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Document and Entity Information - USD ($) $ in Thousands	12 Months Ended
Document and Entity Information - USD ($) $ in Thousands	Dec. 31, 2019	Feb. 20, 2020	Jun. 30, 2019
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-14431
Entity Registrant Name	American States Water Company
Entity Tax Identification Number	95-4676679
Entity Incorporation, State or Country Code	CA
Entity Address, Address Line One	630 E. Foothill Boulevard,
Entity Address, City or Town	San Dimas
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	91773-1212
City Area Code	(909)
Local Phone Number	394-3600
Title of 12(b) Security	American States Water Company Common Shares
Trading Symbol	AWR
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 2,771,217
Entity Common Stock, Shares Outstanding (in shares)		36,859,505
Documents Incorporated by Reference	Portions of the Proxy Statement of American States Water Company will be subsequently filed with the Securities and Exchange Commission as to Part III, Item Nos. 10, 11, 13 and 14 and portions of Item 12, in each case as specifically referenced herein.
Entity Central Index Key	0001056903
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
GSWC
Entity Information [Line Items]
Entity File Number	001-12008
Entity Registrant Name	Golden State Water Company
Entity Tax Identification Number	95-1243678
Entity Incorporation, State or Country Code	CA
Entity Address, Address Line One	630 E. Foothill Boulevard,
Entity Address, City or Town	San Dimas
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	91773-1212
City Area Code	(909)
Local Phone Number	394-3600
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Shell Company	false
Entity Central Index Key	0000092116
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Subsequent Event [Member]
Entity Information [Line Items]
Entity Public Float		$ 3,325,833