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Cover
Feb. 27, 2024
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Feb. 27, 2024
Entity File Number 001-14431
Entity Registrant Name AMERICAN STATES WATER COMPANY
Entity Central Index Key 0001056903
Entity Tax Identification Number 95-4676679
Entity Incorporation, State or Country Code CA
Entity Address, Address Line One 630 East Foothill Blvd.
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security American States Water Company Common Shares
Trading Symbol AWR
Security Exchange Name NYSE
Entity Emerging Growth Company false