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Wide-area Adult Mosquito Treatment Planned for City of Norco

May contain: neighborhood, road, outdoors, city, intersection, and urban

Due to the detection of West Nile virus (WNV) activity and elevated mosquito abundance, the district will perform adult mosquito spray treatments on August 23rd., 2023 to lower the mosquito population affecting residential areas within the City of Norco. The spray application will be conducted between the hours of 3:00 am to 6:00 am at the following location: the residential area between First St. & Third St., and between Valley View Ave & Temescal Ave. Please see attached images for the exact spray route. 

                The district will treat these areas with Aqua-Reslin (EPA Reg. 432-796), which is approved for use in mosquito control by the US EPA.  We have been working hard to use Integrated Pest Management Practices in these areas, and the majority of our efforts focus on preventing mosquito breeding and killing mosquito larvae before they become flying adults; However, due to elevated WNV activity detected within this area, we have decided that adult mosquito control via truck-mounted ground fogger is our best means to control the current mosquito populations in these areas. Signs were posted on August 21st., 2023 in the areas affected by our spray application.  Information regarding the treatment will be posted on our website at If there are any questions or concerns, please contact the district at 951-340-9792.

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