City to Conduct Ground Spraying for West Nile Virus July 15-16, 2025
Published on July 15, 2025
Tarrant County Public Health notified the City of Arlington that two of its mosquito trap samples have tested positive for West Nile Virus.
The City is following new guidance from TCPH regarding when to conduct targeted ground spraying. Only one of the two reported positive mosquito traps meets the threshold to spray. As a result, Arlington will conduct targeted ground spraying within a half-mile radius of the trap in the area of Helen Drive and Hadley Drive.
Helen Drive at Hadley Drive Targeted Ground Spraying Map(PDF, 445KB)
Targeted ground spraying will be conducted in this area between 9 p.m. and 5 a.m. on Tuesday, July 15 and Wednesday, July 16, weather permitting. This targeted ground spraying schedule is intended to reduce the known virus-infected adult mosquito population as quickly as possible.
The second positive trap was located near Park Hill Drive and Mossy Oak Street.
Targeted Ground Spraying
From May through October, the City of Arlington traps mosquitos to be tested by Tarrant County Public Health for the West Nile and St. Louis Encephalitis Viruses. These weekly test results help the City identify areas where to conduct targeted ground spraying with an ultra-low volume application of water-based permethrin product to reduce adult mosquito populations to prevent human infections.
If samples collected from a mosquito trap test positive for three weeks in a row, the City's contractor will spray within a half-mile radius of the trap site over two consecutive nights. Arlington could decide to conduct targeted ground spraying around a trap location after only one week or two weeks of positive test results when additional key risk factors are present:
- Mosquito abundance (a positive virus test result with more than 50 mosquitoes in a trap)
- Proximity to any recent human West Nile Virus cases
- Scheduled outdoor events during dusk or nighttime hours near a positive mosquito trap location
- High West Nile Virus infection rate in collected mosquito sample
For more information about the targeted ground spraying, please call the City of Arlington's Action Center at 817-459-6777. Download the City's free Ask Arlington app today to report standing water or mosquito infestations on private property.