Significant Accounting Policies, Utility Plant and Depreciation (Details) $ in Thousands	12 Months Ended
Dec. 31, 2022 USD ($) System County	Dec. 31, 2021 USD ($)
Significant Accounting Policies [Abstract]
Number of wastewater collection systems operated \| System	3
Number of wastewater collection and treatment systems operated \| System	8
Number of counties in which franchised territory is located \| County	3
Utility Plant and Depreciation [Abstract]
Utility plant acquisition adjustments	$ 9,178	$ 3,637
Amortization of utility plant acquisition adjustments	67	67
Utility plant	$ 549,141	$ 485,750
Effective rate of depreciation	2.38%	2.33%
Mains and Accessories [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 265,033	$ 242,160
Mains and Accessories [Member] \| Minimum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	12 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	$ 92,818	87,164
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	$ 87,218	73,462
Operations Structures, Reservoirs and Water Tanks [Member] \| Minimum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	10 years
Operations Structures, Reservoirs and Water Tanks [Member] \| Maximum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	56 years
Pumping and Treatment Equipment [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 40,038	37,209
Pumping and Treatment Equipment [Member] \| Minimum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	5 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	$ 18,128	16,856
Office, Transportation and Operating Equipment [Member] \| Minimum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	2 years
Office, Transportation and Operating Equipment [Member] \| Maximum [Member]
Utility Plant and Depreciation [Abstract]
Remaining life	21 years
Land and Other Non-Depreciable Assets [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 3,938	3,714
Utility Plant in Service [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	507,173	460,565
Construction Work in Progress [Member]
Utility Plant and Depreciation [Abstract]
Utility plant	$ 41,968	$ 25,185

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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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