult populations in affected areas. Residents can sign up for notifications about spraying schedules through the city's mosquito information portal.

The combination of Texas heat, recent rainfall, and urban development creates ideal conditions for mosquito proliferation. As temperatures continue climbing through May and into the summer months, health officials expect mosquito activity to intensify significantly. For Austin residents, the message is clear: prevention beats treatment, and personal responsibility complements public health efforts in keeping the community safe.

More information about mosquito prevention and city surveillance data is available at austintexas.gov/mosquito.