Top list · Worldwide

Wastewater treatment startups worldwide

34 wastewater treatment startups worldwide have raised money in rounds we track. These are the 34 that have raised the most, $288M between them, with the United States the most common home.

$288Mraised by these 34
34on our record in all
United Statesmost common home
ZwitterCoraised the most
  1. 1ZwitterCoZwitterCo is a leader in advanced membrane solutions for industrial and agricultural water treatment, founded in 2018 as a spinout from Tufts University.

    ZwitterCo is a leader in advanced membrane solutions for industrial and agricultural water treatment, founded in 2018 as a spinout from Tufts University.

    Founded 2018Woburn, United States$58Mlast round Oct 2026
  2. 2GradiantGradiant is a Boston-based water treatment technology company founded in 2013 as a spinout from MIT.

    Gradiant is a Boston-based water treatment technology company founded in 2013 as a spinout from MIT.

    Founded 2013Woburn, United States$50Mlast round May 2026
  3. 3Bluewater BioThe UK's fastest growing Water Company, Bluewater Bio is an award-winning specialist in the cost effective treatment of water and wastewater.

    The UK's fastest growing Water Company, Bluewater Bio is an award-winning specialist in the cost effective treatment of water and wastewater.

    Founded 2007London, United Kingdom$38Mlast round Dec 2021
  4. 4CREW CarbonCREW Carbon is a climate technology company founded in 2022 and based in Hamden, Connecticut.

    CREW Carbon is a climate technology company founded in 2022 and based in Hamden, Connecticut.

    Founded -Hamden, United States$30Mlast round May 2026
  5. 5Axine Water TechnologiesAxine Water Technologies is a leader in electrochemical oxidation technology for industrial wastewater treatment, focusing on the effective destruction of persi

    Axine Water Technologies is a leader in electrochemical oxidation technology for industrial wastewater treatment, focusing on the effective destruction of persi

    Founded 2010Vancouver, Canada$21Mlast round Nov 2024
  6. 6Arvia TechnologyArvia Technology is a UK-based company founded in 2007, specializing in industrial wastewater treatment.

    Arvia Technology is a UK-based company founded in 2007, specializing in industrial wastewater treatment.

    Founded 2007Runcorn, United Kingdom$16Mlast round Apr 2015
  7. 7AnAerobicsAnAerobics, a Rochester, N.Y.-based developer of anaerobic wastewater treatment systems.

    AnAerobics, a Rochester, N.Y.-based developer of anaerobic wastewater treatment systems.

    Founded 1999United States$15Mlast round Oct 2002
  8. 8PolyCera MembranesPolyCera Membranes develops membrane technology for industrial wastewater treatment.

    PolyCera Membranes develops membrane technology for industrial wastewater treatment.

    Founded 2017Inglewood, United States$9.0Mlast round Jun 2018
  9. 9cimicoCimico is a biotechnology startup based in San Sebastián, Spain, founded in 2019.

    Cimico is a biotechnology startup based in San Sebastián, Spain, founded in 2019.

    Founded 2021San Sebastian, Spain$7.9Mlast round Jul 2023
  10. 10Shanghai Keysino Separation TechnologyKeysino – To Be The Most Professional Technology And Service Company For Industrial Fluid Treatment And Wastewater Reuse.

    Keysino – To Be The Most Professional Technology And Service Company For Industrial Fluid Treatment And Wastewater Reuse.

    Founded 2011China$7.9Mlast round Nov 2015
  11. 11HydroLeapHydroleap Pte.

    Hydroleap Pte.

    Founded 2016Singapore, Singapore$6.7Mlast round Jul 2025
  12. 12Eco World WaterEco World Water is a clean water tech company that offers wastewater processing through physical and chemical treatment process.

    Eco World Water is a clean water tech company that offers wastewater processing through physical and chemical treatment process.

    Founded -Fort Lauderdale, United States$5.9Mlast round Apr 2026
  13. 13PowerTech WaterPowerTech Water is a wastewater solution company that offers a chemical-free water treatment platform.

    PowerTech Water is a wastewater solution company that offers a chemical-free water treatment platform.

    Founded 2014Lexington, United States$2.8Mlast round Jun 2023
  14. 14MicromidasMicromidas provides microbial biorefinery technology for wastewater treatment.

    Micromidas provides microbial biorefinery technology for wastewater treatment.

    Founded 2008West Sacramento, United States$2.2Mlast round Apr 2010
  15. 15GreywaterGreywater is a specialized technology company in water, wastewater and effluent treatment products.

    Greywater is a specialized technology company in water, wastewater and effluent treatment products.

    Founded 2010Thane, India$2.0Mlast round May 2011
  16. 16NVP EnergyNVP Energy markets energy positive wastewater treatment technology that turns wastewater into a revenue generator.

    NVP Energy markets energy positive wastewater treatment technology that turns wastewater into a revenue generator.

    Founded 2011Galway$1.8Mlast round Jan 2016
  17. 17Green Steel EnvironmentalGreen Steel Environmental is a wastewater treatment company located in Boulder, Colorado.

    Green Steel Environmental is a wastewater treatment company located in Boulder, Colorado.

