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Cover
Nov. 16, 2021
Cover [Abstract]  
Entity Registrant Name 374WATER INC.
Entity Central Index Key 0000933972
Document Type 8-K
Amendment Flag false
Entity Emerging Growth Company true
Document Period End Date Nov. 16, 2021
Entity Ex Transition Period 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
Written Communications false
Soliciting Material false
Local Phone Number 888-8194
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock
Trading Symbol SCWO