The Palm Mutual system serves an estimated 250 residents through 63 residential customer connections and is located just two miles from Cal Water's Northeast Bakersfield Treatment Plant. Cal Water already serves Palm Mutual through a master meter interconnection, since Palm Mutual did not own or operate its own sources of supply. Cal Water plans to upgrade the system's infrastructure over time to help support long-term water quality and reliability.

"We believe everyone should have access to safe, clean, reliable, and affordable water and that bringing Palm Mutual's water system into our Bakersfield District will help its customers have the high-quality water they need for their everyday use and emergencies, both now and into the future," said Martin A. Kropelnicki, Cal Water Chairman and CEO. "We welcome Palm Mutual's customers to California Water Service and look forward to serving them."

Cal Water, the largest subsidiary of California Water Service Group (NYSE: CWT), is regulated by the CPUC, which approved the acquisition in December 2025. Cal Water's Bakerfield District already serves about 445,600 people through approximately 120,000 service connections in its own system and the City of Bakersfield water system, which it operates.

This news release contains forward-looking statements within the meaning established by the Private Securities Litigation Reform Act of 1995 ("PSLRA"). The forward-looking statements are intended to qualify under provisions of the federal securities laws for "safe harbor" treatment established by the PSLRA. Forward-looking statements in this news release are based on currently available information, expectations, estimates, assumptions and projections, and our management's beliefs, assumptions, judgments and expectations about us, the water utility industry and general economic conditions. These statements are not statements of historical fact. When used in our documents, statements that are not historical in nature, including words like will, would, expects, intends, plans, believes, may, could, estimates, assumes, anticipates, projects, progress, predicts, hopes, targets, forecasts, should, seeks or variations of these words or similar expressions, are intended to identify forward-looking statements. Examples of forward-looking statements in this news release include, but are not limited to, statements describing Cal Water's expectations regarding operating and investing in the Palm Mutual system. Forward-looking statements are not guarantees of future performance. They are based on numerous assumptions that we believe are reasonable, but they are open to a wide range of uncertainties and business risks. Consequently, actual results or outcomes may vary materially from what is contained in a forward-looking statement. Factors that may cause actual results or outcomes to be different than those expected or anticipated include, but are not limited to, our ability to integrate the business and operate the Palm Mutual water system in an effective and accretive manner as well as those described under the section entitled "Risk Factors" and elsewhere in our most recent Annual Report on Form 10-K, our subsequent Quarterly Reports on Form 10-Q, and our other Securities and Exchange Commission filings. In light of these risks, uncertainties, and assumptions, investors are cautioned not to place undue reliance on forward-looking statements, which speak only as of the date of this news release. We are not under any obligation, and we expressly disclaim any obligation, to update or alter any forward-looking statements, whether as a result of new information, future events, or otherwise.

The post Acquisition of Palm Mutual Water Company Complete appeared first on Cal Water.

“We appreciate the Greater Stockton Chamber of Commerce for this recognition, particularly as it reflects the dedication of our local team members who work every day to serve our Stockton customers, take care of the water system, keep the water safe and reliable, and strengthen the communities we have been proud to be part of,” said Craig Stevens, Cal Water's Stockton District Manager.

Cal Water, which began serving Stockton in 1927, has worked to enhance the quality of life for its local customers and communities for generations, with a sharp focus on quality, service, and value. Today, it is one of two water providers in the area, serving about 180,000 people. Its 56 local employees work to maintain nearly 525 miles of main, 24 wells, 8.8 million gallons of storage, and more than 3,055 hydrants to keep water safe, clean, and reliable in Stockton.

The Chamber's Business of the Year honor underscores the company's role as both an essential service provider and an engaged community partner, said Timm Quinn, Chief Executive Officer of the Greater Stockton Chamber of Commerce.

“Cal Water has demonstrated what it means to be a true community partner—delivering an essential service with reliability and professionalism while investing in the people, infrastructure, and partnerships that help Stockton thrive,” Quinn said.

