374Water Inc.

Disclosure Controls and Procedures

The Company, under the supervision and with the participation of the Company’s management, including our Chief Executive Officer and Chief Financial Officer, have evaluated the effectiveness of the design and operation of the Company’s “disclosure controls and procedures” (as defined in Rule 13a-15(e)) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) as of the end of the period covered by this report. Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that the Company’s disclosure controls and procedures were not effective due to the identified material weakness in the Company’s internal controls over financial reporting caused by the lack of full-time resources in our finance and accounting department. As a result of the identified material weakness, we are working to establish a remediation plan, which includes additional full-time personnel with the necessary skills and expertise to enhance the Company’s financial and accounting resources and control environment.

Because of its inherent limitations, a system of internal control over financial reporting can provide only reasonable assurance of such reliability and may not prevent or detect misstatements. Also, projection of any evaluation of effectiveness to future periods is subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Changes in Internal Control Over Financial Reporting

There were no changes in our internal control over financial reporting during the three months ended June 30, 2026 that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.