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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 18, 2025
Jun. 28, 2024
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
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 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    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 2,694,439,281
Entity Common Stock, Shares Outstanding (in shares)   38,156,568  
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 2024    
Document Fiscal Period Focus FY    
Amendment Flag false    
GSWC      
Entity Information [Line Items]      
Document Period End Date Dec. 31, 2024    
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 Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 0
Entity Common Stock, Shares Outstanding (in shares)   173.7586  
Entity Central Index Key 0000092116    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false