CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in this Registration Statement on Form S-3 of our report dated February 28, 2019, relating to the consolidated financial statements of California Water Service Group, and the effectiveness of California Water Service Group's internal control over financial reporting (which report expresses an adverse opinion on the effectiveness of the Company's internal control over financial reporting because of a material weakness), appearing in or incorporated by reference in the Annual Report on Form 10-K of California Water Service Group for the year ended December 31, 2018, and to the reference to us under the heading "Experts" in the Prospectus, which is part of this Registration Statement.
/s/ DELOITTE & TOUCHE LLP
San Francisco, California
October 31, 2019