Form: 424B5

Prospectus [Rule 424(b)(5)]

May 14, 2025

Documents

S-3 424B5 EX-FILING FEES 333-287273 0001035201 CALIFORNIA WATER SERVICE GROUP The prospectus is not a final prospectus for the related offering. Y N 0001035201 2025-05-14 2025-05-14 0001035201 1 2025-05-14 2025-05-14 0001035201 1 2025-05-14 2025-05-14 0001035201 2 2025-05-14 2025-05-14 iso4217:USD xbrli:pure xbrli:shares

Calculation of Filing Fee Tables

S-3

CALIFORNIA WATER SERVICE GROUP

Table 1: Newly Registered and Carry Forward Securities

Security Type

Security Class Title

Fee Calculation or Carry Forward Rule

Amount Registered

Proposed Maximum Offering Price Per Unit

Maximum Aggregate Offering Price

Fee Rate

Amount of Registration Fee

Carry Forward Form Type

Carry Forward File Number

Carry Forward Initial Effective Date

Filing Fee Previously Paid in Connection with Unsold Securities to be Carried Forward

Newly Registered Securities
Fees to be Paid 1 Equity Common Stock, par value $0.01 per share 457(o) 35,000,000,000 $ 350,000,000.00 0.0001531 $ 53,585.00
Fees Previously Paid
Carry Forward Securities
Carry Forward Securities

Total Offering Amounts:

$ 350,000,000.00

$ 53,585.00

Total Fees Previously Paid:

$ 0.00

Total Fee Offsets:

$ 3,993.53

Net Fee Due:

$ 49,591.47

Offering Note

1

In accordance with Rules 456(b) and 457(r) under the Securities Act of 1933, as amended (the "Securities Act"), the registrant initially deferred payment of all of the registration fees for the registrant's registration statement on Form S-3, filed by the registrant on May 14, 2025. The filing fee of $53,585 is calculated in accordance with Rule 457(o), based on the proposed maximum aggregate offering price, and Rule 457(r) of the Securities Act. The amount of securities to be registered consists of $350,000,000 of an indeterminate number or amount of shares of common stock of California Water Service Group, estimated solely for the purpose of calculating the registration fee pursuant to Rule 457(o) under the Securities Act.

Table 2: Fee Offset Claims and Sources

Registrant or Filer Name Form or Filing Type File Number Initial Filing Date Filing Date Fee Offset Claimed Security Type Associated with Fee Offset Claimed Security Title Associated with Fee Offset Claimed Unsold Securities Associated with Fee Offset Claimed Unsold Aggregate Offering Amount Associated with Fee Offset Claimed Fee Paid with Fee Offset Source
Rules 457(b) and 0-11(a)(2)
Fee Offset Claims
Fee Offset Sources
Rule 457(p)
Fee Offset Claims 1 California Water Service Group S-3 333-264542 04/29/2022 $ 3,993.53 Equity Common Stock, par value $0.01 per share $ 43,080,150.65
Fee Offset Sources 2 California Water Service Group S-3 333-264542 04/29/2022 $ 3,993.53

Rule 457(p) Statement of Withdrawal, Termination, or Completion:

1

The registrant has previously registered the offer and sale of up to $350,000,000 of securities pursuant to a prospectus supplement filed on April 29, 2022 (the "April 2022 Prospectus Supplement") to the registration statement on Form S-3 (File No. 333-264542), which was initially filed with the Securities and Exchange Commission and became effective on April 28, 2022. In connection with the April 2022 Prospectus Supplement, the registrant made a contemporaneous fee payment in the amount of $32,445.00. Of the $350,000,000 of securities registered under the April 2022 Prospectus Supplement, $43,080,150.65 remains unsold (the "Unsold Securities"). Pursuant to Rule 457(p) under the Securities Act, the registration fee of $3,993.53 that has already been paid and remains unused with respect to the Unsold Securities is hereby offset against the registration fee of $53,585.00 due for this offering. The offering that includes the Unsold Securities under the April 2022 Prospectus Supplement is hereby terminated.

Offset Note

2

The registrant has previously registered the offer and sale of up to $350,000,000 of securities pursuant to a prospectus supplement filed on April 29, 2022 (the "April 2022 Prospectus Supplement") to the registration statement on Form S-3 (File No. 333-264542), which was initially filed with the Securities and Exchange Commission and became effective on April 28, 2022. In connection with the April 2022 Prospectus Supplement, the registrant made a contemporaneous fee payment in the amount of $32,445.00. Of the $350,000,000 of securities registered under the April 2022 Prospectus Supplement, $43,080,150.65 remains unsold (the "Unsold Securities"). Pursuant to Rule 457(p) under the Securities Act, the registration fee of $3,993.53 that has already been paid and remains unused with respect to the Unsold Securities is hereby offset against the registration fee of $53,585.00 due for this offering. The offering that includes the Unsold Securities under the April 2022 Prospectus Supplement is hereby terminated.