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Lines of Credit Narrative (Details)
 12 Months Ended
May 11, 2020
USD ($)
Dec. 31, 2020
USD ($)
May 29, 2020
USD ($)
May 28, 2020
USD ($)
Mar. 01, 2020
USD ($)
Feb. 29, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 01, 2016
USD ($)
Revolving Credit Facility | SJW Group                
Line of Credit Facility [Line Items]                
Aggregate outstanding balance on lines of credit   $ 175,094,000         $ 117,209,000  
Line of Credit | Revolving Credit Facility | SJW Group                
Line of Credit Facility [Line Items]                
Line of credit cost of borrowing rate   1.78%         3.73%  
Line of Credit | Revolving Credit Facility | Chase Bank, N.A. | San Jose Water Company                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity $ 140,000,000             $ 125,000,000
Increase in maximum borrowing capacity 15,000,000              
Line of Credit | Revolving Credit Facility | Chase Bank, N.A. | SJW Corp. and SJW Land Company                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity               15,000,000
Line of Credit | Revolving Credit Facility | CoBank | Connecticut Water Service, Inc.                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity     $ 40,000,000 $ 15,000,000        
Increase in maximum borrowing capacity     $ 25,000,000          
Line of Credit | Revolving Credit Facility | RBS Citizens, N.A. | Connecticut Water Service, Inc.                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity         $ 75,000,000 $ 95,000,000    
Line of Credit | Revolving Credit Facility - Temporary | Chase Bank, N.A. | San Jose Water Company                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity $ 50,000,000              
Line of credit, term 6 months              
Aggregate outstanding balance on lines of credit $ 0              
Line of Credit | Credit Agreement | Standby Letters of Credit | Chase Bank, N.A. | San Jose Water Company                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity               10,000,000
Line of Credit | SJW Corp Credit Agreement | Standby Letters of Credit | Chase Bank, N.A. | SJW Corp. and SJW Land Company                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity               5,000,000
Line of Credit | SJWTX Credit Agreement | Revolving Credit Facility | Chase Bank, N.A. | SJW Corp. and SJWTX, Inc.                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity               5,000,000
Line of Credit | SJWTX Credit Agreement | Standby Letters of Credit | Chase Bank, N.A. | SJW Corp. and SJWTX, Inc.                
Line of Credit Facility [Line Items]                
Line of credit facility, maximum borrowing capacity               $ 1,000,000
Bank term loans | Connecticut Water Service, Inc.                
Line of Credit Facility [Line Items]                
Ratio of indebtedness to total capital   0.65            
Bank term loans | Connecticut Water Company                
Line of Credit Facility [Line Items]                
Interest coverage ratio   3            
Ratio of indebtedness to total capital   0.60            
Bank term loans | Maine Water Company                
Line of Credit Facility [Line Items]                
Ratio of indebtedness to total capital   0.60            
Bank term loans | Unsecured Debt | San Jose Water Company                
Line of Credit Facility [Line Items]                
Debt covenant interest charge maximum to net Income available to stockholders   1.75            
Ratio of indebtedness to total capital   0.666            
Bank term loans | Unsecured Debt | SJW Corp. and SJWTX, Inc.                
Line of Credit Facility [Line Items]                
Debt covenant interest charge maximum to net Income available to stockholders   1.75            
Ratio of indebtedness to total capital   0.666