Your Partner in Clean Water
We are more than just a wastewater treatment plant.
For about 100 years, Madison Metropolitan Sewerage District has worked to protect public health, the environment and local waters through service, reliability and sustainability.
Upcoming Events
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Nov 19Commission Meeting (In-Person)8:00 am - 11:00 am
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Dec 9
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Dec 17Commission Meeting (In-Person)8:00 am - 11:00 am
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Jan 14Commission Meeting (In Person)8:00 am - 11:00 am
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Jan 28Commission Meeting (In Person)8:00 am - 11:00 am
MMSDs Unite to Reduce Salt Use
The Madison Metropolitan School District and the Madison Metropolitan Sewerage District partner on two projects to reduce salt use.
District Recognized as a Dane County Climate Champion — Four Times Over
Dane County has recognized the District as one of 73 local entities to earn 2026 Climate Champions status in not one but three categories with four awards.
2025 marks another milestone year for Yahara WINS
Yahara WINS's 2025 annual report shows nine years of phosphorus reduction progress in the Yahara River watershed, with 68,303 pounds of phosphorus kept out of local waterways in 2025 — over 10,000 pounds above target.
Rooted in Partnership: Celebrating the 2025 Metrogro Program
On Wednesday, June 24, Madison Metropolitan Sewerage District welcomed farmers, landowners, and haulers to the Nine Springs Wastewater Treatment Plant for a Metrogro Customer Appreciation event. It was a chance to say thank you in person and also take a moment to step back and look at what the Metrogro program accomplishes, season after season, for our land, our water, and our community.
Contracts and RFP opportunities
Current Construction Projects
What's okay to flush? What's trash?
Reduce salt use at home
Take a plant tour
Work worth doing
Our efforts in pollution prevention
Blending ValvES
How a simple device saves salt use in water softeners
#HardWaterHacks
Find practical tips for living with hard water or water that’s less softened
PFAS
The District is a leader in understanding and addressing PFAS in wastewater
HOUSEHOLD WASTE
Disposing of food items, FOG, chemicals and hazardous waste
Resource REcovery
Recovering and reusing beneficial resources from wastewater
Yahara WINS
A collaborative effort to reduce phosphorus across the watershed
Our promise to you
Our Mission
Protect public health and the environment
Our Vision
Achieve operational excellence and infrastructure renewal to support the needs of the communities and local businesses we serve
Our Values
Service, reliability and sustainability
