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Cover - USD ($)
 12 Months Ended
Dec. 31, 2022
Mar. 13, 2023
Jun. 30, 2022
Cover [Abstract]      
Entity Registrant Name 374WATER INC.    
Entity Central Index Key 0000933972    
Document Type 10-K    
Amendment Flag false    
Entity Voluntary Filers No    
Current Fiscal Year End Date --12-31    
Entity Well Known Seasoned Issuer No    
Entity Small Business true    
Entity Shell Company false    
Entity Emerging Growth Company true    
Entity Current Reporting Status Yes    
Document Period End Date Dec. 31, 2022    
Entity Filer Category Non-accelerated Filer    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2022    
Entity Ex Transition Period false    
Entity Common Stock Shares Outstanding   127,344,691  
Entity Public Float     $ 372,441,831
Document Annual Report true    
Document Transition Report false    
Entity File Number 000-27866    
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    
Auditor Name CHERRY BEKAERT LLP    
Auditor Location Raleigh, North Carolina    
Auditor Firm Id 677    
Local Phone Number 888-8194    
Security 12g Title Common Stock, par value $0.0001 per share    
Trading Symbol SCWO    
Entity Interactive Data Current Yes