HAYWARD, CA September 21, 2026 – Recently the Alameda County Mosquito Abatement District (ACMAD) has found numerous invasive Aedes aegypti mosquitoes in Livermore between S Vasco Rd, East Ave and Hillcrest Ave. Aedes aegypti is an invasive mosquito that can transmit diseases such as dengue, chikungunya, and Zika. To reduce Aedes aegypti mosquitoes, ACMAD staff have gone door to door to inform…

HAYWARD, Calif. August 25, 2026 — The Alameda County Mosquito Abatement District (ACMAD) has confirmed the discovery of multiple Aedes aegypti mosquitoes in Hayward. This marks the first detection of the invasive species in the city. The District is working with city officials and agencies to inform residents and inspect properties. Aedes aegypti is not native to California and can transmit…

HAYWARD, CA August 13, 2026 - On August 12 multiple invasive Aedes aegypti mosquitoes were found in the Irvington neighborhood of Fremont. In response, Alameda County Mosquito Abatement District staff have increased mosquito monitoring and control efforts in the area and will conduct a truck-mounted larval treatment on August 14th during early morning hours to prevent additional adult mosquitoes…

HAYWARD, CA July 22, 2026 - On July 20th, the invasive mosquito Aedes aegypti was detected for the first time in Castro Valley. In response, Alameda County Mosquito Abatement District staff have increased mosquito monitoring and control efforts in the area and will conduct a truck-mounted larval treatment during nighttime hours on July 23 to prevent additional adult mosquitoes from emerging. 

HAYWARD, Calif. July 9, 2026 – Due to increased West Nile virus activity in the Newark area, the Alameda County Mosquito Abatement District (ACMAD) will conduct two adult mosquito control treatments to affected areas centered near Mayhews Landings Park and Birch Grove Park on Friday July 10th.

HAYWARD, CA. June 22, 2026 – In response to ongoing detections of the invasive mosquito species Aedes aegypti, known as the yellow fever mosquito, the Alameda County Mosquito Abatement District (ACMAD) is launching a new program to help reduce populations of this mosquito in Livermore.

 HAYWARD, Calif. June 17, 2026 – Due to increased West Nile virus activity in the Newark area, the Alameda County Mosquito Abatement District (ACMAD) will apply an adult mosquito control treatment to the affected areas between Newark Blvd, Cedar Blvd and Mayhews Landings Rd starting at 11:00pm on Wednesday, June 17th.

First West Nile Virus-Positive Mosquito Sample Detected in Alameda County in 2026