374Water Destroys Over 99.9% of PFAS 'Forever Chemicals' in U.S. Military Destruction Demonstration Project

Rhea-AI Summary

374Water (NASDAQ:SCWO) announced third-party validated results showing AirSCWO permanently destroyed and removed >99.9% of PFAS in four concentrated liquid waste streams and >90% for solid wastes in a U.S. government demonstration led by DIU and ESTCP.

Testing followed EPA Method 1633; hydrogen fluoride stack emissions were non-detectable. Full results were presented at the NEWMOA Science of PFAS Conference on April 16, 2026.

Positive

• AirSCWO achieved >99.9% DRE across four concentrated liquid PFAS streams
• Liquid-stream results included 99.9998% and 99.997% DRE cases
• Hydrogen fluoride stack emissions were non-detectable in all tests
• Testing followed EPA Method 1633 with third-party validation by Arcadis

Negative

• Solid waste DRE was >90%, lower than liquid-stream performance
• One solid waste stream showed aggregate DRE just over 90%, indicating variable efficacy

News Market Reaction – SCWO

+2.90%

1 alert

+2.90% Session close to close

$45.02M Market Cap

0.3x Rel. Volume

In the Apr 30 session, SCWO gained 2.90%, reflecting a moderate positive market reaction.

Data tracked by StockTitan Argus on the day of publication.

Market Context

This announcement details independently validated AirSCWO performance, showing PFAS destruction effi...

Analysis

This announcement details independently validated AirSCWO performance, showing PFAS destruction efficiencies above 99.9% for several concentrated liquid waste streams and greater than 90% for solids, while reporting non‑detectable hydrogen fluoride emissions. It builds on earlier demonstrations and deployments highlighted in recent filings and news. Investors may watch how these results translate into additional contracts, service hubs, and system sales, alongside ongoing capital needs under the existing $100,000,000 shelf registration.

Key Figures

SAFF40 PFAS DRE: 99.9998% Cyclopure PFAS DRE: 99.95% SORBIX PFAS DRE: 99.996% +5 more

8 metrics

SAFF40 PFAS DRE 99.9998% Total PFAS destruction and removal efficiency for Allonnia SAFF40 foam fractionate

Cyclopure PFAS DRE 99.95% Aggregate PFAS DRE for Cyclopure DEXSORB media regenerant still bottoms

SORBIX PFAS DRE 99.996% Aggregate PFAS DRE for SORBIX RePURE IX regenerant still bottoms

AFFF PFAS DRE 99.997% Aggregate PFAS DRE for AFFF C8 & C6 blend waste stream

Spent AIX/GAC DRE Over 97.5% Aggregate PFAS DRE for spent AIX/GAC mixture solid waste

Spent GAC DRE Greater than 90% Aggregate PFAS DRE for spent GAC solid waste stream

Initial PFOS level 75,000,000 nanograms per liter PFOS concentration in firefighting foam before AirSCWO treatment

Final PFOS level Less than 120 parts per trillion PFOS concentration in effluent after AirSCWO treatment

Historical Context

5 past events · Latest: Apr 23 (Positive)

Pattern 5 events

Date	Event	Sentiment	24h Move	Catalyst
Apr 23	Conference schedule update	Positive	-5.3%	Summer conference calendar highlighting AirSCWO projects and PFAS destruction data.
Apr 16	Investor presentation	Positive	-3.5%	New leadership presentation on commercial progress, partnerships and capital plans.
Apr 14	Board reappointment	Positive	+3.5%	Reappointment of experienced director Rick Davis to bolster governance and financing.
Mar 31	Full-year earnings	Negative	+1.8%	2025 results with lower revenue, higher expenses, larger net loss and limited cash.
Mar 19	System deployment	Positive	+5.9%	Readiness of mobile AirSCWO unit for St. Cloud PFAS destruction pilot operations.

24h Move is the share-price change in the day after each event; other market factors may also have contributed.

Pattern Detected

Positive or promotional news has often been met with selling, while operational or deployment milestones have seen more supportive reactions.

Recent Company History

Over the past several months, 374Water has highlighted AirSCWO commercialization and governance changes. On Mar 19, a mobile AirSCWO deployment to St. Cloud for PFAS destruction pilots saw shares rise 5.86%. Full-year 2025 results on Mar 31 showed revenue of $0.2M and a $21.0M net loss, yet the stock gained modestly. Subsequent governance and investor updates in April, including a new presentation and conference schedule, were followed by single‑digit percentage declines.

