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Cover - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 28, 2022
Jun. 30, 2021
Cover [Abstract]      
Entity Registrant Name 374WATER INC.    
Entity Central Index Key 0000933972    
Document Type 10-K/A    
Amendment Flag true    
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, 2021    
Entity Filer Category Non-accelerated Filer    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Entity Ex Transition Period false    
Entity Common Stock Shares Outstanding   126,680,895  
Entity Public Float     $ 45,785,090
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, 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    
Security 12g Title Common Stock, par value $0.0001 per share    
Entity Interactive Data Current Yes    
Amendment Description On March 1, 2022, 374Water Inc. (the “Company”) filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2021 (the “Original Form 10-K”). This Amendment No. 1 (the “Amendment”) amends Part III, Items 10 through 14 of the Original Form 10-K to include information previously omitted from the Original Form 10-K in reliance on General Instruction G(3) to Form 10-K, which provides that registrants may incorporate by reference certain information from a definitive proxy statement which involves the election of directors if such definitive proxy statement is filed with the Securities and Exchange Commission (the “SEC”) within 120 days after the end of the fiscal year. The Company is filing this Amendment to include Part III information in its Original Form 10-K because the Company will not file a definitive information statement containing this information before that date. The reference on the cover of the Original Form 10-K to the incorporation by reference to portions of its definitive information statement into Part III has been deleted. Except for the addition of the Part III information, the update to the cover page, and the filing of related certifications, this Amendment does not amend or otherwise update any other information in the Original Form 10-K. Accordingly, this Amendment should be read in conjunction with the Original Form 10-K. Except as specifically stated herein, this Amendment does not reflect events occurring after the filing of the Original Form 10-K and no attempt has been made in this Amendment to modify or update other disclosures as presented in the Original Form 10-K.    
Auditor Name CHERRY BEKAERT LLP    
Auditor Location Raleigh, North Carolina    
Auditor Firm Id 677