MMSD Storm Update September 3rd, 2026

MMSD is reporting the following information (see the 5-day letter) to the Wisconsin Department of Natural Resources regarding a combined sewer overflow that occurred on September 3rd, 2026. 

Intense rainfall triggered an isolated combined sewer overflow into Lincoln Creek at 32nd St. and Hampton in Milwaukee around 10:00 a.m. on 9-3-26. One rain gauge in the area measured two inches of rain in an hour.

Overflow Volume: 

• 9/3/26 - Overflow volume of 331,500 gallons

One inch of rain in MMSD's service area equals 7.1 billion gallons of water.

To view a map of the impacted waters from the sewer overflow in the Greater Milwaukee area.

Additional Resources

Text WATERDROP to 414-296-4422 Para español, envía GOTADEAGUA al 414-296-4422

Receive Water Drop Alert text messages when heavy rain threatens the area. When a Water Drop Alert has been issued, a reminder is sent to use less water.

What do you do when an alert is issued?

• Hold off on washing dishes and laundry
• Take a shorter shower 
• Empty your rain barrel

Heavy Rains = Dangerous Rivers   

Please be safe around our concrete-lined rivers. STAY OUT of the concrete-lined channel since the water is fast-moving and the concrete is slippery. Call 911 if someone is in danger. We need your help in keeping our community safe.

IMPORTANT! Water in the Basement can be dangerous

1. Do not go into a basement with standing water. Electricity + Water = Danger.
2. Call your municipal public works department to report the problem. If your municipality is unable to help you, call MMSD at (414) 272-5100 or report a wet basement.
3. Call your homeowners/renters insurance agent.
4. Wait for the water to drain out of the basement before entering. Or, call a qualified electrician to disconnect the power before you enter a flooded basement.