Request Service

The public is encouraged to request service from the District. These requests generally are either to report a mosquito-related problem, inquire about information on ticks, or insect identification. There is no charge for these services. At this time, Lake County residents can fill out the online service request form, contact the District by phone (707-263-4770), or by visiting the District Office (410 Esplanade St., Lakeport) during regular business hours (7:30 AM - 4:00 PM).

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Mosquitofish (Gambusia affinis) are indispensable to our mosquito control program in Lake County. The fish eat mosquito larvae. Mosquitofish are provided, without charge, to the public for ponds, unused swimming pools, animal watering troughs, and other water features. They require minimal feeding or care, other than to protect them from garden sprays, chlorine, chloramines, or other chemicals, and predators such as raccoons, cats, opossums, herons or egrets. Mosquitofish generally live peacefully with other pond fish.


Life Cycle

These fish do not lay eggs but give birth to well-developed and very active young. Therefore, they require no special environment for depositing and hatching eggs. Mosquitofish breed throughout the summer producing a new brood at monthly intervals. The newborn fish are approximately one-half inch in length and are immediately ready to begin the work of eating mosquito larvae. Gambusia grows rapidly, reaching a maximum size of about three inches. The fish become sexually mature when 4-5 months old; the earliest broods of the season are born in April to May. Mosquitofish can live 2-3 years.

Controlling mosquitoes with fish

Keeping a healthy population of fish in your pond or water feature is the first line of defense against mosquitoes. Goldfish and koi will feed on mosquito larvae but are not as effective as mosquitofish or other top-feeding minnows. Overfeeding your fish will also reduce their effectiveness for mosquito control.

How to obtain mosquitofish

To obtain free fish, Call or visit the District office. Mosquitofish are normally available from March through October. The District is always glad to provide mosquitofish to County residents, even on repeat calls, to encourage the biological control of mosquitoes in ponds and other permanent water features.


Insect Identification

We offer identification of suspected public health pests, such as mosquitoes, ticks, kissing bugs, termites, and ants. In order to have your specimen identified, please fill out our insect identification form, print it out, and submit your specimen(s) in person to the district office. Blank forms are also available at our district office. Get Adobe Reader.

How to submit a sample for identification:

  1. To avoid crushing it's best to use a hard-sided container (i.e. gladware, mason jar, pill bottle, etc.).
  2. Prompt submission is preferable. If insects are unable to be submitted immediately, please store them in the freezer. **When storing a tick or spider, please keep these specimens in the refrigerator.
  3. When available, submit multiple specimens as this aids in proper identification.

Report A Dead Bird

The West Nile virus dead bird testing season is here.  You can report your dead bird using this online form at any time during the year.  From April 15-October 15, you can also report dead bird using the WNV Hotline (877-WNV-BIRD; 877-968-2473).


Fill out an online form on the West Nile virus Website by clicking HERE


Call the Dead Bird Hotline: 877-WNV-BIRD; 877-968-2473

Disposal Guidelines