graphic of mmsd and city sewer lines



sewer system underneath a house

If you own a house, you own part of the sanitary sewer system that helps protect public health. The section you own is called a lateral and it connects to the sewer system owned by your city or village.


Account for 3,000 miles of sanitary sewer pipe in the MMSD service area. They transport all the water you use in your home out to the street where it drains into the sewer system your city or village owns.

Do you have issues with your lateral? Please contact us.

City and Village Sanitary Sewers:

Make up another 3,000 miles of sewer pipe in the region. MMSD serves 28 communities that all own and operate sanitary sewer systems.

MMSD Sewers:

About 300 miles of regional sewer pipes that transport wastewater to one of two water reclamation facilities where the water is cleaned and returned to Lake Michigan.

We also have the Deep Tunnel system, which is 28-miles long and ranges in size from 17 feet to 32 feet in diameter.

More Info on the Deep Tunnel

Sewer construction: installing new MMSD regional sewers on 2nd St. in Milwaukee