California Water Service Group Promotes Tim Treloar to Chief Utility Operations Officer and Michael Luu to Chief Information Officer

SAN JOSE, CA -- (Marketwired) -- 11/30/16 -- California Water Service Group (NYSE: CWT) today announced the promotion of Timothy D. Treloar from Vice President of Operations to Vice President of Water Quality and Chief Utility Operations Officer, and Michael B. Luu from Vice President of Customer Service & Information Technology to Vice President of Customer Service and Chief Information Officer, effective January 1, 2017.

Treloar joined the company in 1994, and has held several management positions, including District Manager and Director of Water Quality. He was named to his current position in August 2013. In his new position, Treloar will assume responsibility for water quality and water, wastewater, and recycled water operations Group-wide.

Luu was also appointed to his current position in August 2013. Since joining the company in 1999, he has served in a number of capacities, including Information Technology Applications Manager and Director of Information Technology, Enterprise Systems. As Vice President of Customer Service and Chief Information Officer, Luu will be responsible for customer service and all information technology strategy, architecture, and applications, including cyber security, for all of Group's operations.

"Tim and Michael have both made outstanding contributions to our Company, including how we operate to better serve our customers. Both of their areas of responsibility have become increasingly complex and critical to our long-term strategy and overall success. I congratulate them both on these well-deserved promotions and look forward to working with them in their expanded roles," said Martin A. Kropelnicki, President and Chief Executive Officer.

California Water Service Group is the parent company of California Water Service, Washington Water Service, New Mexico Water Service, Hawaii Water Service, CWS Utility Services, and HWS Utility Services. Together, these companies provide regulated and non-regulated water service to nearly 2 million people in California, Washington, New Mexico, and Hawaii. California Water Service was ranked "Highest in Customer Satisfaction Among Water Utilities in the West" in 2016 by J.D. Power in its inaugural Water Utility Residential Customer Satisfaction Study. California Water Service Group's common stock trades on the New York Stock Exchange under the symbol "CWT." Additional information is available on our website at www.calwatergroup.com.

This news release contains forward-looking statements within the meaning established by the Private Securities Litigation Reform Act of 1995 ("Act"). The forward-looking statements are intended to qualify under provisions of the federal securities laws for "safe harbor" treatment established by the Act. Forward-looking statements are based on currently available information, expectations, estimates, assumptions and projections, and management's judgment about the Company, the water utility industry and general economic conditions. Such words as would, expects, intends, plans, believes, estimates, assumes, anticipates, projects, predicts, forecasts or variations of such words or similar expressions are intended to identify forward-looking statements. The forward-looking statements are not guarantees of future performance. They are subject to uncertainty and changes in circumstances. Actual results may vary materially from what is contained in a forward-looking statement. Factors that may cause a result different than expected or anticipated include, but are not limited to: governmental and regulatory commissions' decisions; changes in regulatory commissions' policies and procedures; success by non-settling parties in opposing the settlement; the timeliness of regulatory commissions' actions concerning rate relief; electric power interruptions; increases in suppliers' prices and the availability of supplies including water and power; changes in environmental compliance and water quality requirements; changes in customer water use patterns; the impact of weather on water sales and operating results; our access to sufficient capital on satisfactory terms; civil disturbances or terrorist threats or acts interfering with our facilities or operations, or apprehension about the possible future occurrences of acts of this type; restrictive covenants in or changes to the credit ratings on our current or future debt that increase our financing costs or affect our ability to borrow, make payments on debt or pay dividends; and, other risks and unforeseen events. When considering forward-looking statements, you should keep in mind the cautionary statements included in this paragraph, as well as the annual 10-K, Quarterly 10-Q, and other reports filed from time-to-time with the Securities and Exchange Commission (SEC). The Company assumes no obligation to provide public updates of forward-looking statements.

Released November 30, 2016