Strategic Plan & Performance
GIS Maps and Data
Rain Gauge Data
Blue Notes Newsletter
Blue Notes Newsletter Sign-up
What We Do
Education and Outreach
Milwaukee Estuary AOC Projects
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
Pipe Check Contractor Resources
Industrial Waste & Pretreatment
Industrial Honor Roll
Total Maximum Daily Loads (TMDL)
2050 Facilities Plan
2020 Water Quality Initiative
Record rainfall on May 17, 2020 resulted in sewer overflows to reduce the risk of wastewater backing up into homes and businesses.
Mitchell International Airport measured 2.99” on May 17, the highest total for that day ever recorded.
Even higher totals were recorded around the region with the majority of gauges measuring 4” and 5” from May 17 through 20.
Total overflow volume for the event was 2.1 billion gallons.
Combined Sewer Overflow 2.1 billion gallons.
Separate Sewer Overflow 14 million gallons.
Additional overflows were reported by Bayside, Brookfield, Brown Deer, Cudahy, Elm Grove, Fox Point, Mequon, Milwaukee, River Hills and Shorewood.
The Milwaukee Metropolitan Sewerage District (MMSD) is reporting the following information to the Wisconsin Department of Natural Resources (DNR).