Mosquito Control: 2025 History
| Control Date | Area(s) | Reason | Notes |
|---|---|---|---|
| 10/31/25 | Antioch | Invasive Aedes aegypti Mosquitoes | |
| 10/8/25 | Antioch | Invasive Aedes aegypti Mosquitoes | |
| 8/4/25 | Martinez | High 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: Friday, October 31st, 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.
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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 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.
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.
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.