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REVENUE RECOGNITION - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues | $ 28,549 | $ 27,416 | $ 54,435 | $ 51,960
Other Operating Revenue not in scope of ASC 606 | 624 | 428 | 1,065 | 775
Tariff Revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues | 25,915 | 25,185 | 49,301 | 47,555
Non-Tariff Revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues | 2,010 | 1,803 | 4,069 | 3,630
Consumption Charges [Member] | Tariff Revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues | 15,454 | 15,176 | 28,476 | 27,486
Fixed Fees [Member] | Tariff Revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues | 9,335 | 9,102 | 18,600 | 18,422
Service Charges [Member] | Tariff Revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues | 178 | 178 | 359 | 380
DSIC [Member] | Tariff Revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues | 235 | 0 | 534 | 0
Metered Wastewater Services [Member] | Tariff Revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues | 213 | 205 | 400 | 344
Industrial Wastewater Services [Member] | Tariff Revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues | 500 | 524 | 932 | 923
Service Line Protection Plans [Member] | Non-Tariff Revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues | 1,614 | 1,424 | 3,245 | 2,854
Contract Operations [Member] | Non-Tariff Revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues | 249 | 238 | 501 | 505
Design and Installation [Member] | Non-Tariff Revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues | 3 | 5 | 7 | 59
Inspection Fees [Member] | Non-Tariff Revenue [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Revenues | $ 144 | $ 136 | $ 316 | $ 212

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