Large Area Mosquito Treatment History

Below is the history of large area treatments for 2026

Ultra Low Volume (ULV) Treatment

Application Date	Time	Location/City	Treatment	Reason	Status

Drone Treatment

Application Date	Time	Location	Treatment	Reason	Status
1/28/2026	8:00 a.m. - 10:00 a.m.	Fairview Park Vernal Pools, Costa Mesa	Vectobac GR	Mosquito abundance	Complete

Ground-Based Wide Area Larvicide (WALS) Treatment

Application Date	Time	Location	Product	Reasons	Status
1/14/2026	9:00 a.m. - 12:30 p.m.	Bolsa Chica Wetlands, Huntington Beach	VectoBac WDG	Mosquito abundance	Complete
2/6/2026	8:30 a.m. - 12:30 p.m.	Bolsa Chica Wetlands, Huntington Beach	VectoBac WDG	Mosquito abundance	Upcoming

Residential Truck-Mounted Application

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Frequently Asked Questions

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Mosquito Control Products

The District uses chemical control products when source reduction and biological control are not possible or efficacious. Learn more about the products the District uses here.