EXHIBIT 31.2

Exhibit 31.2
CERTIFICATIONS

I, Richard D. Nye, Chief Financial Officer and Treasurer of California Water
Service Group, certify that:

1. I have reviewed this Form 10-Q for the quarter ended June 30, 2004 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 periods 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 15d-15(e)) 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. 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 by this report based on such evaluation; and

c. Disclosed in this report any change in the registrant's internal control
over financial reporting that occurred during the second fiscal quarter of
2004 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: August 6, 2004 By: /s/ RICHARD D. NYE
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RICHARD D. NYE
Chief Financial Officer and Treasurer
California Water Service Group