HTO

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EXHIBIT 99.1

H2O America Announces Third Quarter 2026 Financial Results

•Third quarter 2026 reported diluted EPS of $0.99 and adjusted diluted EPS (non-GAAP)1 of $1.04, as compared to reported and adjusted diluted EPS in the third quarter of 2025 of $1.27 and $1.27, respectively

•Year-to-date 2026 reported diluted EPS of $2.13 and adjusted diluted EPS (non-GAAP)1 of $2.30, as compared to reported and adjusted diluted EPS in the same period of 2025 of $2.48 and $2.53, respectively

•2026 standalone adjusted diluted EPS guidance, which excludes the impacts of the Quadvest and pending Cibolo Valley acquisitions and the financings thereof, narrowed to $3.10-$3.161 (midpoint remains $3.13). 2026 adjusted diluted EPS guidance, including the impacts of the acquisitions and the financings thereof, initiated at $2.91-$2.971

•No change to our 5-year and long-term diluted EPS growth and financial targets

•$325.1 million2 of total company-funded infrastructure investments in 2026 through the third quarter out of a revised full year capital plan of approximately $465 million; no change to our total $2.7 billion2 capital plan over the 2026-30 period

•Quadvest acquisition closed on October 1, 2026; active Quadvest connections up 14%, or 7,700, in 2026 while connections under contract and pending development have grown 13%, or 11,300 connections, in 2026

•Declared $0.44 cash dividend per share of common stock

SAN JOSE, Calif. — October 26, 2026 — H2O America (NASDAQ: HTO) today reported financial results for the third quarter of 2026.

"Our third quarter results have our company in position to deliver on our full year 2026 guidance and we remain committed to our longer-term financial targets," said chair and chief executive officer, Andrew F. Walters. "The close of the Quadvest acquisition earlier this month marked a significant milestone in our strategy to build a stronger, more diversified utility portfolio. The addition of Quadvest's active connections plus the anticipated build out of its development pipeline along with our more than $750 million of capital investments that we have planned through 2030 across the combined Texas Water Company enterprise means that Texas will be an increasingly meaningful driver of H2O America's long-term ability to provide sustainable value for all of our customers, communities and capital partners. Beyond Texas, I am incredibly proud of the progress that our teams have made with respect to the general rate cases in Connecticut and Maine as we pursue recovery of the more than $180 million of combined investments that are not yet recognized in rates as well as the preparations being made by our California team with respect to the upcoming 2028-30 GRC filing. I am so very grateful to lead a team of such dedicated partners as we work to execute on our operational, regulatory and financial growth goals while providing our customers and the communities that we are honored to serve with the high-quality service they deserve."

Third Quarter 2026 Operating Results

Net income prepared in accordance with GAAP for the third quarter ended September 30, 2026 was $43.0 million, a 5% decrease compared to $45.1 million in the same quarter last year. GAAP diluted EPS for the quarter of $0.99 decreased versus $1.27 in the prior year quarter.

Adjusting for costs associated with merger, acquisition and integration activities and non-utility real estate transactions, H2O America's adjusted net income (non-GAAP)1 in the third quarter of 2026 was $45.2 million, a decrease of 1% compared to $45.5 million in the prior year quarter. Adjusted diluted EPS (non-GAAP) for the quarter of $1.04 decreased versus $1.27 in the prior year quarter.

For both GAAP and adjusted results, while our net income was down modestly during the 2026 period, there was a more profound impact on EPS from the higher share count as a result of leveraging our at-the-market (ATM) program throughout 2025 and our common stock issuance in early March of 2026. A full reconciliation of GAAP net income to adjusted net income for the quarter ended September 30, 2026 is included in the tables at the end of this news release.

Operating revenue for the third quarter was $250.2 million, compared to $240.6 million for the same quarter last year, a 4% increase. The increase was driven primarily by rate increases of $16.2 million, nearly half of which relates to higher pass-through water costs, across all of our states but primarily in California and Connecticut. This was partially offset by lower customer consumption of $4.1 million and a decrease of $2.6 million due to regulatory mechanism adjustments.

