Your Partner in Clean Water

We are more than just a wastewater treatment plant.

For more than 90 years, Madison Metropolitan Sewerage District has worked to protect public health, the environment and our local waters through innovation, sustainability and resource recovery.

Our most requested

COMMISSION

Find meeting materials and meet our Commissioners

Contracting CENTER

Find current business and contracting opportunities with the District

PHONE NUMBERS

Important phone numbers, hours, maps and more

Salt Pile

Be a Salt Saver

Learn how to reduce salt use in your home

CAREERS

Search job opportunities and learn more about our hiring process

District FAQs

Find frequently asked questions and resources here

Video Showcase: Who We Are

Only Flush the 3Ps

Learn about nonflushables
Only Flush the 3Ps

Current Construction Projects

See our projects
Current Construction Projects

Work with Us

Careers
Work with Us

Be Water Softener Smart

Use our softener self-screen tool
Be Water Softener Smart

Take a Virtual Tour

Take the tour
Take a Virtual Tour

Explore our Wildlife Observation Area

Learn more
Explore our Wildlife Observation Area

Upcoming Events

Full Calendar

Latest News

A MMSD Permanent Construction Company crew works to improve the District's treated wastewater on July 24, 1935.

Flow of History: Can wastewater be treated?

History
January 12, 2022
Concerns for odors and health were causing city leaders to look for solutions, but the science of wastewater treatment was still in its infancy.
Maintenance Team using the vacuum excavator trailer behind a truck in front of Headworks.

Suck it up! Vacuum excavator streamlines work

District
December 28, 2021
A vacuum excavator uses suction or pressurized air to clear tough obstructions and speed general maintenance at a wastewater treatment plant.
Young multicultural couple sorting garbage while cleaning their home kitchen and recycling non-flushables.

‘Twas in the pipes…

Culture & Society
December 13, 2021
Twas in the Pipes is an unflushables adventure at the wastewater treatment plant, inspired by the poem 'Twas the Night Before Christmas.
Icy and snowy street with snow, ice, excess salt and salt truck tire tracks on the road.

Walking the talk on winter salt use

District, Pollution Prevention
November 1, 2021
In winter, it is common to see higher levels of chloride arrive at the treatment plant due to salt use on roadways and sidewalks.
Young woman preparing a meal at home, possibly with fats, oils and greases (or FOGs) or in a pan made with PFAS.

PFAS explained: FAQs on manmade chemicals that repel oil and water

Pollution Prevention
October 1, 2021
FAQs on PFAS - once these "forever chemicals" enter the environment, they are difficult to effectively (and inexpensively) remove. 
Historic view of a river leading to Madison lakes with wastewater from outhouses and chamber pots as part of the history of the District.

Flow of history: From outhouses to sewers

History
September 1, 2021
At this time in history, individual outhouses and chamber pots were the standard methods of handling human waste throughout Madison.

Our promise to you

Our Mission

Our Mission


Protect public health and the environment

Our Vision

Our Vision


Enrich life through clean water and resource recovery

Our Ideals

Our Ideals


Equitable, reliable and cooperative