Table of Contents Large accelerated filer ☒ Accelerated filer ☐ Non-accelerated filer ☐ Smaller reporting company ☐ Emerging growth company ☐ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission fil ...

Financial Performance - Operating revenue for the three months ended March 31, 2020, was $125,563,000, a decrease of 0.4% from $126,111,000 in the same period of 2019[14]. - Net loss for the three months ended March 31, 2020, was $20,307,000, compared to a net loss of $7,640,000 in the same period of 2019, representing a significant increase in losses[14]. - The company reported a basic loss per share of $0.42 for the three months ended March 31, 2020, compared to a loss of $0.16 per share in the same period of 2019[14]. - The net loss for Q1 2020 was $20.3 million, compared to a net loss of $7.6 million in Q1 2019, indicating a significant increase in losses[63]. - The company reported a net loss of $20,307,000 in Q1 2020, compared to a net loss of $7,640,000 in Q1 2019, indicating a worsening financial position[104]. Revenue and Expenses - Total operating expenses for Q1 2020 were $132,486,000, compared to $125,635,000 in Q1 2019, indicating an increase of about 5.5%[104]. - Revenue from contracts with customers increased to $134,833 for the three months ended March 31, 2020, compared to $117,410 in the same period of 2019, reflecting a growth of 14.8%[32]. - Residential customer revenue rose to $92,544 for the three months ended March 31, 2020, up from $84,259 in 2019, marking an increase of 9.5%[32]. - Non-regulated revenue decreased to $3,827 for the three months ended March 31, 2020, down from $4,901 in the same period of 2019, a decline of 21.9%[40]. - Water production costs increased to $53,976,000 in Q1 2020 from $45,592,000 in Q1 2019, representing an increase of approximately 18.4%[104]. Assets and Liabilities - Total assets as of March 31, 2020, were $3,240,845,000, an increase from $3,111,308,000 as of December 31, 2019[13]. - Total current liabilities rose to $513,127,000 as of March 31, 2020, compared to $358,721,000 as of December 31, 2019, indicating increased short-term financial obligations[12]. - Long-term debt, including current maturities, was valued at $989.7 million as of March 31, 2020, compared to $873.5 million as of December 31, 2019, reflecting an increase of approximately 13.3%[94]. - The outstanding borrowings on the company line of credit were $105.1 million as of March 31, 2020, up from $55.1 million at the end of 2019[72]. - Total liabilities and capitalization as of March 31, 2020, were $3,240,845,000, consistent with total assets, reflecting a balanced financial position[100][102]. Cash Flow - Net cash provided by operating activities was $4,067,000 for the three months ended March 31, 2020, a decrease from $20,141,000 in the same period of 2019[16]. - Cash contributions to pension plans were $7.9 million in Q1 2020, compared to $0 in Q1 2019[66]. - Net cash provided by financing activities in Q1 2020 was $158,901,000, compared to $52,915,000 in Q1 2019, showing an increase of about 199%[110]. - Cash, cash equivalents, and restricted cash at the end of Q1 2020 amounted to $140,996,000, up from $60,890,000 at the end of Q1 2019, representing an increase of approximately 131%[110]. - Net cash used in investing activities for Q1 2020 was $65,270,000, a significant increase from $59,881,000 in Q1 2019, indicating a rise of approximately 9%[110]. Regulatory and Legal Matters - The Company did not record amounts for the Water Revenue Adjustment Mechanism (WRAM) and other regulatory balancing accounts for the first three months of 2020 due to ongoing litigation[37]. - The company recognized a liability of $2.0 million for known legal matters as of March 31, 2020, down from $2.5 million as of December 31, 2019, a decrease of 20%[89]. - The company is involved in litigation related to groundwater contamination, with costs expensed as incurred, and proceeds from litigation to be used for customer reimbursements and treatment costs[88]. - The company recorded a regulatory liability for the Conservation Expense Balancing Account (CEBA) for the first three months of 2020, as it met the regulatory liability recognition criteria[37]. - The company expects segments of its customer base to experience difficulties in paying utility bills due to the COVID-19 pandemic, leading to adjustments in the allowance for credit losses[44]. Capital Expenditures - Utility plant expenditures in Q1 2020 totaled $65,270,000, compared to $59,881,000 in Q1 2019, reflecting an increase of approximately 9%[110]. - The company anticipates capital investments of approximately $809.0 million to $828.0 million in the 2019-2021 period if the settlement agreement is approved[80]. - As of March 31, 2020, construction work in progress amounted to $271.3 million[171]. - Advances for construction were valued at $82.1 million as of March 31, 2020, up from $79.6 million as of December 31, 2019, indicating a growth of about 3.1%[94]. - The company has significant commitments to purchase water from wholesalers, with no significant changes reported as of March 31, 2020, compared to December 31, 2019[86].

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Title of Each Class: Trading Symbol(s) Name of Each Exchange on Which Registered: Common Stock, $0.01 par value per share CWT New York Stock Exchange Large accelerated Filer ☒ Accelerated filer ☐ Non-accelerated filer ☐ Smaller reporting company ☐ Emerging growth company ☐ Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 OR ☐ TRANSITION REPORT P ...

Table of Contents Title of Each Class: Trading Symbol(s) Name of Each Exchange on Which Registered: Large accelerated Filer ☒ Accelerated filer ☐ Non-accelerated filer ☐ Smaller reporting company ☐ Emerging growth company ☐ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) ...

Table of Contents Title of Each Class: Trading Symbol(s) Name of Each Exchange on Which Registered: Large accelerated Filer ☒ Accelerated filer ☐ Non-accelerated filer ☐ Smaller reporting company ☐ Emerging growth company ☐ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF TH ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 or o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-13883 CALIFORNIA WATER SERVICE GROUP (Exact name of registrant as specified in its charter) of incorporation or ...

Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 OR o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file No. 1-13883 CALIFORNIA WATER SERVICE GROUP (Exact name of registrant as ...