GIS Maps and Data
Rain Gauge Data
Water Equity Task Force
Blue Notes Newsletter
Blue Notes Newsletter Sign-up
What We Do
Milwaukee Estuary AOC
Dredged Material Management Facility
Lincoln Park Oxbow & Estabrook Falls
Managing Water on Your Property
What You Can Do
Become a Fresh Coast Guardian
Home HazMat Collection
Water Drop Alert
What Not to Flush
Construction and CAD Standard Documents and Special Bid Attachments
Events & Outreach
Contract Compliance Login
Government & Business
Rules & Regulations
Private Property I & I
Industrial Waste & Pretreatment
Industrial Honor Role
Total Maximum Daily Loads (TMDL)
2050 Facilities Plan
2020 Water Quality Initiative
News and Resources
Blue Notes Sign-Up
Education and Outreach
The following information is being reported to the Wisconsin Department of Natural Resources, regarding sewer overflows the took place last week.
To reduce the risk of basement backups, MMSD initiated a combined sewer overflow on 9-13-19 after intense storms dropped more rain on already saturated ground.
Numerous rain gauges measured 1.5 to 2 inches of rain between midnight and 1:30 a.m. with more rain falling after that time period.
At one point, the Deep Tunnel filled at a rate of 7.5 billion gallons per day, which, if sustained, would have filled the tunnel to its maximum capacity of 432 million gallons in 83 minutes.
The volume of the combined sewer overflow from September 13 and 14, 2019 is estimated at 282 million gallons. An isolated separate sewer overflow also occurred during the storm, estimated at a volume of 41,000 gallons. Further details can be found in the letters below.
With two combined sewer overflows in 2019, MMSD's has captured and cleaned 99% of all the water and wastewater that's entered the regional sewer system.
MMSD’s six-year financial plan calls for investing $1.4 billion into the regional sewer system and water reclamation facilities (including debt service to pay for previous projects).
5-Day CSO Letter
5-Day SSO Letter
Receive Water Drop Alert text message when large storms threaten the area. When a Water Drop Alert has been issued a reminder is sent to use less water until the storm passes.
What do you do when an alert is issued?
Try to use less water until the storm passes.
Help keep water out of your home, reduce water pollution and save money during heavy rains by conducting a home audit, inside and out. Rain Check can help you identify and correct potential problems that could lead to water damage and more. By managing water where it falls, we can all help reduce the risk of basement backups and water pollution.
Get FREE water by the barrel from your roof and use it when it’s dry outside to use in your landscape. Rain barrels help keep excess water out of the sewer system and help reduce water pollution and sewer overflows.