U.S. Army Corps of Engineers Validates 374Water's AirSCWO(TM) Technology at 99.9993% PFAS Destruction in Report on AFFF Treatment

Independently validated USACE Engineer Research and Development Center ("ERDC") demonstration - conducted with Arcadis - confirms permanent destruction of PFAS in aqueous film-forming foam ("AFFF"), with treated liquid effluent below U.S. EPA drinking water limits and near-zero fluorinated stack emissions.

MORRISVILLE, NC / ACCESS Newswire / July 24, 2026 / 374Water Inc. (NASDAQ:SCWO) ("374Water" or the "Company"), a cleantech and environmental services company deploying supercritical water oxidation technology for the permanent destruction of PFAS and hazardous organic waste streams, today announced the public release of a U.S. Army ERDC technical report documenting an independently validated demonstration of the Company's AirSCWO™ technology destroying PFAS in AFFF. The demonstration was conducted with Arcadis U.S., Inc. ("Arcadis"), which co-authored the report and independently validated the results. 374Water's AirSCWO system treated AFFF concentrate at the Company's Waste Destruction Facility "WDS" in Orlando, Florida. Performance was evaluated across three objectives: PFAS destruction efficiency, PFAS in gaseous stack emissions, and treatment operating data. Liquid effluent and direct gas-stack sampling were conducted using certified U.S. EPA methods - including EPA Method 1633, the Total Oxidizable Precursor ("TOP") Assay, and OTM-45 and OTM-50 for stack emissions - with analyses performed and cross-validated by multiple independent laboratories, including ERDC, the Colorado School of Mines, and Eurofins.