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When heavy rain threatens the Milwaukee area, stormwater increases the water sent to the Milwaukee Metropolitan Sewerage District (MMSD) water reclamation facilities.
When too much rain gets into the sanitary sewer system, preventing sewage from backing up into your basement and protecting the environment are our highest priorities.
MMSD has captured and cleaned 98.5% of all the stormwater and wastewater entering the regional sewer system since 1994. Before the Deep Tunnels, our region polluted our waterways with 50-60 sewer overflows yearly, and now we average two.
Facility Capacity Information
Want to see how much rain we've had in the last two or three weeks?
Get helpful alerts during heavy rainfalls & help do your part, in using less water to help with overflows in your area.
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 until the rain passes.
What do you do when an alert is issued?
The MMSD Deep Tunnels have prevented more than 145.2 billion gallons of pollution from getting into Lake Michigan. Thanks to the deep tunnels and many other improvements, MMSD has captured and cleaned 98.5% of all the water and wastewater that's entered the regional sewer system since 1994.
CURRENT STORAGE 71 million gallons
MAX CAPACITY 432 million gallons
As of 4/1/23, 3:30 AM
CURRENT STORAGE 0 million gallons
MAX CAPACITY 89 million gallons
MMSD runs two water reclamation facilities, Jones Island and South Shore, that clean residential and industrial wastewater for 28 communities with approximately 1.1 million people in the Milwaukee area.
CURRENTLY TREATING 227 million gallons / day
MAX CAPACITY 300 million gallons / day
CURRENTLY TREATING 251 million gallons / day
MAX CAPACITY 330 million gallons / day
MMSD is committed to protecting our community and the environment for a healthier, cleaner, resilient region. MMSD has captured and cleaned 98.5%
of all the water that's entered the regional sewer system since 1994. Learn how MMSD's water reclamation facilities clean our water.
Environmental Protection Agency (EPA)
85% Water cleaned & captured
MMSD's status since 1994 to today
98.5% Water cleaned & captured
This page is automatically updated. The data have not been verified and may contain errors. As data are verified, MMSD reserves the right to make corrections to values as necessary. MMSD is providing this data as is and the user assumes the entire risk of use of this data.
Please call your municipal public works department to report water in your basement, and fill out our Reporting a Wet Basement form. A copy of the form will be shared with your municipality.
To learn more about what could be causing the water, visit our Water in My Basement page.
Managing water on your property can significantly reduce your chances of having a wet basement.
Learn about your basement's laterals, foundation drains, and other issues that could be causing your basement to flood.
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