Pools, Ponds, Fountains,
and other Neglections

Residential Sources

Breeding Pool

Standing water around homes is a major breeding source for mosquitoes. Fishponds, fountains, birdbaths, neglected swimming pools and hot tubs can all produce mosquitoes under the right conditions.

Mosquitoes can also develop in discarded containers such as flower pots or buckets. As little as an inch of water in the bottom of a can is sufficient for mosquito development. Residents are encouraged to empty any water-holding containers and/ or store them upside down to prevent mosquitoes from developing. Unused swimming and wading pools should be covered and/or drained to prevent breeding.

Breeding Container

Residents can request assistance from the District for controlling mosquitoes in their own backyards. Many of these sources can be treated without pesticides by simply stocking them with mosquito fish. District staff will deliver fish, at no additional charge, to any private pond within the District. San Mateo County has over 2,300 backyard ponds, pools and fountains that can be treated with fish each year.