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Summary of Significant Accounting Policies: (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) registrant customer	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Oct. 30, 2020 USD ($)	Jul. 01, 2020 USD ($)
Nature of Operations:
Number of customers | customer	1,000,000
Number of States in which Entity Operates	9
Basis of Presentation [Abstract]
Number of registrants filing combined report | registrant	2
Related Party Transactions
Incremental expansion of borrowing capacity				$ 30,000,000
Parent Company [Member] | Syndicated Revolving Credit Facility member [Member]
Related Party Transactions
Notes Payable, Noncurrent	$ 107,000,000.0
ASUS
Related Party Transactions
Payments to affiliate for corporate office administrative and general costs	$ 1,500,000	$ 1,400,000
ASUS | Contracted Services
Nature of Operations:
Period of fixed price contracts to operate and maintain water systems at various military bases	50 years
Bear Valley Electric Service, Inc.
Related Party Transactions
Payments to affiliate for corporate office administrative and general costs	$ 799,000
Maximum borrowing capacity on line of credit					$ 35,000,000
Incremental expansion of borrowing capacity	15,000,000.0
Outstanding borrowings	$ 22,000,000.0
Bear Valley Electric Service, Inc. | Electric Service Utility Operations
Nature of Operations:
Number of customers | customer	24,500
Golden State Water Company
Related Party Transactions
Related Party Transaction, Terms and Manner of Settlement	24
Notes Receivable from AWR parent	$ 12,000,000.0		$ 0
Due to Related Parties	$ 0
Golden State Water Company | Water Service Utility Operations
Nature of Operations:
Number of customers | customer	262,000
Golden State Water Company and Bear Valley Electric Service Inc.
Summary of significant accounting policies
Regulatory asset-CEMA	$ 5,700,000
Maximum [Member] | Parent Company [Member] | Revolving Credit Facility [Member]
Related Party Transactions
Line of Credit Facility, Current Borrowing Capacity	$ 200,000,000.0

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