City’s Outdoor Warning Sirens Undergoing Routine Maintenance Week of Oct. 10

City’s sirens will be activated individually during evaluation

NAPERVILLE, Ill. — Annual maintenance will take place on the City’s outdoor warning sirens beginning Monday, Oct. 10. During this time, the City’s warning siren contractor Braniff will activate each of the City’s outdoor warning sirens individually for evaluation. Residents should not be alarmed if they hear the sirens during periods of calm weather. Audible testing each day will only take place between the hours of 8 a.m. and 5 p.m. The City anticipates the routine maintenance to be complete by Oct. 14.

This annual maintenance is unrelated to the nationwide changes that were made earlier this year by the siren manufacturer following an investigation into why Naperville’s sirens did not activate during the July 23, 2022 tornadoes. The resolution of that issue is available in a Manager’s Memorandum released Aug. 4, 2022.

The City reminds residents that outdoor warning sirens are activated for the purpose of alerting people who are outdoors that a tornado warning has been issued for the Naperville area. When an outdoor warning siren is heard during severe weather, it is imperative to find shelter immediately. In addition to the outdoor sirens, residents are encouraged to monitor their preferred local media outlet, NOAA Weather Radio or the National Weather Service website at for the latest weather forecasts.

For more information on the City of Naperville, visit To sign up for the City’s notification system Naper Notify and receive important emergency and community information via a phone call, text message, email or smart phone app, visit

About Naperville: Located 28 miles west of Chicago, Naperville, Ill., is home to approximately 145,000 people. This vibrant, thriving city consistently ranks as a top community in the nation in which to live, raise children and retire. The city is home to acclaimed public and parochial schools, the best public library system in the country, an array of healthcare options and an exceptionally low crime rate. Naperville has ready access to a variety of public transportation, housing and employment options. The city’s diversified employer base features high technology firms, retailers and factories, as well as small and home-based businesses. Residents also enjoy world-class parks, diverse worship options, the opportunity to serve on several City boards and commissions, a thriving downtown shopping and dining area, a renowned outdoor history museum known as Naper Settlement and an active civic community. For more information, please visit our website at