In addition to its investment in local infrastructure—pipes, pumps, tanks, and more, Cal Water also gives back to the community through education scholarships; grants to local firefighters, most recently in 2025 to Stockton Fire Department; and community organizations such as the Emergency Food Bank, Animal Protection League, and Saint Mary's Dining Room.

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Importantly, the reports confirm that Cal Water met all primary and secondary federal and state drinking water quality standards in 2025. They also include information on local water supplies, testing, regulations, and current water quality-related hot topics. Customers without internet access may request a copy from their local Cal Water office.

"Delivering safe, clean, reliable drinking water is our top priority," said Sophie James, Vice President of Water Quality. "We treat and test the water to meet regulatory standards and monitor emerging requirements, so customers can have confidence in the water they use every day."

Cal Water supports water quality through:

• More than 600,000 annual water quality tests for over 300 contaminants in its state-certified laboratory.
• Investments in treatment technologies and infrastructure to remove contaminants from source water.
• Ongoing maintenance and upgrades to pumps, tanks, pipes, and other water system infrastructure.

The post Annual Water Quality Reports Now Available appeared first on Cal Water.

"Proactive infrastructure improvements like this are essential to maintaining a safe, reliable water system for our customers and the community," said Evan Markey, Cal Water's Chico District Manager. "By replacing and upgrading water mains before they become more difficult and costly to repair, we can help reduce the risk of service disruptions, support local fire protection needs, and continue delivering dependable water service for years to come."

Crews are working Monday through Friday between 7 a.m. and 5 p.m. on:

• Madrone Avenue, at the intersection of East 1st Avenue to Vallombrosa Avenue
• Cooks Way

The project is expected to be completed by October 2026. Customers in the immediate construction area will be notified of any brief water service interruptions required during the main installation. Crews will also make every effort to minimize traffic disruptions in the area.

Temporary asphalt will be applied until permanent paving is completed, which can be up to 30 days after project completion. This waiting period allows the trench to fully compact, helping provide a smoother road surface.

The project is part of Cal Water's ongoing commitment to responsibly invest in and maintain critical water infrastructure. Proactive improvements such as this help reduce future service interruptions, enhance fire protection, and continue providing safe, clean, reliable drinking water to the community.

The post Upgrade to Improve Supply Reliability in Chico appeared first on Cal Water.

"Protecting our customers' health and safety is our highest priority, and that begins with having infrastructure that is ready to meet their daily and emergency needs," said Mike Jasper, Westlake District Manager. "Proactively replacing aging water main allows us to continue delivering a reliable supply of safe, clean water to the community and local first responders before that infrastructure becomes unreliable."

During the first phase, crews are working on Arroyo Oaks Drive and Bridgewood Lane, Monday through Friday, between 8 a.m. and 4:30 p.m. The second phase will occur on Westlake Boulevard, just north of Hillcrest Drive. Customers in the immediate construction area will be notified of any brief water service interruptions required during the main installation. Crews will also make every effort to minimize traffic disruptions in the area.

Temporary asphalt will be applied until permanent paving is completed approximately 30 days after project completion. This waiting period allows the trench to fully compact, helping provide a smoother road surface when finished.

The project is part of Cal Water's Main Replacement Program, which focuses on proactively replacing aging infrastructure, while maximizing the existing infrastructure's life to help prevent small, manageable issues from getting bigger and more expensive to fix.

The post Thousand Oaks Water Infrastructure Upgrade appeared first on Cal Water.

"We've proudly served our customers for a century, and infrastructure upgrades like this one enable us to continue providing quality, service, and value-both now and for future generations. These projects improve the reliability of our water systems, so that we can provide water to our customers' homes any time of day or year," said Ralph Felix, Cal Water's Rancho Dominguez District Manager.

The district serves Carson, Hawthorne, Hermosa Beach, Redondo Beach, the Palos Verdes Peninsula, and portions of Compton, Harbor City, Long Beach, Lomita, and Torrance. "Our customers can count on having safe and clean water for their everyday use and emergency needs," Felix added.