Operating expenses for the third quarter were $189.7 million, up 8% compared to $175.9 million for the same quarter last year. This change in operating expenses primarily reflects:

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•An increase in water production expenses of $5.0 million compared to the same quarter last year primarily

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EXHIBIT 99.1

H2O America Announces Second Quarter 2026 Financial Results

•Second quarter 2026 reported diluted EPS of $0.62 and adjusted diluted EPS (non-GAAP)1 of $0.72, as compared to reported and adjusted diluted EPS in the second quarter of 2025 of $0.71 and $0.75, respectively

•Year-to-date 2026 reported diluted EPS of $1.12 and adjusted diluted EPS (non-GAAP)1 of $1.23, as compared to reported and adjusted diluted EPS in the same period of 2025 of $1.20 and $1.25, respectively

•Reiterate all aspects of financial guidance, including 2026 standalone adjusted diluted EPS guidance of $3.08-$3.181 (excluding the impacts of the pending Quadvest acquisition and the financing thereof)

•$206.9 million2 invested in infrastructure during the first half of 2026

•Key milestones reached in Quadvest approval process; anticipate closing end of third/early fourth quarter of 2026; active Quadvest connections up 10%, or 5,400, in 2026 while connections under contract and pending development has grown 14%, or nearly 12,000 connections

•Declared $0.44 cash dividend per share of common stock

SAN JOSE, Calif. — July 27, 2026 — H2O America (NASDAQ: HTO) today reported financial results for the second quarter of 2026.

"Our strong second quarter results have our company in an excellent position midway through 2026 to deliver on our full year guidance and we remain committed to our longer-term financial targets," said chair and chief executive officer, Andrew F. Walters. "During the second quarter, our teams made substantial progress towards obtaining Texas regulatory approval for the regulated portion of the Quadvest acquisition. In addition, a great deal of thought and effort went into the general rate cases that we filed in Connecticut and Maine seeking the recovery of more than $180 million of combined investments that are not yet recognized in rates. The regulatory and operational focus of our team is unwavering as we execute on our growth strategy while providing our customers and the communities that we are honored to serve with the high quality service they deserve. The hard work and shared passion that my fellow partners here at H2O America exhibit each and every day make it all possible and I could not be more proud."

Second Quarter 2026 Operating Results

Net income prepared in accordance with GAAP for the second quarter ended June 30, 2026 was $26.6 million, an 8% increase compared to $24.7 million in the same quarter last year. GAAP diluted EPS for the quarter of $0.62 decreased versus $0.71 in the prior year quarter.

Adjusting for costs associated with merger, acquisition and integration activities and non-utility real estate transactions, H2O America's adjusted net income (non-GAAP)1 in the second quarter of 2026 was $30.7 million, an increase of 17% compared to $26.2 million in the prior year quarter. Adjusted diluted EPS (non-GAAP) for the quarter of $0.72 slightly decreased versus $0.75 in the prior year quarter.

For both GAAP and adjusted results, while our underlying net income grew during the 2026 period, this was more than offset by the higher share count as a result of leveraging our at-the-market (ATM) program throughout 2025 and our common stock issuance in early March of 2026. A full reconciliation of GAAP net income to adjusted net income for the quarter ended June 30, 2026 is included in the tables at the end of this news release.

Operating revenue for the second quarter was $210.5 million, compared to $198.3 million for the same quarter last year, a 6% increase. The increase was driven primarily by rate increases of $14.5 million across all of our states but primarily in California and Connecticut. This was partially offset by a decrease of $1.7 million due to regulatory mechanism adjustments.

Operating expenses for the second quarter were $167.7 million, up 9% compared to $154.4 million for the same quarter last year. This change in operating expenses primarily reflects:

•An increase in water production expenses of $4.6 million compared to the same quarter last year primarily attributable to increases in average per unit costs for purchased water and groundwater extraction, partially offset by lower usage.

•An increase in depreciation and amortization expense of $3.4 million associated with utility plant additions placed in service compared to the same quarter last year.

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•An increase in all other operating expenses of $5.3 million compared to the same quarter last year primarily attributable to a net increase in general and administrative expenses driven by increased merger and acquisition costs, increased outsourced services costs, increased employee-related costs and increased maintenance agreement costs.

