UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2022 Commission File No. 000-27866 374WATER INC. (Exact name of Registrant as specified in its charter) Delaware 88-0271109 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.) 701 W Main Street, Suite 410, Durham, NC 27701 (Address of principal executive off ...