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Ground-based mosquito control efforts

The goal of OCMVCD is to protect the public health of residents from mosquitoes and mosquito-borne diseases. The decision to use larval or adult mosquito control application either by truck, backpack, or aircraft application will be based on surveillance information or the documentation of West Nile virus activity at a level that indicates a threat to human health.

Ground ULV Treatment Schedule

Adult mosquito control will occur when there is a increase in the number of mosquitoes in a particular area, or detection of an virus activity in the mosquitoes. The District conducts adult mosquito control by using ultra low volume (ULV) adulticiding equipment.  Public health pesticides (adulticides) that are registered by the US Environmental Protection Agency (US EPA) will be used to reduce adult mosquito populations and mosquito-borne disease risk.

Application DateTimeLocationTreatmentReason
10/20 - 10/226:10 PM - 7:10 PMBolsa Chica / Harriet Wieder - Huntington BeachTruckHigh Trap Counts


Active Location Map


Ground WALS Treatment Schedule

Wide Area Larvacide Spray FAQs

WALS stands for Wide Area Larvicide Spray. WALS is an approach to larval control that uses a form of larvicide, which targets immature mosquitoes in the water using a naturally occurring bacterium to kill mosquito larvae before they emerge into biting adults. Control of mosquitoes while in the larval stage is the backbone of most mosquito control programs in California. 

Application DateTimeLocationTreatmentReason
10/139:00-11 AMBig Canyon - Newport BeachTruckHigh Trap Counts

For more infomation or to see if you are in the treatment area click here