Northwest Mosquito and Vector Control District will perform an adult mosquito control spray treatment on Thursday, October 29th, 2026. The treatment will be conducted in the City of Riverside in the area West of Magnolia Avenue and South of Jurupa Avenue. This treatment is in response to West Nile virus presence in this area.  

The spray application will occur between the hours of 3:00 a.m. to 6:00 a.m. 

This area will be treated with Aqua-Reslin, a U.S. Environmental Protection Agency-registered insecticide (EPA Reg. No. 432-796), using truck-mounted Ultra-Low Volume (ULV) sprayers to control adult mosquitoes. Please see the map below for details on the treatment area. 

 The red shaded area indicates the planned treatment area. 

For more information about this treatment or any other District programs, please call (951) 340-9792, or email office@northwestmvcd.org.