BASIS OF PRESENTATION, CORPORATE TRANSACTIONS, SIGNIFICANT ACCOUNTING POLICIES, AND RECENT ACCOUNTING PRONOUNCEMENTS - Additional Information (Details)									3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Aug. 01, 2022 USD ($) $ / shares shares	Jun. 30, 2022 USD ($)	Apr. 30, 2022	Apr. 14, 2022 USD ($) mi² water_connection	Jan. 20, 2022 mi² water_connection	Jan. 13, 2022 mi² water_connection	Apr. 30, 2020 USD ($)	Jul. 14, 2015 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2014 USD ($)	Jul. 26, 2022 USD ($)
Accounting Policies [Line Items]
Regulatory assets									$ 3,200,000			$ 3,200,000		$ 2,300,000
Regulatory liabilities									0			$ 0		$ 800,000
Reversal of regulatory liabilities		$ 800,000													$ 3,400,000
Carrying cost on regulatory liabilities and assets (in percent)														4.25%
Proceeds from the offering	$ 14,900,000
IPO
Accounting Policies [Line Items]
Stock issued during period, new issues (in shares) | shares	1,150,000
Share price (in USD per share) | $ / shares	$ 13.50
Common stock purchased by affiliates (in shares) | shares	652,000
Underwriter
Accounting Policies [Line Items]
Stock issued during period, new issues (in shares) | shares	150,000
Tax Cuts and Jobs Act
Accounting Policies [Line Items]
Reversal of regulatory liabilities											$ 800,000
Line of Credit | Revolving Credit Facility | Northern Trust Loan Agreement
Accounting Policies [Line Items]
Frequency of payment and payment terms			two-year
Line of credit							$ 10,000,000									$ 15,000,000
Line of Credit | Revolving Credit Facility | Northern Trust Loan Agreement | LIBOR
Accounting Policies [Line Items]
Basis spread on variable rate (in percent)			2.00%				2.00%
Contributor
Accounting Policies [Line Items]
Tax expense on contributions (in percent)												55.00%
Tax Payer
Accounting Policies [Line Items]
Tax expense on contributions (in percent)												45.00%
Santa Cruz | Tax Cuts and Jobs Act
Accounting Policies [Line Items]
Tax reform revenue reduction														$ 415,000
Palo Verde | Tax Cuts and Jobs Act
Accounting Policies [Line Items]
Tax reform revenue reduction														669,000
Tonopah | Tax Cuts and Jobs Act
Accounting Policies [Line Items]
Tax reform revenue reduction														16,000
Northern Scottsdale | Tax Cuts and Jobs Act
Accounting Policies [Line Items]
Tax reform revenue reduction														$ 5,000
Rincon Water Company, Inc.
Accounting Policies [Line Items]
Number of active water connections | water_connection					73
Approved service area (in square miles) | mi²					8.6
Twin Hawks Utility, Inc.
Accounting Policies [Line Items]
Number of active water connections | water_connection						18
Approved service area (in square miles) | mi²						0.5
Valencia Water Company
Accounting Policies [Line Items]
Growth premium receivable for each new water meter installed								$ 3,000
Period for maximum payout of growth premium receivable (in years)								20 years
Maximum payout of growth premium receivable								$ 45,000,000
Growth premiums received									$ 600,000	$ 800,000		$ 2,200,000	$ 900,000
Farmers Water Company
Accounting Policies [Line Items]
Number of active water connections | water_connection				3,300
Approved service area (in square miles) | mi²				21.1
Expected annual revenue				$ 1,500,000