v3.19.3.a.u2
Document and Entity Information
Jan. 28, 2020
Entity Information [Line Items]  
Document Type 8-K
Document Period End Date Jan. 28, 2020
Entity Registrant Name AMERICAN STATES WATER CO
Entity Incorporation, State or Country Code CA
Entity File Number 001-14431
Entity Tax Identification Number 95-4676679
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
Entity Central Index Key 0001056903
Amendment Flag false
Golden State Water Company  
Entity Information [Line Items]  
Entity Registrant Name GOLDEN STATE WATER CO
Entity Incorporation, State or Country Code CA
Entity File Number 001-12008
Entity Tax Identification Number 95-1243678
Entity Address, Address Line One 630 East Foothill Blvd.
Entity Address, City or Town San Dimas
Entity Address, Postal Zip Code 91773-1212
Entity Central Index Key 0000092116
Amendment Flag false