Outdoor Warning Sirens

The Emergency Communications Network is responsible for the maintenance and repair of the outdoor warning siren system located throughout St. Louis County.

Remember that the outdoor warning sirens are designed to be heard outside. The Office of Emergency Management still recommends that weather alert radios be used inside homes and business.

The outdoor warning sirens are tested monthly, weather permitting, on the first Monday of the month at 11:00 AM.

St. Louis County provides an interactive map of all 204 outdoor warning sirens. Click on any of the icons on the map to be taken to that place on the map. You can also view a larger version of this map by clicking here. You may also search for siren locations by zip code, by scrolling down to "St. Louis County Outdoor Warning System by Zip Code" below.