EIGHTH  SUPPLEMENTAL  INDENTURE,  dated as of December 1, 1996, between
CITIZENS  UTILITIES COMPANY, a corporation duly organized and existing under the
laws of the  State  of  Delaware  (herein  called  the  "Company"),  having  its
principal  administrative  offices at High Ridge Park, Building No. 3, Stamford,
Connecticut  06905,  to THE CHASE  MANHATTAN  BANK  (formerly  known as Chemical
Bank), a New York banking corporation, as Trustee (herein called the "Trustee"),
having its principal  corporate trust office at 450 West 33rd Street,  New York,
New York 10001.
                                    RECITALS
         WHEREAS,  the Company has entered into an Indenture  dated as of August
15, 1991 (the  "Indenture"),  with the Trustee to provide for the issuance  from
time  to  time  of  the  Company's  debentures,  notes  or  other  evidences  of
indebtedness  (herein  called  the  "Securities"),  to be  issued in one or more
series; and
         WHEREAS,  the Company has entered into a First  Supplemental  Indenture
dated as of  August  15,  1991 (the  "First  Supplemental  Indenture")  with the
Trustee to  establish  the form and terms of a series of  Securities  designated
"8.45% Debentures Due 2001"; and
         WHEREAS,  the Company has entered into a Second Supplemental  Indenture
dated as of January  15, 1992 (the  "Second  Supplemental  Indenture")  with the
Trustee to  establish  the form and terms of a series of  Securities  designated
"7.45%  Debentures Due 2004"; and



                                       


         WHEREAS,  the Company has entered into a Third Supplemental  Indenture 
dated as of April 15, 1994 (the "Third Supplemental Indenture") with the Trustee
to  establish  the form and terms of a series of  Securities  designated  "7.60%
Debentures Due 2006"; and
         WHEREAS,  the Company has entered into a Fourth Supplemental  Indenture
dated as of  October  1, 1994 (the  "Fourth  Supplemental  Indenture")  with the
Trustee to  establish  the form and terms of a series of  Securities  designated
"7.68% Debentures Due 2034"; and
         WHEREAS,  the Company has entered into a Fifth  Supplemental  Indenture
dated as of June 15, 1995 (the "Fifth Supplemental  Indenture") with the Trustee
to  establish  the form and terms of a series of  Securities  designated  "7.45%
Debentures Due 2035"; and
         WHEREAS,  the Company has entered into a Sixth  Supplemental  Indenture
dated as of October  15,  1995 (the  "Sixth  Supplemental  Indenture")  with the
Trustee to establish the form and terms of a series of Securities designated "7%
Debentures Due 2025"; and
         WHEREAS, the Company has entered into a Seventh Supplemental  Indenture
dated as of June 1, 1996 (the "Seventh Supplemental Indenture") with the Trustee
to  establish  the form and terms of a series of  Securities  designated  "6.80%
Debentures Due 2026"; and
         WHEREAS,  Section 901 of the  Indenture  provides,  among other things,
that the Company and the Trustee may enter into  indentures  supplemental to the
Indenture  for,  among other things, 


                                       2


the purpose of  establishing  the form and terms of the Securities of any series
as  permitted  in  Sections  201  and 301 of the  Indenture  and  adding  to the
covenants  of the  Company  for the  benefit  of the  Holders  of any  series of
Securities; and
         WHEREAS,  the Company by corporate action duly taken has authorized the
issuance of an eighth  series of Securities  designated as the 7.05%  Debentures
Due 2046  (hereinafter  sometimes  called  the  "Debentures"),  which  series is
limited in  aggregate  principal  amount to  $200,000,000,  such  Debentures  to
contain  such  provisions  as have  been  caused to be  determined  by or at the
direction of, the Board of Directors of the Company and as are set forth in this
Eighth Supplemental Indenture to the Indenture; and
         WHEREAS,  all conditions have been complied with, all actions have been
taken and all things have been done which are necessary to make the  Debentures,
when  executed by the Company and  authenticated  by or on behalf of the Trustee
and  when  delivered  as  herein  and  in  the  Indenture  provided,  the  valid
obligations  of the Company,  and to make this Eighth  Supplemental  Indenture a
valid and binding supplemental indenture.
         NOW, THEREFORE, THIS EIGHTH SUPPLEMENTAL INDENTURE WITNESSETH:



