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( Mark One ) × Annual Report pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 for the fiscal year ended December 31 , 2020 or Transition report pursuant to Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 for the transition period from to Commission File Number 001-14431 001-12008 SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 FORM 10 - K FOR ANNUAL AND TRANSITION REPORTS PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Registrant , State of Incorporation Address , Zip Code and Telephone Number American States Water Company Incorporated in California 630 E. Foothill Boulevard , San Dimas CA American States Water Company Golden State Water Company Title of Each Class American States Water Company Common Shares American States Water Company Golden State Water Company Golden State Water Company Incorporated in California 630 E. Foothill Boulevard , San Dimas CA Yes Yes ( 909 ) 394-3600 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol AWR Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by check mark if the Registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . American States Water Company Golden State Water Company Yes Yes 91773-1212 ( 909 ) 394-3600 Yes Yes 91773-1212 Yes Yes IRS Employer Identification No. 95-4676679 Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . American States Water Company Golden State Water Company 95-1243678 Name of Each Exchange on Which Registered New York Stock Exchange No No Indicate by check mark whether Registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that Registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . No No No No ☐ X Indicate by check mark whether Registrant has submitted electronically and posted on its corporate Web site , if any , every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S - T ( § 232.405 of this chapter ) during the preceding 12 months ( or such shorter period that the Registrant was required to submit and post such files ) . X X No No