Olathe Deployment Advances as 374Water Accelerates Its Mission to Eliminate PFAS and Organic Wastes

MORRISVILLE, NC / ACCESS Newswire / March 12, 2026 / 374Water Inc. (NASDAQ: SCWO) ("374Water" or the "Company"), a global leader in organic waste destruction technology for industrial, municipal, and federal markets, today announced that it has received the Purchase Order ("PO") from Garney Construction ("Garney"), a national leader in water and wastewater treatment plants and infrastructure projects, which was selected by the City to lead construction and integration activities.

The Purchase Order is a critical commercial milestone, triggering the issuance of a $2.3M invoice and payment to 374Water, and activating the next phase of a project that positions Garney, the City of Olathe, and 374Water to advance the Company's proven and scalable solution for the safe and permanent destruction of PFAS-contaminated biosolids.

"Receiving this Purchase Order from Garney Construction is a significant step forward - it signals that the Olathe project is fully in motion and that our technology is being put to work solving one of the most critical waste management challenges," said Sunny Viswanathan, Vice President of Solutions at 374Water. "The PFAS crisis is forcing municipalities to change their practices from the status quo to destruction, and 374Water is uniquely positioned to provide municipalities with a permanent, proven solution. Olathe represents exactly the kind of high-impact deployment that we believe will catalyze broader adoption of AirSCWO technology across markets."

Per- and polyfluoroalkyl substances ("PFAS"), known widely as "forever chemicals" - have become one of the most pressing regulatory and public health challenges facing municipal wastewater treatment operators today. Municipalities are undergoing regulatory and environmental pressure for technologies capable of permanently destroying PFAS, according to analysis from the U.S. EPA.

The City of Olathe's deployment represents the technology's growing commercial momentum as municipalities seek a sustainable alternative to traditional management practices, including land application, incineration and landfill disposal.

About 374Water

374Water Inc. (NASDAQ: SCWO) is a global industrial technology and services company providing innovative solutions addressing wastewater treatment and waste management issues within the industrial, municipal, and federal markets. 374Water's AirSCWO technology is designed to efficiently destroy and mineralize a broad spectrum of nonhazardous and hazardous organic wastes, producing safe dischargeable water streams, safe mineral effluent, safe vent gas, and recoverable heat energy. 374Water's AirSCWO technology has the potential to assist its customers to meet discharge requirements, reduce or eliminate disposal costs, remove bottlenecks, and reduce litigation and other risks. 374Water continues to be a leader in innovative waste treatment solutions, dedicated to creating a greener future and eradicating harmful pollutants. Learn more by visiting www.374water.com and following us on LinkedIn.

Forward-Looking Statements

Certain statements in this communication are "forward-looking statements" within the meaning of the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995, as amended. Words such as "anticipate," "believe," "confidence," "could," "design," "estimate," "expect," "intend," "may," "plan," "predict," "project," "potential," or other comparable terminology are intended to identify forward-looking statements. These statements include 374Water's belief that Olathe represents exactly the kind of high-impact deployment will catalyze broader adoption of AirSCWO technology across markets. 374Water has based these forward-looking statements on its current expectations, assumptions, estimates, beliefs, and projections. While 374Water believes these expectations, assumptions, estimates, and projections are reasonable, such forward-looking statements are only predictions and involve known and unknown risks and uncertainties, many of which involve factors or circumstances that are beyond the 374Water's control. These forward-looking statements are subject to risks and uncertainties, including those discussed under "Risk Factors" in 374Water's Form 10-Q for the quarter ended September 30, 2025, and in 374Water's subsequent filings and reports with the SEC. The forward-looking statements herein are made only as of the date they were first issued, and unless otherwise required by laws, 374Water disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events, or otherwise.

Investor Relations Contact

Belton Copp
Vice President
Direct: 401-419-1545
Belton.Copp@374water.com
www.374Water.com

SOURCE: 374Water Inc.