X0202 SCHEDULE 13G/A 0001214659-26-003056 0001924953 XXXXXXXX LIVE 3 Common Stock, par value $0.001 per share 09/21/2026 0000766829 H2O America 784305104 110 West Taylor Street San Jose CA 95110 Rule 13d-1(b) ATLAS Infrastructure Partners (UK) Ltd. X0 0.00 4675469.00 0.00 4675469.00 4675469.00 N 11.17 IA The percentages used in this Schedule 13G are calculated based upon 41,856,804 Common Stock outstanding as of July 24, 2026, as reported in the Company's Report on Form 10-Q for the period ended June 30, 2026, filed with the Securities and Exchange Commission on July 28, 2026. This amendment is being filed to correct the filer's designation under Rule 13d-1 in the original Schedule 13G filed on March 10, 2026, and Amendment No. 1 thereto filed on April 8, 2026 (together, the "Prior Filing"). The Prior Filing incorrectly selected Rule 13d-1(c) instead of Rule 13d-1(b). GIP Atlas Holdings Limited X0 0.00 4675469.00 0.00 4675469.00 4675469.00 N 11.17 IA The percentages used in this Schedule 13G are calculated based upon 41,856,804 Common Stock outstanding as of July 24, 2026, as reported in the Company's Report on Form 10-Q for the period ended June 30, 2026, filed with the Securities and Exchange Commission on July 28, 2026. GIP Atlas Holdings Limited is the sole owner of Atlas Infrastructure Partners (UK) Ltd, holding 100% of its equity interests; however, it does not exercise investment discretion with respect to the entity. This amendment is being filed to correct the filer's designation under Rule 13d-1 in the original Schedule 13G filed on March 10, 2026, and Amendment No. 1 thereto filed on April 8, 2026 (together, the "Prior Filing"). The Prior Filing incorrectly selected Rule 13d-1(c) instead of Rule 13d-1(b). H2O America 110 West Taylor Street, San Jose, CA, 95110 ATLAS Infrastructure Partners (UK) Ltd. GIP Atlas Holdings Limited 1ST Floor West, 1-3 College Hill, London, EC4R 2RA United Kingdom N IA 4,675,469 11.17 0 4,675,469 0 4,675,469 Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. ATLAS Infrastructure Partners (UK) Ltd. Clinton Joyner 09/22/2026 GIP Atlas Holdings Limited Clinton Joyner 09/22/2026