The effective consolidated income tax rates for the second quarter of 2026 and 2025 were approximately 13% and 16%, respectively. The lower effective tax rate for the second quarter of 2026 was primarily due to higher flow t

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EXHIBIT 99.1

H2O America Announces First Quarter 2026 Financial Results

•First quarter 2026 reported diluted EPS of $0.49 and adjusted diluted EPS (non-GAAP)1 of $0.50, consistent with reported and adjusted diluted EPS in the first quarter of 2025

•Reiterate 2026 standalone adjusted diluted EPS guidance of $3.08-3.181 (excludes the impacts of the pending Quadvest acquisition and the financing thereof)

•Reiterate long-term adjusted diluted EPS CAGR target of 6-8%; expect to deliver a non-linear CAGR at or above the top end of the 6-8% range over the 2026-30 period (includes the impacts of the pending Quadvest and Cibolo Valley acquisitions and the financing thereof)

•No change to our 2026 capital expenditure budget of $483 million (excludes the impact of Quadvest) or our $2.7 billion plan over the 2026-30 period (includes Quadvest)

•Quadvest approval process underway; anticipate closing during the second half of 2026; active Quadvest connections up 5%, or 2,800, from year-end 2025 while the backlog grew 6%, or 5,000 connections

•Declared $0.44 cash dividend per share of common stock

SAN JOSE, Calif. — April 28, 2026 — H2O America (NASDAQ: HTO) today reported financial results for the first quarter of 2026.

"Our strong first quarter of 2026 results were consistent with our internal expectations and reflective of the positive regulatory outcomes our team has achieved in recent years," said chair and chief executive officer, Andrew F. Walters. "We made progress executing on our planned $483 million of infrastructure investments in 2026 needed to continue to provide the high quality, reliable service that our customers deserve. Longer-term, we remain steadfast in our commitment to deliver on the 2026-30 financial plan that we rolled out at the end of February, including achieving a 5-year EPS CAGR at or above the top end of our 6-8% target, while continuing to work constructively with regulators and legislators in all four of our states to recover critical water infrastructure investments made. Further, the $700 million equity raise that we completed in early March, which included a $400 million forward component, addresses our forecasted equity needs through 2027. Based on these accomplishments, I believe our company is poised for long-term success."

First Quarter 2026 Operating Results

Net income prepared in accordance with GAAP for the first quarter ended March 31, 2026 was $19.0 million, a 15% increase compared to $16.6 million in the same quarter last year. GAAP diluted EPS for the quarter of $0.49 was unchanged versus $0.49 in the prior year quarter.

Adjusting for merger and acquisition activities and real estate transactions, H2O America's adjusted net income (non-GAAP) in the first quarter of 2026 was $19.4 million, an increase of 16% compared to $16.7 million in the prior year quarter. Adjusted diluted EPS (non-GAAP) for the quarter of $0.50 was unchanged versus $0.50 in the prior year quarter.

The difference between GAAP net income and adjusted net income for the quarter ended March 31, 2026 was due to expenses incurred for merger and acquisition activities of $0.5 million, net of tax and gain on the real estate transactions of $0.1 million. A full reconciliation of GAAP net income to adjusted net income for the quarter ended March 31, 2026 is included in the tables at the end of this news release.

Operating revenue for the first quarter was $183.3 million, compared to $167.6 million for the same quarter last year, a 9% increase. The increase was driven primarily by rate increases of $11.8 million, primarily in California, Connecticut, and Texas as well as higher customer usage of $2.0 million.

Operating expenses for the first quarter were $145.9 million, up 11% compared to $131.7 million for the same quarter last year. This change in operating expenses primarily reflects:

•An increase in water production expenses of $7.5 million compared to the same quarter last year primarily attributable to increases in average per unit costs for purchased water and groundwater extraction, higher customer usage, and increases in water production balancing and memorandum accounts primarily relating to the Full Cost Balancing Account ("FCBA") partially offset by decreases in costs as a result of increased availability of surface water; and

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•An increase in other operating expenses of $6.7 million compared to the same quarter last year primarily due to increases in depreciation and amortization for new utility plant placed in service, increased maintenance, employee-related costs and higher non-labor administrative and general expenses.

The effective consolidated income tax rates for the first quarter of 2026 and 2025 were approximately 15% and 17%, respectively. The lower effective tax rate for the three months ended March 31, 2026 was primarily due to higher flow through tax benefits.

Capital Expenditures

Through March 31, 2026, H2O America has