EXHIBIT 31.2

Exhibit 31.2

CERTIFICATIONS

I, John S. Tootle, Acting Chief Financial Officer and Treasurer of California
Water Service Group, certify that:

1. I have reviewed this Annual Report on Form 10-K for the year ended
December 31, 2005, of California Water Service Group;

2. Based on my knowledge, this report does not contain any untrue statement
of a material fact or omit to state a material fact necessary to make the
statements made, in light of the circumstances under which such statements were
made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial
information included in this report, fairly present in all material respects the
financial condition, results of operations and cash flows of the registrant as
of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for
establishing and maintaining disclosure controls and procedures (as defined in
Exchange Act Rules 13a-15(e) and 15(d)-15(e)) and internal control over
financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15(d)-15(f))
for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such
disclosure controls and procedures to be designed under our supervision, to
ensure that material information relating to the registrant, including its
consolidated subsidiaries, is made known to us by others within those
entities, particularly during the period in which this report is being
prepared;

b. Designed such internal control over financial reporting, or caused
such internal control over financial reporting to be designed under our
supervision, to provide reasonable assurance regarding the reliability of
financial reporting and the preparation of financial statements for
external purposes in accordance with generally accepted accounting
principles;

c. Evaluated the effectiveness of the registrant's disclosure controls
and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of
the period covered in this report based on such evaluation; and

d. Disclosed in this report any change in the registrant's internal
control over financial reporting that occurred during the fourth fiscal
quarter of 2005 that has materially affected, or is reasonably likely to
materially affect, the registrant's internal control over financial
reporting; and

5. The registrant's other certifying officer and I have disclosed, based on
our most recent evaluation of internal control over financial reporting, to the
registrant's auditors and the audit committee of the registrant's board of
directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or
operation of internal control over financial reporting which are reasonably
likely to adversely affect the registrant's ability to record, process,
summarize and report financial information; and


b. Any fraud, whether or not material, that involves management or other
employees who have a significant role in the registrant's internal control over
financial reporting.


Date: March 9, 2006 By: /s/ John S. Tootle
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JOHN S. TOOTLE
Acting Chief Financial Officer and Treasurer
California Water Service Group