Wastewater treatment isn’t exactly the stuff of cocktail party chatter, unless you’re talking about Green Steel Environmental. Then it’s less “pass the cheese plate” and more “wait, they do what with steel slag?” This Boulder-based clean tech player just pulled in $1.7 million as part of a $2.6 million clean-tech investment push, led in part by Central Texas Angel Network with Cowtown Angels and a roster of strategic partners jumping in. It is not their first vote of confidence, Colorado’s OEDIT already cut a $250,000 check for their biogas scrubbing tech, bringing total confirmed funding to at least $1.95 million.
Green Steel Environmental’s origin story isn’t a garage-and-grit cliché. It’s a deep-tech spinout from the University of Colorado Boulder, born in the Environmental Engineering Laboratory under Professor Mark Hernandez. The company licensed patented and patent-pending tech through CU’s Embark Deep Tech Startup Creator, turning lab work into market-ready environmental weapons. Leading the charge is CEO and co-founder Jon Teaford, an entrepreneur and Executive in Residence at Embark, paired with COO and co-founder Jon Jonis, a mechanical engineer with a 15-year global track record in gas treatment manufacturing. The roster recently leveled up with Chief Commercial Officer Ron Zighelboim, bringing decades of experience in resource recovery and wastewater to the mix.
The pitch is disarmingly simple: take steel slag, industrial waste from steel manufacturing, and upcycle it into Green Steel PSR, a sustainable additive that pulls phosphorus and sulfur from wastewater and biogas before they turn into environmental headaches. For digester operators, it means up to 80 percent sulfur removal without capital expenditures. For municipalities and dairies, it means ditching hazardous chemicals like ferric chloride. And because the material settles into biosolids that can be used as fertilizer, the process closes a loop most industries still leave wide open.
They are not chasing a niche. The U.S. treats 30 billion gallons of wastewater a day, much of it with chemicals that leave a mark. The phosphorus removal market alone is a multi-billion-dollar playground, and Green Steel Environmental is aiming for the sweet spot where cost, sustainability, and scalability intersect. Add in a patent-pending biogas scrubbing platform for renewable natural gas production, and you start to see why investors are paying attention.
This funding fuels expansion, more conferences like WefTec, deeper industry partnerships, sales engineering hires, and scaling tech that could help deliver 270 billion kilowatt-hours of renewable electricity and 35 billion gallons of clean water daily. It is not about going green because it is trendy. It is about building a circular economy that turns industrial byproducts into environmental solutions and proving that waste, in the right hands, can be worth more than gold.
