West Covina, Calif. (October 2, 2026) — The San Gabriel Valley Mosquito and Vector Control District (SGV Mosquito) will be conducting residential mosquito control treatments via truck in Altadena and Monterey Park. The application is being conducted in an effort to reduce the number of mosquitoes in the area that create a significant public health risk. SGV Mosquito will use ultra-low volume adulticide and low volume larvicide applications to target mosquitoes at multiple life cycle stages to control the population and reduce the risk of mosquito-borne disease.

The mosquito control treatments will be conducted Wednesday, October 7th and Thursday, October 8th between 12AM – 5:30AM. The Monterey Park treatment will occur in the area between W. Floral Dr. and the 60 Freeway, east of Vancouver Ave. and west of Collegian Ave. The Altadena treatment will occur in the area between Glenrose Avenue and Marengo Avenue, south of E. Mariposa Street and north of W. Woodbury Road.

TREATMENT AREA - ALTADENA

TREATMENT AREA - MONTEREY PARK

SGV Mosquito specialists will be applying Aquaduet to target adult mosquitoes in both treatment areas. AquaDUET contains Sumithrin and Prallethrin®, active ingredients formulated to mimic the properties in chrysanthemum flowers. Since the material is suspended in water, the application will not harm the finishes on cars or homes. In Altadena, specialist will also apply VectoBac WDG, a biological larvicide which contains Bacillus thuringiensis subsp. israelensis, to water sources containing immature mosquitoes to reduce the number that develop into biting adults. If weather conditions are not favorable, or if there are operational delays, the application may be postponed or delayed.

Every effort will be made to notify residents in the treatment areas through physical postings, social media, Nextdoor, and news media. The public is also encouraged to visit the District’s website (www.SGVmosquito.org) for the latest information on mosquito activities.

Mosquito control is a shared responsibility and as mosquito activity increases, residents must take an active role in reducing the threat of mosquito-borne diseases to themselves and in their neighborhoods.

Follow the tips below to reduce mosquito populations on your property:

• Eliminate standing water in clogged rain gutters, rain barrels, discarded tires, buckets, watering troughs, or anything that holds water for more than a week.
• Ensure that swimming pools, spas, and ponds are properly maintained.
• Change the water in pet dishes, birdbaths, and other small containers weekly.
• Report neglected swimming pools in your neighborhood to your vector control district.

Follow the tips below to prevent mosquito bites:

• Apply mosquito repellent to exposed skin before going outdoors and reapply as recommended on the label.
• Wear insect repellent containing CDC and EPA approved active ingredients: DEET®, Picaridin, IR3535, or Oil of Lemon Eucalyptus.
• Wear light-colored, long-sleeved shirts and long pants.

For more information about the mosquito control treatments in Altadena and Monterey Park, visit www.PublicHealthMosquito.org. Residents can contact the San Gabriel Valley Mosquito and Vector Control District at 626-814-9466, online at SGVmosquito.org, or on social media: Facebook, X, and Instagram.

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Media Contact

Anais Medina Diaz, Director of Communications

626-814-9466, amedinadiaz@sgvmosquito.org