Capitalization	9 Months Ended
Sep. 30, 2025
Equity [Abstract]
Capitalization	Capitalization In October 2024, H2O America entered into an equity distribution agreement (the, “Equity Distribution Agreement”) with BofA Securities, Inc., J.P. Morgan Securities LLC, RBC Capital Markets, LLC and Wells Fargo Securities, LLC, pursuant to which the company may offer and sell shares of its common stock, $0.001 par value per share, from time to time in “at-the-market” offerings, having an aggregate gross sales price of up to $200,000. The Equity Distribution Agreement replaced the previous agreement that ended in 2024. For the three and nine months ended September 30, 2025, H2O America issued and sold a total of 492,859 and 2,076,352 shares of common stock, respectively, with a weighted average price of $50.27 and $52.47 per share respectively, and received $24,425 and $108,138 in net proceeds, respectively, under the Equity Distribution Agreement. Since the inception of the Equity Distribution Agreement, H2O America has issued and sold 2,451,865 shares of common stock at a weighted average price of $52.92 for a total net proceeds of $128,307 and has $70,239 of aggregate gross sales price of shares remaining to issue under the Equity Distribution Agreement as of September 30, 2025.

Capitalization

9 Months Ended

Sep. 30, 2025

In October 2024, H2O America entered into an equity distribution agreement (the, “Equity Distribution Agreement”) with BofA Securities, Inc., J.P. Morgan Securities LLC, RBC Capital Markets, LLC and Wells Fargo Securities, LLC, pursuant to which the company may offer and sell shares of its common stock, $0.001 par value per share, from time to time in “at-the-market” offerings, having an aggregate gross sales price of up to $200,000. The Equity Distribution Agreement replaced the previous agreement that ended in 2024. For the three and nine months ended September 30, 2025, H2O America issued and sold a total of 492,859 and 2,076,352 shares of common stock, respectively, with a weighted average price of $50.27 and $52.47 per share respectively, and received $24,425 and $108,138 in net proceeds, respectively, under the Equity Distribution Agreement. Since the inception of the Equity Distribution Agreement, H2O America has issued and sold 2,451,865 shares of common stock at a weighted average price of $52.92 for a total net proceeds of $128,307 and has $70,239 of aggregate gross sales price of shares remaining to issue under the Equity Distribution Agreement as of September 30, 2025.