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West Nile Virus Information


West Nile Virus Status at Naperville Park District Parks

Update 8/28/18 - Positive batches of West Nile mosquitoes were found at Knoch Knolls Park, Sportsmans Park and Arrowhead Park on Iroquois.

Update 8/21/18 - Positive batches of West Nile mosquitoes were found at Knoch Knolls Park

Update 8/15/18 - Positive batches of West Nile mosquitoes were found on Common's Drive (Diehl and Mill St) by Century Farm Park and Nike Sports Complex

Update 8/1/18 - Positive batches of West Nile mosquitoes were found at Seager Park and Knoch Knolls Park.

The City of Naperville regularly tests mosquito traps throughout the community for instances of West Nile Virus. Naperville Park District staff feels that it is necessary to inform people of initial findings in our parks so that they can take the necessary precautions.

More information about the City’s mosquito control program is available at:

Current Personal Protection Index (PPI) Chart - CLICK HERE FOR TODAY'S RISK LEVEL

To help DuPage County residents protect themselves against West Nile virus (WNV), the DuPage County Health Department has created a Personal Protection Index (PPI) that will inform residents of the amount of WNV activity in the county, as well as prevention steps that are recommended.

The PPI provides residents with a current snapshot of WNV activity, ranging from zero to four, with zero being no activity and four announcing multiple human cases of WNV in DuPage County.

The PPI will be updated every Wednesday at 3:00 p.m., by Health Department staff, during the surveillance season.  The PPI will change to match the risk level determined for that period.

When activated, residents should follow the 4 D's of prevention that coincide with the PPI risk level.

Drain:  Drain those items that collect standing water around your home, yard or business.  Scrub and refill pet water dishes and bird baths regularly.

Defend:  Use an insect repellent containing DEET when outdoors and reapply according to directions.

Dress:  Wear long pants, long sleeves and closed toe shoes when outside to cover the skin.

Dusk & Dawn:   Wear repellent outdoors during these prime times for mosquito activity.

Fight the Bite Fact Sheets:
10 things to know about mosquitoes
Mosquito control begins at home
Be a responsible pool owner
Tips for parents
Kids can fight the bite
WNV and pets
Seniors are at greatest risk
Repellents reduce the risk
What is DEET?
What is adulticiding?
Online tool for reporting dead birds
What is Lyme disease?
Lyme disease and pets
Tick ID chart

The best way to prevent West Nile disease or any other mosquito-borne illness is to reduce the number of mosquitoes around your home and to take personal precautions to avoid mosquito bites. Precautions include:

Whenever outdoors between dusk and dawn, wear shoes and socks, long pants and a long-sleeve shirt. Loose fitting, light colored clothing is best. Consider staying indoors at dusk and dawn, which is peak mosquito-biting time.

Apply insect repellent to exposed skin when outdoors. The most effective repellents contain DEET. Use caution when applying repellent to children. Products containing 10 percent or less DEET are the most appropriate for children from 2 to 12 years of age. Use repellents as directed by the manufacturer.

Install tight-fitting window and door screens. Check for and repair any tears in residential screens, including porches and patios. Try to keep doors and windows shut, especially at night.

Reduce or eliminate the amount of standing water around your home. Remove old tires, tin cans, flower pots and buckets and change the water in birdbaths at least once a week. Any container holding water for more than four days can become a breeding ground for thousands of mosquitoes.

Keep gutters clear of debris.

Keep grass cut short and shrubbery well-trimmed around your home.

Eliminate yard ruts and puddles.

Aerate ornamental ponds or stock with larvae-eating fish.

Use Bacillus thuringiensis israelensis (Bti), available in hardware stores, in any standing water around your home.

For more information on the City of Naperville’s mosquito control program, visit

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