HTO · Annual Report (Form 10-K) · Filed February 26, 2026

H2o America — 10-K exhibit

a2025q410kexhibit321.htm

H2o America on Boardroom Alpha

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Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of H2O America (the “Company”) on Form 10-K for the year ended December 31, 2025, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Andrew F. Walters, Chief Executive Officer and Chair of the Board, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge on the date hereof:

(1)the Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.


/s/ ANDREW F. WALTERS
Andrew F. Walters
Chief Executive Officer and Chair of the Board
(Principal executive officer)
February 26, 2026

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