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Mosquito Control: 2025 History

Control DateArea(s)ReasonNotes
10/8/25AntiochInvasive Aedes aegypti Mosquitoes
8/4/25MartinezHigh Mosquito Population

Due to the detection of the invasive species Aedes aegypti mosquito in the area, the Contra Costa Mosquito and Vector Control District (District) will be using truck-mounted, Wide Area Larvicide Spray equipment to control larval mosquitoes in the following area: Antioch. 

DATE: Wednesday, October 8, 2025

TIME: Between 3:00 a.m. and 6:00 a.m., weather permitting.

The area to be treated is bordered on the north by Mountaire Drive and Ashburton Drive; on the south by Brookside Drive and Burwood Way; on the east by Barmouth Drive; and on the west by Garrow Drive.

Aerial view of a residential neighborhood with winding streets, houses, a park, and a sports field outlined by a white border.

MATERIALS USED: The public health pesticide to be used is VectoBac WDG, which is a bacterial larvicide that only impacts mosquito larvae — the young mosquitoes as they grow in the water. This bacterial larvicide does not impact other insects or animals. The public health pesticide will be applied at a rate of 8 ounces per acre by truck-mounted Wide Area Larvicide Spray equipment. 

 

 

Due to the high number of mosquitoes in the area, the Contra Costa Mosquito and Vector Control District will be using truck-mounted, ultra-low volume equipment to control adult mosquitoes on the evening of Monday, August 4th, 2025, in the following area(s): Martinez.


Time: Between dusk (approximately 7:50 p.m.) and 11:00 p.m., weather permitting.

The area to be treated is bordered on the north by the Carquinez Strait and Suisun Bay; on the south by Embarcadero Street, Escobar Street, Marina Vista Avenue, and Waterfront Road; on the east by Pacheco Slough; and on the west by Embarcadero Street.

Aerial view of a landscape with highways, a bridge, industrial areas, and a large outlined section near a water body.

 

MATERIALS USED: The public health pesticide to be used is  Zenivex E4 RTU applied at a rate of 1.5 ounces per acre by truck-mounted ultra-low volume equipment.