Exhibit 99.1 California Water Service Group’s First Quarter 2024 Financial Results Benefit from California 2021 General Rate Case Decision San Jose, Calif. California Water Service Group (“Group” or “Company,” NYSE: CWT), a leading publicly traded water utility serving California, Hawaii, New Mexico, Washington, and Texas, today reported results for the first quarter of 2024. Highlights included: ● Diluted earnings per share of $1.21 in Q1 2024, compared to a loss of$0.40 in Q1 2023. ● A decision on the 20 ...