                                       3


         For  and in  consideration  of the  premises  and the  purchase  of the
Debentures by the holders thereof, it is mutually covenanted and agreed, for the
equal and proportionate benefit of all holders of the Debentures, as follows:
         Section 1.  Definitions.   For all purposes of this Eighth Supplemental
                     ------------
Indenture,  except as otherwise herein expressly  provided or unless the context
otherwise requires:
              (1) terms used herein in  capitalized  form and defined in the
                  Indenture shall have the meanings  specified in the Indenture;
              (2) the words "herein",  "hereof" and "hereto" and other words
                  of similar import used in this Eighth  Supplemental  Indenture
                  refer to this Eighth Supplemental Indenture as a whole and not
                  to any particular  Section or other subdivision of this Eighth
                  Supplemental  Indenture;  
              (3) the  provisions  of this  Eighth Supplemental  Indenture shall
                  be read in  conjunction  with the  provisions of the Indenture
                  only with respect to the  Debentures and the provisions of the
                  Indenture and the First, Second,  Third, Fourth,  Fifth, Sixth
                  and Seventh  Supplemental  Indentures shall not be modified by
                  this Eighth Supplemental  Indenture with respect to any series
                  of


                                       4


                  the  Securities  outstanding  or to be  outstanding  under the
                  Indenture, other than the Debentures; and
              (4) terms defined in this Eighth Supplemental Indenture shall 
                  apply  only  to this  Eighth  Supplemental  Indenture  and the
                  Debentures hereunder,  and such definitions shall not apply to
                  any supplemental indenture other than this Eighth Supplemental
                  Indenture  or  to  any   Securities   outstanding   or  to  be
                  outstanding under the Indenture, other than the Debentures.
         Except as otherwise  expressly provided or unless the context otherwise
requires,  "Eighth  Supplemental  Indenture" means this instrument as originally
executed or, if amended or supplemented pursuant to the applicable provisions of
the Indenture, as amended or supplemented.
         Section  2.  Forms  of  the  Debentures.  The  Debentures  shall  be in
                      ---------------------------
substantially  the  form set  forth in  Exhibit  A to this  Eighth  Supplemental
Indenture, as such form may be completed pursuant to Section 3 hereof, the terms
of which Exhibit A are herein  incorporated by reference and made a part of this
Eighth Supplemental Indenture.
         Section 3.  Terms of the Debentures.  The terms of the Debentures shall
                     ------------------------
 be as follows:


                                       5


                  (1) the  Securities  to be issued under the Indenture and this
Eighth Supplemental Indenture shall be the Debentures and shall be designated as
the "7.05% Debentures Due 2046";
                  (2) the Debentures shall constitute a single series of the
Securities under the Indenture,  which series is limited in aggregate  principal
amount to $200,000,000;
                  (3) so long as any  Debentures  are  registered in the name of
CEDE & Co.,  or any other  nominee  of The  Depository  Trust  Company,  and are
intended  to be  Book-Entry  Securities,  the  provisions  of Section 311 of the
Indenture  shall apply to such  Debentures.  Thereafter  the  Debentures  may be
subjected to the requirements of a successor  book-entry  securities system that
may be adopted by the Company in accordance with the provisions of the Indenture
and this Eighth Supplemental Indenture;
                  (4) interest on each of the Debentures shall be payable at the
rate per annum  specified in the  designation  of the Debenture from December 6,
1996, or from the most recent  Interest  Payment Date to which interest has been
paid or duly provided for, semi-annually, on April 1 and October 1 in each year,
commencing on April 1, 1997.  The interest so payable,  and  punctually  paid or
duly  provided  for, on any Interest  Payment Date will be paid to the Person in
whose name such Debenture (or one or more Predecessor  Securities) is registered
at the close of


                                       6


business on the Regular Record Date for such interest,  which shall be the March
15 or  September  15 (whether or not a Business  Day),  as the case may be, next
preceding  such Interest  Payment Date.  Any interest not so punctually  paid or
duly  provided  for will  forthwith  cease to be  payable  to the Holder on such
Regular  Record Date by virtue of having been such a Holder and shall be paid by
the Company as provided in Section 307 of the Indenture;
                  (5) unless  otherwise  provided  with respect to a Book- Entry
Security or  pursuant to any  successor  book-entry  security  system or similar
system,  payments of interest will be made by check mailed to the Holder of each
Debenture at the address shown in the Security Register or, at the option of the
Holder,  to such other place in the United States of America as the Holder shall
designate to the Trustee in writing. The principal amount of the Debentures will
be paid at Maturity  by check  against  presentation  of the  Debentures  at the
office or agency of The Chase Manhattan Bank, as Trustee, in New York, New York,
or such other address in New York,  New York, as the Trustee shall  designate by
written notice to the Holders of the Debentures;
                  (6) the Debentures shall be issued in registered form only and
in  denominations of $1,000 or any amount in excess thereof which is an integral
multiple of $1,000;


