Mosquito Control

The Clark County Health Department attempts to locate mosquito-borne diseases within the county. Once we identify West Nile, St. Louis encephalitis, or other mosquito-borne diseases, the Health Department focuses efforts to eliminate mosquito breeding sites in those areas and educate residents on how they can prevent mosquito infestations.


You Can Make A Difference

Residents can make an even larger impact than we can by learning how to prevent mosquito populations in the first place.

There are many steps that everyone should take to reduce mosquito populations around their home. While spraying for mosquitoes is sometimes thought of as the first line of defense against mosquitoes, personal protection and eliminating places where mosquitoes breed are the most effective and healthiest ways of preventing mosquito bites. The more people are involved, the greater the amount of control.

First, protect yourself from bites by using insect repellant or protective clothing. Some repellants may not be safe for children, so always read instructions before using repellants. Protection also means avoiding outdoor activity when mosquitoes are most prevalent—at dusk and dawn.

Second, eliminate mosquitoes at their source—stagnant water. It takes three to seven days for thousands of mosquitoes to develop in stagnant water.  Below are some helpful suggestions to reduce mosquito breeding sites around your home, apartment or business:

  • Remove old tires, buckets or anything that holds standing water, or empty them regularly.

  • Reduce runoff of water from sprinkler systems and use additional landscaping to absorb standing water on your property.

  • Keep your lawn mowed; mosquitoes typically rest in high grass and weeds.

  • Repair leaky pipes and outside faucets.

  • Keep rain gutters free of leaves and other debris that can trap water and allow for mosquitoes to breed.

  • Treat standing water that can’t be drained with a larvicide containing Bti, available at home and garden stores.

  • The picture below are mosquito larvae from a woodland pool, if you see these "wigglers" on your property these larvae will be biting mosquito adults within days!

  • To learn more about mosquito breeding sites from Purdue's interactive map click here.

  • If you operate or own a farm click here for some specific guidance for ensuring the safety of your livestock, family, and neighbors.



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