Mosquito Control Activities


The District will conduct aerial larval control applications in the City of Palm Springs where detection of the invasive mosquito species Aedes aegypti has expanded rapidly. Eight applications are scheduled to take place on Saturday mornings between 5 and 7 a.m., weather permitting, starting July 29 through the end of September.

Aerial Application Schedule (please check weekly for updates):

  • Saturday, July 29
  • Saturday, August 5
  • Saturday, August 12
  • Saturday, August 19
  • Saturday, August 26
  • Saturday, September 2
  • Saturday, September 16
  • Saturday, September 30

The treatment product is applied in a manner that minimizes risks to human health, beneficial organisms, and the environment. Residents may choose to stay indoors during and for 30 minutes after application as a best practice to reduce exposure. Learn more about the aerial larval control application:

Please see the aerial route below and check the website weekly for future applications and updates.


Due to continued West Nile virus activity in the East Valley, the District will conduct aerial ultra-low volume (ULV) applications in rural areas where the positive mosquitoes were trapped to lower the mosquito abundance and reduce the risk of disease transmission to humans by infected adult mosquitoes. The applications are scheduled between 3:00 a.m. and 6:00 a.m., weather permitting, on Thursday, July 20, Friday, July 21, and Saturday, July 22. Applications could be extended should there be any weather delays. Please see the map below for details.

Control of Adult Mosquitoes
In the case of an increase in the number of mosquitoes in a particular area, or detection of an arthropod-borne virus in mosquitoes, wild birds, sentinel chickens or humans, the District may decide to conduct ground or aerial ultra low volume (ULV) adulticiding activities.

Ground ULV is carried out usually in urban areas with special equipment mounted on the truck to control adult mosquitoes. Aerial ULV is usually carried out in rural areas by helicopter or small airplane. The adulticides are applied at very low dosages. The low dosages, plus natural degradation by UV light and water, ensure minimal risk. The District uses a pyrethroid-based products for ground and aerial ULV adulticiding. Pyrethroids are a synthetic insecticide, modeled after a botanical insecticide produced primarily from the flowers of Tanacetum cinerariaefolium, which is a species of chrysanthemum plant family, which acts as the plant’s own insecticide to keep insects away.

At the time of adulticiding the District will post the information on its website as well as in the area. For questions, please contact 760-342-8287 or or email To be notified via email of any adulticiding activities, please click here.

If you would like to request that ground adult control applications are not made to your property, please click here and the District will try to accommodate the request without jeopardizing public health.