[GRAPHIC OMITTED]                 NEWS RELEASE
                         CALIFORNIA WATER SERVICE GROUP         [OBJECT OMITTED]


             1720 North First Street
             San Jose, CA 95112-4598                           September 28,2005

Contact:     Shannon Dean  (310) 257-1435


              JOHN S. TOOTLE NAMED ACTING CHIEF FINANCIAL OFFICER;
                  RICHARD D. NYE PLACED ON ADMINISTRATIVE LEAVE
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SAN  JOSE,  CA - The  California  Water  Service  Group  (NYSE : CWT)  Board  of
Directors today named John S. Tootle as Acting Vice  President,  Chief Financial
Officer  and  Treasurer  and  placed  Richard  D.  Nye on  administrative  leave
following civil litigation filed against Nye by the U.S. Securities and Exchange
Commission (SEC); the SEC's  allegations  against Nye relate solely to his prior
positions  at another  company  and have no  relationship  to  California  Water
Service Group.

     Tootle served as California Water Service Group's  Corporate  Counsel prior
to assuming this position. He joined the company in May of 2000 when it acquired
Dominguez Services  Corporation,  where he had served as Chief Financial Officer
since 1987.  Before joining  Dominguez  Services  Corporation's  executive team,
Tootle served as Chief Financial Officer for United Business  Interiors,  Senior
Internal    Auditor    for    Republic    Corporation,     and    Auditor    for
PricewaterhouseCoopers.  An attorney and certified public accountant,  he brings
more than 25 years of financial experience to the position.

     Peter C. Nelson,  President and Chief Executive  Officer,  said,  "This SEC
action relates solely to another  company.  Cal Water has always  maintained the
highest standards for its internal controls and financial reporting. We received
an unqualified  opinion from our  independent  auditors  regarding  management's
assessment of our internal  controls for the year ending  December 31, 2004. Our
controls  are  documented  and  tested  throughout  the  year.  Separately,  our
independent  auditors issued an unqualified opinion on our financial  statements
for  2004.  I am  confident  in our  ability  to  continue  to meet the  highest
standards in our financial management of the Company."



     California  Water Service Group is the parent  company of California  Water
Service  Company,  Washington  Water Service  Company,  New Mexico Water Service
Company, Hawaii Water Service Company, Inc., and CWS Utility Services.  Together
these companies provide regulated and non-regulated water service to more than 2
million  people  in  100  California,   Washington,   New  Mexico,   and  Hawaii
communities.  Group's  common stock trades on the New York Stock  Exchange under
the symbol "CWT."

     This news release contains  forward-looking  statements  within the meaning
established by the Private Securities Litigation Reform Act of 1995 ("Act"). The
forward-looking  statements  are  intended to qualify  under  provisions  of the
federal  securities  laws for "safe harbor"  treatment  established  by the Act.
Forward-looking   statements  are  based  on  currently  available  information,
expectations,  estimates, assumptions and projections, and management's judgment
about the Company,  the water utility industry and general economic  conditions.
Such  words  as  expects,   intends,   plans,  believes,   estimates,   assumes,
anticipates,  projects,  predicts,  forecasts  or  variations  of such  words or
similar  expressions are intended to identify  forward-looking  statements.  The
forward-looking  statements are not guarantees of future  performance.  They are
subject to  uncertainty  and changes in  circumstances.  Actual results may vary
materially from what is contained in a forward-looking  statement.  Factors that
may cause a result different than expected or anticipated include:  governmental
and regulatory commissions' decisions, including decisions on proper disposition
of property;  changes in regulatory  commissions'  policies and procedures;  the
timeliness  of  regulatory  commissions'  actions  concerning  rate relief;  new
legislation;  the ability to satisfy  requirements related to the Sarbanes-Oxley
Act and other regulations on internal  controls;  electric power  interruptions;
increases in suppliers' prices and the availability of supplies  including water
and power;  fluctuations in interest rates; changes in environmental  compliance
and water quality  requirements;  acquisitions  and our ability to  successfully
integrate  acquired  companies;  the ability to successfully  implement business
plans;  changes in customer  water use patterns;  the impact of weather on water
sales and operating results; access to sufficient capital on satisfactory terms;
civil  disturbances  or terrorist  threats or acts,  or  apprehension  about the
possible future  occurrences of acts of this type; the involvement of the United
States in war or other hostilities;  restrictive  covenants in or changes to the
credit  ratings on our current or future debt that could  increase our financing
costs or affect our ability to borrow,  make payments on debt or pay  dividends;
and,  other  risks  and  unforeseen  events.  When  considering  forward-looking
statements,  you should keep in mind the cautionary  statements included in this
paragraph.  The  Company  assumes no  obligation  to provide  public  updates of
forward-looking statements.  Additional information is available at our Web site
at www.calwatergroup.com.

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