On January 16, 2026, the Madison Metropolitan Sewerage District announced the first issuance of 24,143 verified carbon credits under a new Regen Registry methodology for watershed-based infrastructure alternatives—a milestone for the intersection of water quality and climate finance.
Rather than constructing energy-intensive treatment systems costing $78–$124 million, the District implemented the Yahara WINS (Watershed Improvement Network) program across 139,000 hectares of the Yahara Watershed in Wisconsin. The initiative unites municipalities, conservation groups, and farmers to deploy field-level practices like cover crops, wetland restoration, and reduced tillage that cut phosphorus runoff while avoiding greenhouse gas emissions.
Over a 20-year crediting period (2017–2036), the project is projected to avoid approximately 73,463 tonnes of CO₂e. This demonstrates how utilities can achieve Clean Water Act compliance while generating verified climate benefits—creating a replicable model for other US water systems seeking climate-aligned regulatory approaches.
“Carbon finance has finally reached a point where it can meaningfully reduce the cost burden on ratepayers while supporting long-term ecological benefits.”
Yahara WINS launched as a four-year pilot project to test watershed adaptive management as an alternative to traditional treatment upgrades.
Transitioned from pilot to full 20-year implementation across the 536 square mile Yahara Watershed, engaging 30+ municipal stakeholders.
24,143 verified carbon credits issued under new Regen Registry watershed methodology. Water Environment Federation purchased 1,000 credits.
The Water Environment Federation purchased 1,000 credits and designated the Madison Metropolitan Sewerage District as the official climate partner for WEFTEC 2026—the world’s largest water quality conference.
M.A. Mortenson Companies acquired and retired credits as part of a 2023 pre-sale agreement to address operational emissions, demonstrating corporate demand for high-quality watershed carbon credits.