    Founded 2023Boulder, United States$1.7Mlast round Aug 2025
  18. 18WaterwhelmWaterwhelm is an award-winning company that is commercialising a patent-protected membrane technology for wastewater treatment.

    Waterwhelm is an award-winning company that is commercialising a patent-protected membrane technology for wastewater treatment.

    Founded 2018Edinburgh, United Kingdom$1.5Mlast round Mar 2025
  19. 19Heartland Water TechnologyHeartland Water Technology provides proprietary wastewater treatment technology and services for oil and gas E&P operations.

    Heartland Water Technology provides proprietary wastewater treatment technology and services for oil and gas E&P operations.

    Founded 2008Kirkwood, United States$1.5Mlast round Sept 2026
  20. 20NPHarvestNPHarvest is a company with expertise in organic waste management, wastewater treatment, and nutrient recovery.

    NPHarvest is a company with expertise in organic waste management, wastewater treatment, and nutrient recovery.

    Founded 2023Espoo, Finland$1.4Mlast round Jan 2026
  21. 21NyadNyad is an AI company based in Birmingham, Alabama, founded in 2024.

    Nyad is an AI company based in Birmingham, Alabama, founded in 2024.

    Founded 2024Birmingham, United States$1.3Mlast round Mar 2026
  22. 22Metal MorphMetal Morph is a clean technology company based in London, UK, specializing in circular resource recovery for the water and wastewater sector.

    Metal Morph is a clean technology company based in London, UK, specializing in circular resource recovery for the water and wastewater sector.

    Founded 2025London, United Kingdom$944Klast round Aug 2026
  23. 23MicroHAOPsMicroHAOPs develops wastewater treatment technology with the goal of providing membrane-based treatment processes.

    MicroHAOPs develops wastewater treatment technology with the goal of providing membrane-based treatment processes.

    Founded 2015Seattle$671Klast round Sept 2017
  24. 24Aquagga, Inc.Cleantech / ClimateTech company Ending PFAS 'Forever Chemical' pollution through wastewater treatment and sensing technologies.

    Cleantech / ClimateTech company Ending PFAS 'Forever Chemical' pollution through wastewater treatment and sensing technologies.

    Founded 2019Tacoma, United States$600Klast round Aug 2025
  25. 25AinwaterAInwater is a private company specializing in AI-driven water management technology.

    AInwater is a private company specializing in AI-driven water management technology.

    Founded 2020Santiago, Chile$537Klast round Aug 2024
  26. 26Rise ReformingRise Reforming is a cleantech startup based in Chicago, founded in 2024.

    Rise Reforming is a cleantech startup based in Chicago, founded in 2024.

    Founded 2024Chicago, United States$500Klast round Sept 2026
  27. 27Island Water TechnologiesIWT develops and markets solar-powered wastewater treatment systems for domestic and industrial applications.

    IWT develops and markets solar-powered wastewater treatment systems for domestic and industrial applications.

    Founded 2013Montague, Canada$500Klast round Feb 2018
  28. 28MICROrganic TechnologiesVIVA MFC is a game-changer for wastewater treatment: a drop-in replacement for Aeration systems (both low and high-strength waste).

    VIVA MFC is a game-changer for wastewater treatment: a drop-in replacement for Aeration systems (both low and high-strength waste).

    Founded 2013Troy, United States$430Klast round Sept 2014
  29. 29Clearas Water RecoveryCLEARAS Water Recovery is a provider of wastewater treatment services used to recover contaminants in wastewater.

    CLEARAS Water Recovery is a provider of wastewater treatment services used to recover contaminants in wastewater.

    Founded 2007United States$400Klast round Sept 2014
  30. 30ArbsourceArbsource is developing wastewater treatment systems for the food & beverage industry.

    Arbsource is developing wastewater treatment systems for the food & beverage industry.

    Founded 2011Scottsdale, United States$300Klast round Dec 2014
  31. 31WaiHomeWaiHome is a wastewater research and design company that offers onsite wastewater treatment technology.

    WaiHome is a wastewater research and design company that offers onsite wastewater treatment technology.

    Founded 2021Honolulu, United States$199Klast round Jul 2025
  32. 32Rapid Radicals TechnologyRapid Radicals Technology develops wastewater treatment technology for municipal sewerage districts to address combined sewer overflows.

    Rapid Radicals Technology develops wastewater treatment technology for municipal sewerage districts to address combined sewer overflows.

    Founded 2016Milwaukee, United States$100Klast round Jun 2022
  33. 33HydrOxSysHydroxsys is a clean technology company based in Auckland, New Zealand, founded by engineers and scientists.

    Hydroxsys is a clean technology company based in Auckland, New Zealand, founded by engineers and scientists.

    Founded 2013Auckland, New Zealand$54Klast round Aug 2023
  34. 34Forward Water TechnologiesA new water treatment process to lower costs and reduce the need for wastewater disposal during oil production.

    A new water treatment process to lower costs and reduce the need for wastewater disposal during oil production.

    Founded 2012Mississauga, Canada$6Klast round Nov 2025
Total fundinghow the list is ranked
15 November 2026updated nightly
Rounds we tracksource: Millionrounds

Companies whose own description names this theme, ranked by the total they have raised in rounds we hold. Nobody pays to be on a list.

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