Mosquito Spraying

Published on June 26, 2025

City of Aurora’s Street Maintenance Division Begins Yearly Mosquito Abatement Program

The City of Aurora’s Street Maintenance Division has begun its yearly mosquito abatement program, aimed at curbing the spread of the West Nile Virus, while protecting residents from swarms of biting mosquitoes.

The Division’s efforts consist of both in-house and contracted services, starting with the treatment of approximately 12,000 catch basins throughout the city. These basins are equipped with environmentally friendly “Natular Tablets,” which are organic products that mosquito larvae feed upon. Following the ingestion of the product, the larvae are prevented from growing into an adult mosquito and becoming a nuisance.

The City of Aurora has also deployed five mosquito light traps located throughout the community. These traps are emptied three times per week by the city’s contracted mosquito management company, Clarke Environmental. Female mosquitoes in the trap are counted, as they cause the majority of bites. If the number counted exceeds 30, the Street Maintenance Division will spray the insecticide Anvil ®2+2 Ultra-Low-Volume (ULV) in the affected area only.

Anvil ®2+2 ULV is sprayed through a truck-mounted fogging unit, which dispenses aerosol droplets (fog) that stays aloft, thereby killing mosquitoes on contact. The amount of insecticide sprayed by this unit is small compared to the area treated, usually consisting of about three to five ounces per acre, which minimizes exposure and risks to people and the environment. Additionally, all insecticides used for mosquito control in Illinois must be registered with the U.S. Environmental Protection Agency (USEPA) and the Illinois Department of Agriculture (IDA).

Aurora residents should expect fogging operations to take place at dusk. This is typically when mosquitoes are most active and looking for food, primarily consisting of human or animal blood. The aerosol fog primarily targets flying mosquitoes, which is why the timing of the spray is critical. Although no law in Illinois requires local governments to notify residents before conducting mosquito fogging operations, Clarke Environmental will continue to monitor and update the Street Maintenance Division of any news that could impact overall public health and safety.

Currently, the Illinois Department of Public Health reports over 15 cases of West Nile Virus throughout DuPage County alone, out of nearly 100 cases throughout the state. The City’s proactive efforts in mosquito abatement will ensure safety, health, and wellness for all residents during the summer months.

For more information on the City of Aurora’s mosquito abatement program, or to sign up for notifications for when specific neighborhoods will be sprayed, residents are encouraged to reach out to Clarke Environmental directly at (800) 942-2555.