FAQ’s

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Mosquito Sources (11)

Pet water bowls should be washed every three days to remove potential mosquito eggs. If you have an automatic pet watering bowl, the automatic feature must also be cleaned. On the other hand, mosquitofish can be placed in troughs to prevent mosquitoes from breeding. If you would like mosquitofish, contact our office at 559-732-8606 or through the toll-free number 877-732-8606 during regular business hours.

Empty and clean by scrubbing birdbaths at least every three days. Chlorinating birdbaths can also help prevent mosquito breeding. Invasive Aedes mosquitoes can lay their eggs on the sides of the water in the birdbath and can remain dry, and viable, for up to a year. See Invasive Mosquito Species for more information about the invasive Aedes mosquitoes.

Properly maintaining and running the fountain will maintain a constant flow of water and prevent mosquitoes from breeding. Additionally, chlorinating, or using bleach, on the fountain will prevent mosquito breeding. The District also offers free mosquitofish for larger fountains. If you would like mosquitofish, contact our office at 559-732-8606 or through the toll-free number 877-732-8606 during regular business hours.

Fish and turtles are common types of animals that feed on mosquito larvae. Both small fish and small turtles will feed on mosquito larvae until they reach a certain size where they prefer to eat larger meals. However, mosquitofish will always eat any mosquito larvae because they will not grow more than about 3 inches. The District provides free mosquitofish for ponds, horse troughs, large fountains, and other water sources. If you would like mosquitofish, contact our office at 559-732-8606 or toll-free at 877-732-8606 during regular business hours. Since mosquitoes breed in stagnant water, maintaining a constant flow of water in the pond reduces mosquito breeding.

You can anonymously report potential mosquito sources using our online service request form, or call during regular office hours. We will not share your information.

There are several options available depending on the source. The District provides free mosquitofish for larger water sources like ponds, water troughs, and large fountains. Maintaining appropriate chlorination of swimming pools, hot tubs, fountains, and birdbaths will also prevent mosquito breeding.

Potential mosquito sources should be dumped at least once a week.

Mosquitoes need to lay their eggs on water or at the waterlines of standing water. Without standing water, mosquitoes cannot lay their eggs and the eggs cannot develop into adult mosquitoes. No standing water means no mosquitoes.

Most mosquitoes can develop from an egg to an adult in as little as 5-7 days. Some species can develop even quicker. Warmer weather shortens this time frame while colder temperatures increase it.

Mosquitoes can develop in water sources as small as a bottle cap or as large as a marsh. Different mosquito species prefers different water sources.

A mosquito source, also known as breeding source, is water where mosquito eggs, larvae, and pupae live and develop into adults. Any water source that lasts for 3 or more days is a potential mosquito source.

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