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Cover
Oct. 12, 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 Oct. 12, 2021
Entity Ex Transition Period false
Entity Incorporation State Country Code DE
Entity File Number 000-27866
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
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock
Trading Symbol SCWO