CREW Carbon, a New Haven-based developer of wastewater treatment process intensification technology, has raised $25M in an oversubscribed Series A funding round led by Burnt Island Ventures. The company doses calcium carbonate to boost alkalinity, enhancing biological nutrient removal, settleability, and CO2 sequestration as stable bicarbonates. The capital, including $19M equity and $6M non-dilutive, will scale deployments across U.S. utilities and expand carbon removal offtakes.
Wastewater CDR Attracts Specialist Capital
The raise aligns with surging interest in wastewater-integrated carbon removal. Prithu recently secured $1.1M seed funding for nature-based CDR, while U.S. DOE allocated $45M for CDR R&D. CREW Carbon's approach leverages existing plants for dual operational savings and verified removals, differentiating from soil-focused enhanced rock weathering peers like Lithos Carbon.
Alkalinity Limits Strangle Treatment Efficiency
Wastewater plants face alkalinity shortages that disrupt biological processes, forcing reliance on hazardous chemicals like caustic soda. These add costs, safety risks, and carbon footprints. Operators struggle with inconsistent nutrient removal and poor sludge settleability, risking permit violations amid tightening regulations. Legacy upgrades demand massive capex, as seen in Hampton Roads' potential $400M deferral.
Limestone Dosing Unlocks Dual Benefits
CREW Carbon's Alkalinity-Enhanced Mode™ uses soluble limestone to stabilize pH without new infrastructure. This accelerates enhanced weathering, converting dissolved CO2 into permanent bicarbonates while improving effluent quality. Real-time sensors enable precise MRV via the Isometric WAE protocol. Deployments at 10+ sites, including HRSD's 10MGD plant, demonstrate 10-45MGD capacity.
As Tom Ferguson of Burnt Island Ventures noted:
"CREW's water technology is driving jaw-dropping results."
Water VCs Lead Oversubscribed Round
Burnt Island Ventures, with exits like Valor Water Analytics to Xylem, led due to CREW's wastewater fit alongside portfolio like SewerAI. Sony Innovation Fund praised the geochemistry for infrastructure integration, while Counteract continued CDR backing. Builders Vision and AP Ventures joined, signaling conviction in scalable, cost-saving climate tech. This mix validates CREW's $33M offtake pipeline with Frontier and others.
CDR Market Scales Amid Policy Boosts
The carbon dioxide removal market stands at $967M in 2026, growing at 14.17% CAGR to 2035. Germany opened €5B CCfD to CDR, complementing U.S. tailwinds. CREW positions wastewater—50,000+ global plants—as untapped gigaton-scale CDR hubs.
Yale Spinout Drives Domain Expertise
As a Yale University spinout, CREW Carbon draws from geochemistry leaders like advisors Peter Raymond and Noah Planavsky. CEO Dr. Joachim Katchinoff leads with wastewater optimization focus. Recent hires like Senior Scientist Chris Reinhard bolster biological treatment R&D amid +10 utility pilots.
Utility Deployments Fuel National Expansion
Post-raise, CREW eyes broader rollouts with HRSD at two Virginia plants and South Platte Renew serving 300k residents. A $2.35M Colorado grant supports demos, while hiring for Head of Process Technology signals R&D acceleration. $32M offtakes and 72K tons CO2 contracted position verified credits for buyers like Google.