Investor Presentaiton

CALIFORNIA WATER SERVICE GROUP INVESTING FOR LIFE PFAS Regulation In March, the US EPA published a set of draft Maximum Contaminant Levels (MCLs) for PFAS compounds Based on current information, if the regulation is adopted in its current form, we estimate capital investments of approximately $200M would be needed to comply The draft regulation, if unchanged, would require compliance by 2026 While our regulators have a strong track record of allowing recovery for water treatment investments, there are also other potential sources of funds which could offset some or all of the investment over time INVESTOR RELATIONS 13

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