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Document and Entity Information Document
Feb. 26, 2020
Document and Entity Information [Abstract]  
Entity Central Index Key 0000766829
Document Type 8-K
Document Period End Date Feb. 26, 2020
Entity Registrant Name SJW Group
Entity Incorporation, State or Country Code DE
Entity File Number 001-8966
Entity Tax Identification Number 77-0066628
Entity Address, Address Line One 110 West Taylor Street,
Entity Address, City or Town San Jose,
Entity Address, State or Province CA
Entity Address, Postal Zip Code 95110
City Area Code (408)
Local Phone Number 279-7800
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, par value $0.001 per share
Trading Symbol SJW
Security Exchange Name NYSE
Entity Emerging Growth Company false
Amendment Flag false