Key Terms

pfas, aqueous film forming foam, epa method 1633, hydrogen fluoride, +4 more

8 terms

pfas medical

"The independently validated results demonstrate that AirSCWO achieved greater than 99.9% destruction and removal efficiency ("DRE") across all four highly concentrated PFAS liquid waste streams"

PFAS are a group of human-made chemicals used in many everyday products, such as non-stick cookware, water-repellent clothing, and food packaging, because they resist heat, water, and grease. They are often called "forever chemicals" because they do not break down easily in the environment or the human body, potentially leading to health concerns. For investors, the presence of PFAS-related risks can impact companies’ reputations, legal liabilities, and future costs.

aqueous film forming foam technical

"AFFF (Aqueous Film Forming Foam; C8 & C6 Blend) - Aggregate PFAS DRE of 99.997%"

Aqueous film forming foam (AFFF) is a liquid firefighting agent that spreads across flammable liquid surfaces to smother and cool fires, like putting a breathable blanket over a spill to stop flames. It matters to investors because many formulations contain long-lasting chemicals linked to environmental contamination and health risks, creating potential cleanup costs, legal liabilities, regulatory bans, and shifts in demand toward safer alternatives.

epa method 1633 regulatory

"All testing followed EPA Method 1633 for liquid-phase PFAS analysis, with supplemental air emissions monitoring"

EPA Method 1633 is a standardized government laboratory procedure for detecting and measuring per- and polyfluoroalkyl substances (PFAS), a group of persistent industrial chemicals, in environmental samples using advanced analytical instruments. Investors care because the method provides the reliable, legally recognized test results regulators and courts use to determine contamination, cleanup needs, liability, and compliance costs—similar to an agreed-upon ruler used to settle disputes over property boundaries.

hydrogen fluoride medical

"Critically, hydrogen fluoride stack emissions were non-detectable across all six tests"

Hydrogen fluoride is a highly reactive chemical that can exist as a gas or liquid and quickly damages skin, metal and glass; think of it like an extremely strong cleaning agent that will eat through many materials. It matters to investors because it is a critical input in industries such as semiconductor manufacturing, oil refining and chemical production, so its availability, price, safety rules and accident risks can affect costs, operations and regulatory liabilities for companies.

parts per trillion technical

"down to less than 120 parts per trillion (less than the reporting limit)"

Parts per trillion (ppt) is a unit that measures extremely tiny concentrations: one part out of one trillion equal parts. To visualize it, ppt is like a single second in about 31,700 years, or a single drop in a vast volume of water, and it’s used to report trace amounts of chemicals, pollutants, or contaminants. Investors care because ppt-level differences can affect regulatory compliance, liability, cleanup costs, product safety, and a company’s reputation, all of which can influence valuation and risk.

nanograms per liter technical

"reduce 75,000,000 nanograms per liter of PFOS in firefighting foam down to less than 120 parts per trillion"

Nanograms per liter (ng/L) is a unit that measures how many billionths of a gram of a substance are dissolved in one liter of liquid. For investors, ng/L matters because regulators, safety tests, and product quality standards often hinge on these extremely small concentrations; tiny differences can trigger compliance actions, affect manufacturing costs, or limit market access, much like a single speck changing whether a product passes inspection.

destruction and removal efficiency regulatory

"achieved greater than 99.9% destruction and removal efficiency ("DRE") across all four highly concentrated PFAS liquid waste streams"

Destruction and removal efficiency measures how effectively a treatment or combustion system eliminates a specific pollutant from a waste stream, expressed as the percent destroyed or removed. Think of it like a shredder that both breaks items apart and takes them out of circulation: higher percentages mean fewer harmful contaminants escape. For investors, DRE indicates regulatory compliance, operating performance, and potential liability or cleanup costs tied to environmental controls.

stack emissions technical

"hydrogen fluoride stack emissions were non-detectable across all six tests"

Stack emissions are the gases, particles and other pollutants released into the air from a facility’s smokestack or chimney, similar to the visible smoke coming from a home's furnace but from industrial equipment. Investors care because these releases affect a company’s regulatory compliance, potential fines, clean-up costs and public reputation, and may require expensive pollution controls or changes to operations that influence future profits and asset values.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Third-Party Test Results Presented by ARCADIS Confirm Greater Than 99.9% Destruction and Removal Efficiency for Concentrated PFAS Wastes

MORRISVILLE, NC / ACCESS Newswire / April 30, 2026 / 374Water Inc. (NASDAQ:SCWO) ("374Water" or the "Company"), a leading cleantech and environmental services company, today announced the public release of U.S. government PFAS destruction test results using AirSCWO^™. The results come from 374Water's participation in an official project led by the US government's Defense Innovation Unit ("DIU") and the Environmental Security Technology Certification Program ("ESTCP").

AirSCWO Destroys PFAS - Permanently

Unlike conventional treatment approaches that filter or concentrate PFAS, AirSCWO permanently destroys organic contaminants. Results were evaluated by a third party and presented by Arcadis, a global leader in environmental engineering, which served as the Company's independent project partner.

"Performing technical demonstrations at scale, such as this DIU project, are essential to build trust within government agencies," said Howard Teicher, the Company's VP, Government. "Watching AirSCWO PFAS-contaminated waste streams, in some cases to a NON-DETECT or single-parts per trillion level, affirms that this technology is ready for operational use."

