REVENUE RECOGNITION, Remaining Performance Obligation (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01	Dec. 31, 2023
Tariff Revenue [Member]
Remaining Performance Obligation [Abstract]
Expected timing of satisfaction for remaining performance obligation	3 months
Wastewater Inspection Revenue [Member]
Remaining Performance Obligation [Abstract]
Expected timing of satisfaction for remaining performance obligation	3 months
Contract Services Revenue [Member]
Remaining Performance Obligation [Abstract]
Expected timing of satisfaction for remaining performance obligation	6 years
SLP Plan Revenue [Member]
Remaining Performance Obligation [Abstract]
Expected timing of satisfaction for remaining performance obligation	1 year