News and Announcements

Mosquito Pool Positive for West Nile Virus in Butler Borough
August 21, 2025
During routine testing, the Morris County Division of Mosquito Control found one mosquito pool positive for West Nile Virus (WNV) in Butler Borough. The positive mosquito pool was detected in a trap located in the area of Stony Brook Pool on Grace Valley Road.
The Division of Mosquito Control will be treating this area with synthetic pyrethroid insecticides that are recognized as an effective solution for mosquito control. The insecticide will be applied via all-terrain vehicle (ATV) during early morning hours on Saturday, August 23, and its residual is known to dissipate very quickly in the environment.
Residents are reminded to take precautions to reduce the risk of mosquito bites. Window and door screens should be repaired as necessary, and outdoor activities should be minimized at dawn, dusk and evening hours. Residents should wear long shirts and pants when outdoors and insect repellant may be sprayed on clothing and exposed skin in accordance with labeling instructions. Standing water should be eliminated in flowerpots, buckets, tires, pools, playground equipment, etc., and birdbaths should be emptied and refilled weekly.
Borough residents may consult the informational brochures available here for general information regarding mosquito-borne diseases and mosquito control on one’s property. Residents should report mosquito problems and standing water to the Morris County Division of Mosquito Control at 973-285-6450. For information about the Division of Mosquito Control and its efforts to prevent mosquito activity in our community, please check the Division’s website, which also includes updates regarding where and when mosquito spraying will take place: www.morriscountynj.gov/mosquito/
For more information regarding West Nile Virus and mosquito control, please check here.