Crew Carbon Raises $25 Million to Scale Wastewater-Integrated Carbon Removal

Connecticut-based startup Crew Carbon has raised $25 million in a Series A round to expand its technology that integrates carbon removal into existing wastewater treatment facilities through accelerated mineral weathering. The raise includes $19 million in equity and $6 million in grants and non-dilutive funding.

Founded in 2022 as a Yale University spinout, Crew Carbon introduces alkaline minerals such as calcium carbonate into wastewater treatment systems to accelerate natural mineral weathering processes that permanently store atmospheric CO2. The approach improves biological treatment performance and removes CO2 without requiring new facilities or extensive permitting. The technology has been deployed at nearly 10 wastewater treatment facilities across the US and Europe, including with the Hampton Roads Sanitation District. The company has also secured more than $33 million in carbon removal offtake agreements, with verified credits delivered to JPMorganChase, Google, Autodesk and Stripe through Frontier.

The wastewater treatment industry faces growing pressure from tighter environmental regulations, rising volumes and ageing infrastructure, creating demand for solutions that enhance capacity without large capital expenditure. Crew Carbon's model is differentiated in the carbon removal market by its integration into existing industrial infrastructure, bypassing the need for standalone capture facilities and the permitting complexity they entail. Its permanent, measurable carbon removal credentials—based on verifiable geochemical processes—give corporate buyers confidence in the quality of the credits they are purchasing.

Proceeds from the Series A will be used to create partnerships with additional wastewater utilities, expand management capacity and scale commercial operations. The round was led by Burnt Island Ventures, with participation from AP Ventures, Sony Innovation Fund, Builders Vision, Kibo Invest, Idemitsu Ventures, New York Ventures and several family office investors, alongside existing backers. As pressure mounts on utilities to modernise ageing infrastructure while meeting carbon reduction targets, Crew Carbon is positioning itself to become a category leader at the intersection of water treatment and permanent carbon removal.

Key figure — $33 million in carbon removal offtake agreements secured to date