AirSCWO was evaluated with six distinct PFAS-contaminated waste streams and met or exceeded every key performance objective. Results were evaluated by a third party and presented by Arcadis, a global leader in environmental engineering, which served as the Company's independent project partner. These wastes are the types of concentrated, hard-to-treat waste streams generated at military bases, industrial facilities, and municipal water systems nationwide. The independently validated results demonstrate that AirSCWO achieved greater than 99.9% destruction and removal efficiency ("DRE") across all four highly concentrated PFAS liquid waste streams, and greater than 90% DRE for solid waste streams:

• Allonnia SAFF40 Foam Fractionate - Total PFAS DRE of 99.9998%, with effluent concentrations at or below method detection limits across all primary analytes

• Cyclopure DEXSORB Media Regenerant Still Bottoms - Aggregate PFAS DRE of 99.95%, exceeding 99.99% for PFOS, PFOA, PFHxS, and 6:2 FTS

• ECT2 SORBIX RePURE IX Regenerant Still Bottoms - Aggregate PFAS DRE of 99.996%

• AFFF (Aqueous Film Forming Foam; C8 & C6 Blend) - Aggregate PFAS DRE of 99.997%, exceeding 99.999% for PFOS, PFOA, and 6:2 FTS

• Spent AIX/GAC Mixture - Over 97.5% aggregate PFAS DRE, exceeding 99.5% for PFOS and PFOA

• Spent GAC - Aggregate PFAS DRE greater than 90%, exceeding 99.9% for PFOS and PFOA

All testing followed EPA Method 1633 for liquid-phase PFAS analysis, with supplemental air emissions monitoring conducted via multiple validated federal methods. Critically, hydrogen fluoride stack emissions were non-detectable across all six tests - confirming that AirSCWO fully mineralizes these highly recalcitrant fluorinated organic compounds with no hazardous air emissions.

"These results represent a defining moment for AirSCWO and for the PFAS destruction market as a whole," said Dr. Raj Melkote, Chief Technology Officer for 374Water Inc. "What Arcadis and Clean Earth helped us demonstrate is not just that AirSCWO works - it's that it works across the hardest waste streams, under the most rigorous federal protocols, with third-party analytical data that leaves no room for ambiguity. That we can reduce 75,000,000 nanograms per liter of PFOS in firefighting foam down to less than 120 parts per trillion (less than the reporting limit) is not a theoretical laboratory result. It represents full-scale performance, independently verified, with real-world scenarios and at the exact conditions the market demands. We expect to see the industry respond strongly to this data."

A Large and Growing Market Opportunity

The PFAS problem spans virtually every segment of the water and waste management industry from military installations remediating impacted soil and groundwater, to municipal utilities facing costly biosolids disposal constraints, to landfill operators handling billions of gallons of PFAS-laden leachate each year. Regulatory pressure to move beyond conventional approaches toward permanent destruction solutions is accelerating rapidly, driven by tightening federal and state discharge limits, liability uncertainty and public health concerns.

Importantly, conventional technologies don't destroy PFAS - they concentrate it, creating a residual waste problem that still needs to be solved. AirSCWO is the final step in that treatment chain: receiving the concentrated PFAS residuals that other technologies produce and permanently destroying them and thus eliminating all long-term risks associated with these wastes.

The full results were publicly presented at the Northeast Waste Management Officials Association ("NEWMOA") Science of PFAS Conference on April 16, 2026, by Baxter Miatke, PE, PFAS Treatment Technology Lead at Arcadis, and Lauren March, PE, PFAS Destruction Subject Matter Expert at Arcadis.

374Water will be sharing these results and discussing SCWO applications at its upcoming conference appearances.

About 374Water
374Water Inc. (NASDAQ:SCWO) is a leading cleantech and environmental services company developing supercritical water oxidation technology for the destruction of organic waste streams 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 follow 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. 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 374Water's control. These forward-looking statements are subject to risks and uncertainties, including those discussed under "Risk Factors" in 374Water's Form 10-K for the year ended December 31, 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.

View the original press release on ACCESS Newswire

FAQ

What did 374Water (SCWO) report about PFAS destruction in April 2026?

AirSCWO permanently destroyed PFAS with >99.9% DRE for four concentrated liquids and >90% for solids. According to the company, Arcadis-presented, third-party-validated testing followed EPA Method 1633 and included nondetect hydrogen fluoride stack emissions.

Which PFAS waste streams did SCWO test in the U.S. government project?

The project tested six distinct PFAS-contaminated waste streams, including firefighting foam and spent GAC/AIX mixtures. According to the company, results covered concentrated liquids and solids typical of military and municipal wastes.

How were AirSCWO emissions monitored during the April 2026 demonstration?

Air emissions were monitored with multiple validated federal methods and showed nondetect hydrogen fluoride. According to the company, supplemental air monitoring accompanied EPA Method 1633 liquid-phase PFAS analysis for each test.

What specific destruction figures did 374Water report for firefighting foam?

AFFF (C8&C6 blend) showed an aggregate PFAS DRE of 99.997%, with some analytes above 99.999%. According to the company, Arcadis-presented data showed effluent concentrations at or below method detection limits.

Where and when were the AirSCWO PFAS results presented publicly?

Full results were presented at the NEWMOA Science of PFAS Conference on April 16, 2026. According to the company, Arcadis experts publicly presented the third-party-validated data at that conference.