Supervisor Doug Chaffee, Fourth District

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September 1, 2020

The Orange County Mosquito and Vector Control District (OCMVCD) is reporting a high number West Nile virus (WNV) positive mosquitoes in the City of Anaheim. Laboratory test results indicate a significant number of positive WNV mosquito samples in the area between Ball Road up to the 91 Freeway and Brookhurst up to East Street. The treatment to irradiate positive mosquitoes will take place on Wednesday and Thursday, September 2 and 3rd from 10:00 PM 5:00 AM. Please see the affected treatment area in the image below.

The presence of WNV positive mosquito samples and high abundance of mosquitoes increases the risk of residents getting bit by a mosquito capable of transmitting WNV. Below is a link with address look up for the treatment area:

The treatment product used is applied at extremely low rates (less than 1.3 fluid oz. per acre). At the application rate this product will not harm:

  • People or pets, even if present during application.
  • Finishes on cars or homes.
  • Fruit trees, vegetable gardens or fish ponds.

There is no need to turn off air conditioning systems during the application. The product is applied at a time when bees are not active. All products used by the District are approved by Federal and State regulatory agencies.

To avoid being bitten by mosquitoes, OCMVCD makes the following recommendations:

  • Eliminate any standing water around your house weekly in items such as
    trash cans, toys, tarps and containers.
  • Toss unneeded items that can hold water.
  • Clean bird baths, pet bowls and ponds. Neglected
    or non-circulating water features can breed
  • Dump water from flower pots and saucers. Avoid
    purchasing water-holding plants such as
    bromeliads and lucky bamboo.
  • Check gutters and curbs for standing water. Clear out any vegetation in gutters.
  • Make sure all window and door screens on your house are in good repair.
  • Wear a repellent containing DEET®, Picaridin, Oil of Lemon Eucalyptus, or IR3535. 


Doug Chaffee
Supervisor, Orange County Board of Supervisors