MMSD in Wisconsin First to Generate Verified Carbon Credits for Watershed Water Quality Compliance

The Madison Metropolitan Sewerage District (MMSD) has become the first U.S. entity to create verified carbon credits linked to water quality compliance through its Yahara Watershed Improvement Network project. In January 2026, Regen Registry issued 24,143 verified credits under this initiative, which addresses phosphorus pollution economically by implementing nature-based management practices. The project aims to avoid 73,463 metric tons of CO2 equivalent over 20 years and is projected to earn approximately $270,000 by 2036.

Published Mar 20, 2026

The Madison Metropolitan Sewerage District (MMSD) in Wisconsin has generated verified carbon credits linked to watershed-scale water quality compliance, marking a new category in carbon markets. In January 2026, 24,143 verified credits were issued for the Yahara Watershed Improvement Network (Yahara WINS), which addresses phosphorus pollution through a collaborative, nature-based approach instead of costly infrastructure.

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Launched in 2012 and fully implemented in 2017, the initiative involves various stakeholders implementing practices like cover crops to reduce runoff. The project is expected to avoid 73,463 metric tons of CO2 equivalent over 20 years, yielding around $270,000 in revenue through 2036.