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Long-Term Debt Narrative (Details)
12 Months Ended
Feb. 03, 2020
USD ($)
Oct. 08, 2019
USD ($)
Mar. 28, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 19, 2019
USD ($)
Dec. 31, 2018
USD ($)
Unamortized Debt Issuance Expense       $ (11,737,000)   $ (3,576,000)
Long-term debt       $ 1,292,586,000   435,000,000
Document Period End Date       Dec. 31, 2019    
Significant Observable Inputs (Level 2)            
Fair value of long-term debt       $ 1,396,205,000   490,148,000
San Jose Water Company [Member] | Senior Notes [Member]            
Ratio of indebtedness to total capital       0.6666    
Ratio of net income available for interest charges for the trailing 12-month calendar period to interest charges       1.75    
SJW Group [Member] | Senior Notes [Member]            
Long-term debt       $ 560,000,000   50,000,000
SJW Group [Member] | Senior Notes [Member] | Maximum [Member]            
Stated interest rates       4.35%    
SJW Group [Member] | Senior Notes [Member] | Series A [Member]            
Ratio of indebtedness to total capital       0.6666    
Minimum net worth required for compliance       $ 175,000,000    
Cumulative net income, percentage included in net worth for compliance       30.00%    
SJW Group [Member] | Senior Notes [Member] | Series A [Member] | Minimum [Member]            
Stated interest rates       3.05%    
SJW Group [Member] | Senior Notes [Member] | Series A [Member] | Financial Guarantee [Member]            
Ratio of indebtedness to total capital       0.6666    
Minimum net worth required for compliance       $ 125,000,000    
SJW Group [Member] | Senior Notes [Member] | Series A [Member] | Financial Guarantee [Member] | Minimum [Member]            
Cumulative net income, percentage included in net worth for compliance       30.00%    
SJW Group [Member] | Senior Notes [Member] | Series 2019A [Member]            
Stated interest rates   3.05%        
Principal Debt Sold   $ 310,000,000        
SJW Group [Member] | Senior Notes [Member] | Series 2019B [Member]            
Stated interest rates   3.15%        
Principal Debt Sold   $ 75,000,000        
SJW Group [Member] | Senior Notes [Member] | Series 2019C [Member]            
Stated interest rates   3.53%        
Principal Debt Sold   $ 125,000,000        
San Jose Water Company [Member] | California Pollution Control Financing Authority Revenue Bonds [Member]            
Long-term debt       $ 450,000,000   370,000,000
San Jose Water Company [Member] | Public Utility, Bonds [Member] | California Pollution Control Financing Authority Revenue Bonds [Member]            
Long-term debt       $ 120,000,000   120,000,000
San Jose Water Company [Member] | Public Utility, Bonds [Member] | California Pollution Control Financing Authority Revenue Bonds [Member] | Minimum [Member]            
Stated interest rates       4.75%    
San Jose Water Company [Member] | Public Utility, Bonds [Member] | California Pollution Control Financing Authority Revenue Bonds [Member] | Maximum [Member]            
Stated interest rates       5.10%    
San Jose Water Company [Member] | Senior Notes [Member]            
Long-term debt       $ 330,000,000   250,000,000
San Jose Water Company [Member] | Senior Notes [Member] | Minimum [Member]            
Stated interest rates       4.29%    
San Jose Water Company [Member] | Senior Notes [Member] | Maximum [Member]            
Stated interest rates       9.45%    
San Jose Water Company [Member] | Senior Notes [Member] | Series M [Member]            
Stated interest rates     4.29%      
Principal Debt Sold     $ 80,000,000      
Connecticut Water Service, Inc. [Member] | Notes Payable to Banks [Member]            
Long-term debt       $ 23,935,000   0
Ratio of indebtedness to total capital       0.60    
Connecticut Water Service, Inc. [Member] | Notes Payable to Banks [Member] | Minimum [Member]            
Stated interest rates       4.09%    
Connecticut Water Service, Inc. [Member] | Notes Payable to Banks [Member] | Maximum [Member]            
Stated interest rates       4.15%    
Connecticut Water Company [Member]            
Long-term debt       $ 198,646,000   0
Connecticut Water Company [Member] | Public Utility, Bonds [Member] | Connecticut Innovations Revenue Bonds, Variable Rate [Member]            
Long-term debt       44,556,000    
Connecticut Water Company [Member] | Public Utility, Bonds [Member] | Connecticut Innovations Revenue Bonds [Member]            
Long-term debt       $ 22,506,000   0
Stated interest rates       5.00%    
Connecticut Water Company [Member] | Notes Payable to Banks [Member]            
Long-term debt       $ 119,090,000   0
Ratio of indebtedness to total capital       0.60    
Connecticut Water Company [Member] | Notes Payable to Banks [Member] | Minimum [Member]            
Stated interest rates       3.16%    
Connecticut Water Company [Member] | Notes Payable to Banks [Member] | Maximum [Member]            
Stated interest rates       4.75%    
Connecticut Water Company [Member] | Senior Notes [Member]            
Long-term debt       $ 35,000,000   0
Stated interest rates       3.53%    
SJWTX, Inc. [Member] | Senior Notes [Member]            
Long-term debt       $ 15,000,000   15,000,000
Stated interest rates       6.27%    
Maine Water Company [Member]            
Long-term debt       $ 38,032,000   0
Maine Water Company [Member] | Public Utility, Bonds [Member] | State Revolving Fund Loans [Member]            
Long-term debt       $ 16,032,000   0
Maine Water Company [Member] | Public Utility, Bonds [Member] | State Revolving Fund Loans [Member] | Minimum [Member]            
Stated interest rates       0.00%    
Maine Water Company [Member] | Public Utility, Bonds [Member] | State Revolving Fund Loans [Member] | Maximum [Member]            
Stated interest rates       2.58%    
Maine Water Company [Member] | Public Utility, Bonds [Member] | First Mortgage Bonds [Member]            
Stated interest rates       8.95%    
Ratio of indebtedness to total capital       0.65    
Maine Water Company [Member] | Public Utility, Bonds [Member] | State Revolving Fund Loans Series S [Member]            
Long-term debt         $ 5,000,000  
Stated interest rates         1.00%  
Maine Water Company [Member] | Mortgages [Member] | First Mortgage Bonds [Member]            
Long-term debt       $ 4,500,000   0
Maine Water Company [Member] | Notes Payable to Banks [Member]            
Long-term debt       $ 17,500,000   0
Maine Water Company [Member] | Notes Payable to Banks [Member] | Minimum [Member]            
Stated interest rates       4.18%    
Maine Water Company [Member] | Notes Payable to Banks [Member] | Maximum [Member]            
Stated interest rates       5.51%    
Heritage Valley Water Company [Member] | Notes Payable to Banks [Member]            
Long-term debt       $ 4,164,000   0
Stated interest rates       4.75%    
Principal and interest payments       $ 31,000    
Avon Water Company [Member] | Mortgages [Member]            
Long-term debt       $ 2,809,000   $ 0
Loan amortization period       20 years    
Stated interest rates       3.05%    
Principal and interest payments       $ 22,000    
SJWTX,Inc. dba Canyon Lake Water Supply Corporation [Member] | Senior Notes [Member] | Series A [Member]            
Ratio of indebtedness to total capital       0.6666    
Ratio of net income available for interest charges for the trailing 12-month calendar period to interest charges       1.75    
Subsequent Event [Member] | Maine Water Company [Member]            
Increase (Decrease) in Restricted Cash $ (4,114,000)