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County vector-control officials report no West Nile detections in San Bruno in 2024; outline trapping and treatment work
Summary
A San Mateo County Mosquito & Vector Control District representative told the City Council that the district responded to roughly 101 San Bruno service requests in 2024, performed about 670 site inspections and about 130 local mosquito treatments; the presenter said no West Nile virus was detected in San Bruno in 2024 and invited residents to a June 21 open house.
Casey, a staff member of the San Mateo County Mosquito & Vector Control District, presented the district’s 2024 activity in San Bruno and described ongoing surveillance and control efforts.
Casey said the district handled about 101 service requests from San Bruno residents in 2024, conducted about 670 site inspections in the city and carried out roughly 130 mosquito-control treatments there. He said the county sets out to treat juvenile mosquito habitats before the insects reach adulthood and that, for 2024, no human or horse West Nile virus cases occurred in the county; Casey reported 36 West Nile–positive birds countywide but said none were detected in San Bruno.
The presentation highlighted routine catch-basin work in storm drains, seasonal treatments at Mills Field (listed as SFO-owned habitat near San Bruno), and the district’s dead-bird reporting system. Casey said district crews treated catch basins throughout the county at two-week intervals during April–October; he described the program’s scope and stated that, in San Bruno, staff logged approximately 177,000 catch-basin treatments during the season. He also noted that the district sets adult mosquito traps and will intensify trapping if a West Nile–positive bird is found in an area.
Casey described common breeding sources on private property — abandoned pools, ponds and fountains — and urged residents to “dump and drain” standing water, especially when temperatures are high. He reminded residents that district services are funded through property taxes and that the public can request inspections without an extra fee. Casey closed by inviting residents to an open house on June 21, 2025.
The city’s Robert (who serves on the district board) thanked the presenter and Council acknowledged the report. No council action was taken.
Next steps: residents may report dead birds and request inspections through the district’s website; the district will continue routine catch-basin and larval surveillance through the warm season.
