Significant Accounting Policies, Utility Plant and Depreciation (Details) $ in Thousands	12 Months Ended
Dec. 31, 2024 USD ($) County System	Dec. 31, 2023 USD ($)
Significant Accounting Policies [Abstract]
Number of wastewater collection systems operated \| System	3
Number of wastewater collection and treatment systems operated \| System	11
Number of counties in which franchised territory is located \| County	4
Utility Plant and Depreciation [Abstract]
Utility plant acquisition adjustments	$ 9,838	$ 9,384
Amortization of utility plant acquisition adjustments	79	69
Utility plant	$ 664,927	$ 620,201
Effective rate of depreciation	2.50%	2.55%
Mains and Accessories [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 308,020	$ 286,993
Mains and Accessories [Member] \| Minimum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	14 years
Mains and Accessories [Member] \| Maximum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	86 years
Services, Meters, and Hydrants [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 106,200	98,387
Services, Meters, and Hydrants [Member] \| Minimum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	14 years
Services, Meters, and Hydrants [Member] \| Maximum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	47 years
Operations Structures, Reservoirs, and Water Tanks [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 143,821	89,207
Operations Structures, Reservoirs, and Water Tanks [Member] \| Minimum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	9 years
Operations Structures, Reservoirs, and Water Tanks [Member] \| Maximum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	54 years
Pumping and Treatment Equipment [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 51,906	44,719
Pumping and Treatment Equipment [Member] \| Minimum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	6 years
Pumping and Treatment Equipment [Member] \| Maximum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	34 years
Office, Transportation, and Operating Equipment [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 20,519	19,292
Office, Transportation, and Operating Equipment [Member] \| Minimum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	3 years
Office, Transportation, and Operating Equipment [Member] \| Maximum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	19 years
Land and Other Non-Depreciable Assets [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 5,833	5,685
Utility Plant in Service [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	636,299	544,283
Construction Work in Progress [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 28,628	$ 75,918

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount of acquisition adjustments included in property, plant and equipment (PPE) for utilities.

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Composite depreciation rate for public utility plants in service.

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Period end amount of total gross PPE.

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Number of counties in which the Company's franchised territory is located within south-central Pennsylvania.

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The number of wastewater treatment and collection systems operated by the entity.

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The number of wastewater collection systems operated by the entity.

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Amount of amortization of utility plant acquisition adjustments.

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