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

Only Flush the 3Ps

Current Construction Projects

Current Construction Projects

Work with Us

Work with Us

Be Water Softener Smart

Be Water Softener Smart

Take a Virtual Tour

Take a Virtual Tour

Explore our Wildlife Observation Area

Explore our Wildlife Observation Area

Upcoming Events

Latest News

A screenshot of the Madison Metropolitan Sewerage District COVID-19 monitoring and wastewater surveillance in Wisconsin.

COVID-19 monitoring in Wisconsin wastewater

January 27, 2022
Wisconsin's COVID-19 monitoring network reports levels of the virus in wastewater and can detect trends in COVID-19 outbreaks.
College student collects water for testing from a pump as a Water Well Sample Intern for our summer Internship.

Summer internships provide valuable opportunities

January 24, 2022
Summer internships are an excellent opportunity for students to gain valuable experiences while making an impact in our local communities.
Salt scattered on a sidewalk to demonstrate winter salt reduction strategies.

Facilities Maintenance team walks the talk on winter salt reduction

January 23, 2022
In winter, salt reduction is serious business. Meeting clean water standards is essential when chloride levels in wastewater rise.
A close-up of the 3.5" hole in the forcemain pipe.

Innovative repair on a Monona force main

January 18, 2022
When a contractor drilled a hole in a District force main pipe under Monona Drive in 2009, what temporary fix and innovative repair was used?
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?

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

December 28, 2021
A vacuum excavator uses suction or pressurized air to clear tough obstructions and speed general maintenance at a wastewater treatment plant.

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