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Contra Costa mosquito district warns of invasive Aedes aegypti presence; Oakley trustee outlines facility rebuild
Summary
At the March 10 Oakley City Council meeting, the city's mosquito district trustee reported the district's $11 million revenue baseline, an $8.5 million capital drawdown to rebuild an aging Concord facility, and concern about Aedes aegypti established in Antioch; residents were urged to remove standing water and report mosquito sightings.
Michael Krieg, Oakley'appointed trustee to the Contra Costa Mosquito & Vector Control District, briefed the council on public‑health work and operations, citing the district's roughly $11 million in typical annual revenue and a planned facility rebuild that will substantially use a dedicated reserve and an additional loan.
Krieg said the district has about 35 full‑time employees and uses seasonal staff in warm months. He summarized vector concerns, highlighting the invasive Aedes aegypti found in Antioch and warning that warmer winters make survival and re‑establishment more likely. Krieg stressed personal prevention steps for residents: remove standing water, report mosquito sightings for field investigation, and consider larvicide products such as mosquito dunk for hard‑to‑empty containers.
On infrastructure, Krieg explained that foundation, structural, electrical and safety problems at the district's Mason Circle site in Concord prompted a multi‑year rebuild expected to be complete in September; repair costs will largely draw on an $8.5 million capital reserve built up for this purpose and an additional loan, he said.
Krieg also described a late‑season surge of minor nuisance mosquitoes in the Bethel Island and Summer Lake areas tied to intentional irrigation of farmland, which produced inland floodwater mosquitoes (Aedes vexans) that are aggressive biters but are not primary West Nile virus vectors. The district said it will continue coordination with farmers to improve advance notice and response planning.
Councilmembers thanked Krieg for the update and had no follow‑up actions at the meeting minutes level.
What residents should do: report mosquito sightings to the district (phone, website or anonymous report), dump standing water, and use commercially available larvicides for stormwater containers and other standing water that cannot be emptied.
