MMSD Central Lab

Every day, a group of dedicated scientists are hard at work in MMSD’s laboratory, testing samples to ensure that the water reclamation facilities are working properly, and to look for sources of pollution and solutions that help protect Lake Michigan.

MMSD has the largest municipal wastewater laboratory in the state. We are recognized in Wisconsin and nationally for our work in developing scientific methods and standards for environmental testing laboratories.

The lab tests a variety of samples for multiple purposes. Besides making sure the reclamation facilities are operating properly, we also sample and test Lake Michigan and our rivers and streams. The lab also tests Milorganite® fertilizer daily before shipping it nationwide to ensure product quality.

Check out what it's like to work in the largest wastewater laboratory in the state of Wisconsin, the MMSD laboratory.

MMSD Green Lab Certification

In 2023, MMSD’s Central Laboratory became one of the nation's first municipal laboratories to earn Green Lab Certification from My Green Lab, the global leader in advancing sustainability in science. In 2025, the lab recertified and successfully achieved My Green Lab Certification as a Platinum-Level Certified Lab.

The My Green Lab Certification program is recognized as the international gold standard for laboratory sustainability, setting benchmarks for best practices that reduce environmental impact while maintaining scientific excellence.

MMSD’s Central Laboratory plays a critical role in everything MMSD does. The lab provides essential analysis to ensure MMSD meets regulatory requirements, serves the public, and guides data-driven decision-making.

These ongoing efforts help ensure that MMSD’s lab continues to set the standard for sustainable science—supporting clean water, public health, and a healthier environment for our region.

Why a Career in Water Quality Protection?

Are you passionate about protecting our water? Water Quality Protection is a vital and rewarding field dedicated to keeping our rivers and Lake Michigan clean and safe.

Explore a Career in the Laboratory