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Commitments and Contingent Liabilities (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
gal
l
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Commitments and Contingent Liabilities [Line Items]      
Average purchase of gallons | l 47    
Estimated incremental borrowing rate 4.03%    
Operating leases, lease expense | $ $ 0.8 $ 0.8 $ 0.8
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Present Value of Lease Payments    
Estimated obligation expenditure | $ $ 9.6    
Purchase Commitment [Member]      
Commitments and Contingent Liabilities [Line Items]      
Purchase commitment expiration date of contract Nov. 30, 2048    
Water Supply [Member]      
Commitments and Contingent Liabilities [Line Items]      
Average purchase of gallons | gal 27,000,000    
NJBPU-Regulated Water [Member]      
Commitments and Contingent Liabilities [Line Items]      
Purchase commitment expiration date of contract Feb. 27, 2026    
Average purchase of gallons | l 3    
Treated Water [Member]      
Commitments and Contingent Liabilities [Line Items]      
Average purchase of gallons | gal 75,000,000