X0206 3 2022-06-13 0 0000933972 374Water Inc. SCWO 0001935149 Estes Deanna Rene C/O 374WATER INC. 701 W. MAIN STREET, SUITE 410 DURHAM NC 27701 true false false Common Stock 12780 D Warrant to Purchase Common Stock 2.50 Common Stock 6250 D Option to Purchase Common Stock 3.00 Common Stock 20000 D This warrant was issued on December 17, 2021 in connection with a private placement of the Issuer in which the Reporting Person participated. This warrant Is currently exercisable and expires on December 17, 2024. This option to purchase common stock was granted on June 13, 2022 and vests in four equal quarterly share installments. Reporting Person must be a member of the Board of Directors of the Issuer as of each vesting date. This option expires on June 12, 2032. /s/ Deanna Rene Estes 2022-06-23