Crews will be working on:

• South Helberta Avenue, from the 1300 block to the 1200 block
• South Helberta Avenue, from Avenue D to Palos Verdes Boulevard
• Avenue D, from the intersection of Avenue D to the 1300 block of South Helberta Avenue
• South Irena Avenue, from the intersection of South Irena Avenue and Palos Verdes Boulevard
• The intersection of South Irena Avenue to South Prospect Avenue
• Palos Verdes Avenue, from South Irena Avenue to South Prospect Avenue

Work is occurring Monday through Friday, from 9 a.m. to 3:30 p.m., and crews will work to minimize any disruption to traffic.

Temporary asphalt will be applied until permanent paving is completed, which can be up to 30 days after project completion.

The post Redondo Beach Water Infrastructure Upgrade Begins appeared first on Cal Water.

For the past 100 years, Cal Water's commitment to providing safe, clean, and reliable water to our customers has not waivered. This commitment doesn't happen by chance; it's the result of our dedicated professionals and proactive approach of investing in our infrastructure, water quality processes, emergency preparedness efforts, and more.

Infrastructure improvement planning

The California Public Utilities Commission (CPUC) recently finalized our 2024 Infrastructure Improvement Plan, which includes $1.45 billion in planned investments across our service areas as well as rate adjustments to help fund these important upgrades. Our rates are set by the CPUC after thorough analysis of our operations, service, and books-and with input from the public, so that rates reflect the current cost of operating and upgrading our water system.

This process involves a review of critical infrastructure needs across all Cal Water communities. These investments allow us to fund projects so we can continue delivering safe, clean, reliable water to more than two million Californians each day. They include installing new pipes, treatment facilities, pumps, fire hydrants, and more.

Water quality and emergency preparedness are at the core of our infrastructure upgrades

Each year, our experts conduct more than 600,000 water quality tests, screening for over 300 contaminants. From the source to the tap, we constantly monitor that our infrastructure improvements directly translate into the high-water quality our customers expect every day.

Even the best-maintained systems must be ready for the unforeseen. That's why Cal Water has built an emergency preparedness strategy designed to keep our systems running and our communities protected. When conditions are at their most challenging, whether due to natural disasters or other unexpected events, proactive upgrades help us deliver safe, clean drinking water, and improve emergency readiness.

Much of this work begins long before an emergency strikes. We regularly inspect and upgrade our fire hydrants, replace aging and high-risk water mains, and reconfigure pipelines in certain areas to maximize flow. Additionally, we install generators at key facilities to help keep our infrastructure operating properly if power is lost or shut off.

We've also made significant investments in increasing water storage capacity, upgrading pump stations, and expanding remote monitoring capabilities. These improvements give our operations teams real-time visibility into system performance.

In conjunction with our emergency preparedness strategy, we also work closely with local fire departments and cities. In 2025, we granted over $186,000 to help nine fire departments pay for life-saving equipment, bringing the total amount provided to fire departments to $1,204,000 since our Firefighter Grant Program started in 2019.

Supporting customers in managing their bills

We understand that financial hardship can make even an essential utility bill difficult to manage. At Cal Water, we offer a range of financial assistance programs designed to meet customers where they are.

Our Customer Assistance Program provides a monthly discount to eligible low-income households on their water bill, helping to ease the burden for families who need it most.

For customers carrying a past-due balance, our PromisePay payment arrangement program offers an interest-free path forward. Rather than facing the stress of an overdue bill alone, customers can work with us to establish a manageable, flexible payment plan on their terms.

We also offer conservation programs and rebates to help customers save water at home that can lead to savings. Our Conservation Kits provide customers with free water-saving fixtures such as high-efficiency showerheads and faucet aerators. Additional rebates are available for upgrading to high-efficiency toilets, clothes washers, smart irrigation controllers, and other devices.

For outdoor savings, our free Smart Landscape Tune-Up program offers a professional evaluation of residential irrigation systems and provides for the installation of efficient devices. Customers can also take advantage of our Lawn-to-Garden program and earn a per-square-foot rebate for replacing grass with water-wise, California-native plants.

At Cal Water, we're committed to our purpose of enhancing the quality of life for our customers and communities that has guided us for the past century. For more information on our Infrastructure Improvement Plan, community-specific investments, and financial assistance programs, visit the Infrastructure Improvement Plan page.

