Orange County Mosquito and Vector Control District
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The District's aggressive campaign against mosquito larvae is intended to minimize the need to use public health pesticides targeting adult mosquitoes. If West Nile virus is detected in the community, the District's initial response will be to intensify its efforts to reduce mosquito breeding sites and increase its levels of larviciding in those areas in which West Nile virus has been found. Reducing the population of adult mosquitoes with public health pesticides (adulticides) that are registered by the US Environmental Protection Agency (US EPA) will be done if necessary to prevent human illness or to suppress a heavy nuisance infestation of mosquitoes. The decision to use adult mosquito control application either by truck-mounted, handheld, or aircraft application equipment will be based on surveillance information or the documentation of West Nile virus activity at a level that indicates a threat to human health. Adulticing will be concentrated in areas most at risk for disease occurrence and will be conducted by certified and licensed applicators.

Threat Meter

2017 Current Treatment Schedule

Friday, August 25, 2017*
Approximate Time: 3:00 AM to 6:00 AM

Saturday, August 26, 2017
Approximate Time: 3:00 AM to 6:00 AM

*Follow up applications will be posted on the website. For ground based adulticiding treatments throughout Orange County click here. Applications may be postponed or delayed due to weather.


Treatment Area Interactive Map

Fully Interactive Map of Ground Based Adulticiding Locations


Community Information Meeting

Date: Wednesday, August 9, 2017
Time: 6:00 PM
Location: City Hall Atrium
                   110 E. La Habra Boulevard
                   La Habra, CA  90631

For more information contact the District at

Useful Information

Materials Used

AquaDuet™ [EPA Reg. No. 1021-2562-8329]




 Orange County Mosquito and Vector Control District