X0609 4 2026-07-01 0000933972 374Water Inc. SCWO 0002107970 Weiser Charles Maurice false C/O 374WATER INC. 100 SOUTHCENTER COURT SUITE 200 MORRISVILLE NC 27560 true true false false Chief Financial Officer false Stock Option (right to buy) 2.16 2026-07-01 4 A false 150000 0 A 2026-07-01 2036-07-01 Common Stock 150000 150000 D Restricted Stock Units 0 2026-07-01 4 A false 125000 0 A 2026-07-01 2029-07-01 Common Stock 125000 125000 D The stock option was granted pursuant to the 374Water Inc. 2021 Equity Incentive Plan, as amended. The option vests as follows: 25% (37,500 shares) on the grant date (July 1, 2026), and the remaining 75% (112,500 shares) in 12 equal quarterly installments of 9,375 shares commencing October 1, 2026 (subject to a rounding adjustment on the final installment). The exercise price equals the closing price of the Issuer's common stock on the Nasdaq Capital Market on the date of grant. The restricted stock unit award was granted pursuant to the 374Water Inc. 2021 Equity Incentive Plan, as amended. The RSUs vest as follows: 25% (31,250 shares) on the grant date (July 1, 2026), and the remaining 75% (93,750 shares) in 12 equal quarterly installments of 7,813 shares commencing October 1, 2026 (subject to a rounding adjustment on the final installment to account for the aggregate total of 93,750 shares). /s/ Chuck Maurice Weiser 2026-07-08