The post Investing in Infrastructure, Quality, and Our Customers appeared first on Cal Water.

"We proactively upgrade our water systems and perform ongoing maintenance to keep our systems reliable, because the community depends on the water we provide for their everyday and emergency needs. That's something we take seriously," said Dawn Smithson, Cal Water's Los Altos Suburban District Manager. "This approach has allowed us the privilege of serving customers for 100 years, and it will enable us to continue providing quality, service, and value for the next 100 years."

Crews will be working on Barbara Avenue, from Miramonte Avenue to Brookdale Avenue, and Isabelle Avenue, from Marilyn Drive to Barbara Avenue, Monday through Friday, from 7 a.m. to 4 p.m., with temporary lane closures from 9 a.m. to 3 p.m. Crews will work to minimize traffic disruption. The infrastructure upgrade is expected to be completed in October.

Temporary asphalt will be applied until permanent paving is completed, which can be up to 30 days after project completion.

The project is part of Cal Water's Main Replacement Program, which focuses on proactively replacing aging infrastructure, while maximizing the existing infrastructure's life to help prevent small, manageable issues from getting bigger and more expensive to fix.

The post Mountain View Infrastructure Upgrade Begins appeared first on Cal Water.

Work on the first project is occurring in northern Menlo Park, where crews are installing 3,695 feet of new six-, eight-, and 12-inch main. Construction is expected to be completed in July. The second project is happening in central Menlo Park, where crews are installing 5,605 feet of new six-, eight-, and 12-inch water main. This project is expected to be completed by January 2027.

"These upgrades are all about improving water service reliability for our customers' daily needs and supporting our local first responders as they work to protect our community," said Dawn Smithson, Cal Water's Bear Gulch District Manager. "Our proactive infrastructure improvement projects are undertaken to provide quality, service, and value to the communities we serve."

In northern Menlo Park, work is being done Monday through Friday, from 8 a.m. to 5 p.m. along Bay Road, from Peggy Lane to Greenwood Drive, just west of Flood Park. In central Menlo Park, work is occurring from 8 a.m. to 5 p.m. in the following three phases with the exception of University Drive, which will require road closures from 9 a.m. to 3 p.m. and customers will be notified.

Phase one: Along University Drive and El Camino Real, from Harvard Avenue to Partridge Avenue.

Phase two: Along University Drive, from Partridge Avenue to Creek Drive.

Phase three: Along University Drive, from Middle Avenue to Patridge Avenue.

Crews will work to minimize any disruption to traffic. Temporary asphalt will be applied until permanent paving is completed, which can be up to 30 days after project completion.

The projects are part of Cal Water's Main Replacement Program, which focuses on proactively replacing aging infrastructure, while maximizing the existing infrastructure's life to help prevent small, manageable issues from getting bigger and more expensive to fix.

The post Two Water Infrastructure Upgrades in Menlo Park appeared first on Cal Water.

The G480 framework outlines the key components of an effective water conservation and water-use efficiency program. It covers utility efforts to improve water use in terms of both supply-through planning and distribution system management, and demand-through strategies such as billing and customer education. Programs that meet this standard are able to benefit all water users and serve as a benchmark for developing and evaluating utility conservation efforts. Platinum certification verifies that a utility's water conservation program meets 100 percent of the compliance requirements outlined in the voluntary standard. Cal Water is the first utility to earn the platinum certification under the newly updated standard, labeled G480-25.

"As a 100-year-old company, our long-term success has been grounded in our commitment to responsible long-term planning, high-quality service, care for our communities, and stewardship of our limited natural resources," said Marty Kropelnicki, Cal Water Chairman and CEO. "From our urban water supply planning and stringent water loss control measures to our customer conservation incentive programs, our data-driven sustainability efforts will help keep our communities thriving into our next century."

“We are pleased to be recognized by AWE with the G480 Platinum Certification as a testament to our robust, industry-leading program,” Kropelnicki said of the designation presented to Cal Water representatives at the CalWEP Peer-to-Peer conference held last week.

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