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Cover
 3 Months Ended
Mar. 31, 2022
Cover [Abstract]  
Entity Registrant Name 374Water Inc.
Entity Central Index Key 0000933972
Document Type S-1
Amendment Flag false
Entity Small Business true
Entity Emerging Growth Company true
Entity Filer Category Non-accelerated Filer
Entity Ex Transition Period false
Entity Incorporation State Country Code DE
Entity Tax Identification Number 88-0271109
Entity Address Address Line 1 701 W. Main Street
Entity Address Address Line 2 Suite 410
Entity Address City Or Town Durham
Entity Address State Or Province NC
Entity Address Postal Zip Code 27701
City Area Code 919
Local Phone Number 888-8194