Freeflow
Freeflow Ventures is an early-stage, deep-tech venture capital firm in Pasadena, California that turns university science from Caltech, JPL, Berkeley and UCSF into companies in human and planetary health. Water is one slice of that thesis: as of 2026 Freeflow has backed two water companies across four tracked deals.
Compiled by Antoine Walter, (don't) Waste Water, from official filings and direct intelligence in Leviathan.
The take
Freeflow Ventures is a deep-tech fund that goes shopping in the laboratory. From Pasadena, a short walk from Caltech and NASA's Jet Propulsion Laboratory, Freeflow writes first cheques into companies spun out of university science at Caltech, Berkeley and UCSF, the kind started by Nobel laureates and career researchers rather than by repeat software founders. Its whole thesis is human and planetary health, and water sits inside the planetary half, alongside energy, carbon capture and robotics.
Freeflow keeps surfacing in a water search, which can feel like a surprise, because Freeflow is a science fund and water is simply what its net sometimes catches. Its two tracked water bets are both hard-science plays: Membrion, a Seattle company whose ceramic ion-exchange membranes pull salt and metals out of industrial and semiconductor wastewater, and Hydrosat, which flies thermal-infrared cameras on satellites to read crop water stress and drought from orbit. One cleans water on the ground; the other measures it from space.
Freeflow's pattern is the deep-tech bet placed early, from Seed to Series B, usually riding alongside other investors rather than out in front, and it leads few of its rounds. Two water companies across four deals is a modest water footprint by design, which is why (don't) Waste Water rates Freeflow's water commitment Occasional. Freeflow is, in my tracking, one of the clearer cases of a science fund that water founders keep bumping into without it ever being a water fund. For a newcomer the read is simple: if you want a fund that lives and breathes water, look elsewhere; if you want to see where frontier science quietly runs into water, Freeflow is a useful map.
Water Commitment Score
Compiled from official filings, third-party records, and direct intelligence from investors and founders, in Leviathan · recomputed monthly · as of Jun 2026.
How they invest
Portfolio · 2 water companies
Invests alongside
Highlighted = profiled on (don't) Waste Water.
Frequently asked
- What does Freeflow Ventures invest in?
- Freeflow Ventures invests in early-stage deep-tech companies built on university science, spanning human and planetary health: drug discovery, diagnostics, robotics, energy, carbon capture and water. Freeflow writes first cheques into founders coming out of Caltech, JPL, UC Berkeley and UCSF, often pairing breakthrough research with AI and machine learning.
- What water companies has Freeflow Ventures backed?
- Freeflow Ventures has backed two water companies that (don't) Waste Water tracks: Membrion, a Seattle maker of ceramic ion-exchange membranes that strip salt and metals from industrial and semiconductor wastewater, and Hydrosat, which uses thermal-infrared satellite imagery to monitor crop water stress, drought and food security from orbit.
- Who runs Freeflow Ventures?
- Freeflow Ventures is led by managing partners David Fleck, its founder, and Kevin Barrett, who between them bring decades across technology, finance, life sciences and healthcare. Steve Roy serves as operating partner. The firm leans on advisers and a scientific board tied to Caltech, Berkeley and UCSF.
- Where is Freeflow Ventures based?
- Freeflow Ventures is based in Pasadena, California, beside Caltech and NASA's Jet Propulsion Laboratory, the research ecosystems many of its founders come from. Freeflow also sources companies from UC Berkeley and UCSF, and invests in early-stage deep-tech startups across the United States.
- Is Freeflow Ventures the same as FreeFlow or Freeflow Pipesystems?
- No. Freeflow Ventures is the Pasadena, California venture-capital firm founded in 2019 that backs deep-tech science companies. It is unrelated to the various operating companies that share the name, such as FreeFlow Technologies or Freeflow Pipesystems. On (don't) Waste Water, Freeflow refers only to the venture fund.