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REVENUE RECOGNITION, Disaggregated Revenues (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2024
USD ($)
Contract
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
REVENUE RECOGNITION [Abstract]      
Minimum number of days due for accounts receivable from tariff contract customers 25 days    
Reserve or reduction to revenue $ 0 $ 0  
Minimum number of days due for accounts receivable from SLP Plan customer 25 days    
Minimum number of days customers services invoiced in advance 30 days    
Number of operation contracts paid in advance | Contract 1    
Disaggregation of Revenue [Abstract]      
Other Operating Revenue not in scope of ASC 606 $ 1,767 1,591 $ 1,881
Revenue from acquisition 107,952 98,861 98,897
Tariff Revenue [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from acquisition 98,841 89,987 87,424
Tariff Revenue [Member] | Consumption Charges [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from acquisition 58,477 49,051 47,809
Tariff Revenue [Member] | Fixed Fees [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from acquisition 36,825 33,074 31,431
Tariff Revenue [Member] | Service Charges [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from acquisition 735 682 597
Tariff Revenue [Member] | DSIC [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from acquisition 136 4,727 5,085
Tariff Revenue [Member] | Metered Wastewater Services [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from acquisition 809 602 649
Tariff Revenue [Member] | Industrial Wastewater Services [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from acquisition 1,859 1,851 1,853
Non-Tariff Revenue [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from acquisition 7,344 7,283 9,592
Non-Tariff Revenue [Member] | Service Line Protection Plans [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from acquisition 5,825 5,632 5,020
Non-Tariff Revenue [Member] | Contract Operations [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from acquisition 1,047 1,046 931
Non-Tariff Revenue [Member] | Design and Installation [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from acquisition 62 181 3,315
Non-Tariff Revenue [Member] | Inspection Fees [Member]      
Disaggregation of Revenue [Abstract]      
Revenue from acquisition $ 410 $ 424 $ 326