Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2025

Significant Accounting Policies [Abstract]

Utility Plant

The following remaining lives are used for financial reporting purposes:

	December 31				Approximate range
Utility Plant Asset Category	2025		2024		of remaining lives
Mains and accessories	$	336,517	$	308,020	13 – 86 years
Services, meters, and hydrants		114,894		106,200	15 – 47 years
Operations structures, reservoirs, and water tanks		145,645		143,821	8 – 70 years
Pumping and treatment equipment		53,704		51,906	7 – 35 years
Office, transportation, and operating equipment		21,578		20,519	3 – 21 years
Land and other non-depreciable assets		5,845		5,833		–
Utility plant in service		678,183		636,299
Construction work in progress		32,938		28,628		–
Total Utility Plant	$	711,121	$	664,927

Regulatory Assets and Liabilities

Regulatory assets and liabilities are comprised of the following:

	December 31				Remaining Recovery
	2025		2024		Periods
Assets
Income taxes	$	47,186	$	40,880	Various
Unrealized swap losses		470		382	1 – 4 years
Utility plant retirement costs		8,955		10,221	5 years
Customer-owned lead service line replacements		1,016		1,173	Various
Income taxes on customers’ advances for construction and contributions in aid of construction		1,119		1,176	Various
Service life study expenses		9		14	2 years
Rate case filing expenses		542		215	1 - 4 years
	$	59,297	$	54,061
Liabilities
Excess accumulated deferred income taxes on accelerated depreciation	$	12,907	$	13,090	Various
Postretirement benefits		25,785		22,825	Not yet known
Income taxes		6,379		6,520	Various
IRS TPR catch-up deduction		2,116		2,376	8 years
	$	47,187	$	44,811