                                       7


                  (7) principal and interest on the Debentures  shall be payable
in the coin or currency of the United States of America,  which,  at the time of
payment, is legal tender for public and private debts; and
                  (8) the  Debentures  shall be  subject to  defeasance,  at the
Company's  option,  as provided for in Sections 1302 and 1303 of the  Indenture.
Upon the  Company's  exercise  of the  option to effect  such  defeasance  under
Section  1302 and 1303 of the  Indenture in  accordance  with and subject to the
terms thereof,  the Company shall be released from its obligations  with respect
to the  Debentures  as provided  in the  applicable  Section and other  relevant
provisions of the Indenture.
         Section 4.  No Redemption.  The Debentures will not be redeemable prior
                     --------------
to maturity and will not be subject to any sinking fund.
         Section 5.  Amendment to Indenture for Purposes of Eighth Series of 
                     -------------------------------------------------------
                     Debentures.
                     -----------
         For all  purposes  of the  Debentures  and for no other  purposes,
subsection (4) of Section 501 shall read:  
                  "(4) default in the performance, or breach, of any covenant or
                  warranty  of the  Company  in  this  Indenture  (other  than a
                  covenant or warranty a default in whose  performance  or 


                                       8


                  whose breach is elsewhere in this Section  specifically  dealt
                  with or which has expressly  been  included in this  Indenture
                  solely for the  benefit of a series of  Securities  other than
                  that series),  and continuance of such default or breach for a
                  period of 90 days after there has been given, by registered or
                  certified  mail,  to  the  Company  by the  Trustee  or to the
                  Company  and the  Trustee  by the  Holders  of a  majority  in
                  principal amount of the Outstanding  Securities of that series
                  a  written  notice  specifying  such  default  or  breach  and
                  requiring  it to be remedied and stating that such notice is a
                  "Notice of Default" hereunder; or" 
          For all purposes of the Debentures and for no other  purposes,  the 
     first  paragraph of Section 502 shall read:
                  "If an Event of  Default  with  respect to  Securities  of any
                  series at the time Outstanding occurs and is continuing,  then
                  and in  every  such  case  the  Trustee  or the  Holders  of a
                  majority in principal amount of


                                       9


                  the  Outstanding  Securities  of that  series may  declare the
                  principal  amount (or, if any of the Securities of that series
                  are Original  Issue Discount  Securities,  such portion of the
                  principal amount of such Securities as may be specified in the
                  terms  thereof) of all of the  Securities of that series to be
                  due and  payable  immediately,  by a notice in  writing to the
                  Company (and to the Trustee if given by Holders), and upon any
                  such declaration  such principal amount (or specified  amount)
                  shall become immediately due and payable."
           For all  purposes  of the  Debentures  and for no other  purposes,
     subsection (2) of Section 507 shall read:  
                  "(2) the  Holders of a  majority  in  principal  amount of the
                  Outstanding  Securities of that series shall have made written
                  request to the Trustee to institute  proceedings in respect of
                  such Event of Default in its own name as Trustee hereunder;"
           For all  purposes  of the  Debentures  and for no other  purposes,
                  subsection  (5) of Section 507 shall read: 


                                       10


                  "(5) no direction  inconsistent  with such written request has
                  been given to the Trustee  during  such  90-day  period by the
                  Holders  of  66-2/3% in  principal  amount of the  Outstanding
                  Securities of that series."
         Section 6. Incorporation of Indenture.  From and after the date hereof,
                    ---------------------------
the Indenture, as supplemented by this Eighth Supplemental  Indenture,  shall be
read,  taken and  construed as one and the same  instrument  with respect to the
Debentures.
         Section 7. Acceptance of Trust.  The Trustee accepts the trusts created
                    --------------------
by  the  Indenture,   as  heretofore  supplemented  by  the  First  Supplemental
Indenture,  Second Supplemental Indenture, Third Supplemental Indenture,  Fourth
Supplemental  Indenture,   Fifth  Supplemental  Indenture,   Sixth  Supplemental
Indenture and Seventh Supplemental  Indenture and as hereby supplemented by this
Eighth Supplemental Indenture, and agrees to perform the same upon the terms and
conditions in the Indenture, as so supplemented.
         Section 8. Conflict with Trust  Indenture Act. If any provision  hereof
                    -----------------------------------
limits,  qualifies or conflicts with a provision of the Trust Indenture Act that
is required  under such Act to be a part of and govern this Eighth  Supplemental
Indenture,  such  provision of the Act shall  control.  If any provision of this


                                       11


Eighth  Supplemental  Indenture  modifies or excludes any provision of the Trust
Indenture  Act that may be so modified or  excluded,  such  provision of the Act
shall be  deemed  to  apply to this  Eighth  Supplemental  Indenture  only as so
modified and if not so excluded, as the case may be.
         Section 9.  Governing Law.  This Eighth Supplemental Indenture, and the
                     --------------
Debentures,  shall be governed by and construed in  accordance  with the laws of
the State of New York.
         Section 10.  Recitals.  The recitals  contained in the Indenture,  this
                      ---------
Eighth  Supplemental   Indenture  and  the  Debentures,   except  the  Trustee's
certificate of authentication,  shall be taken as statements of the Company, and
the Trustee assumes no responsibility for their  correctness.  The Trustee makes
no  representations  as to the  validity or  sufficiency  of the  Indenture,  as
supplemented by this Eighth Supplemental Indenture.
         Section 11.  Amendments.  Notwithstanding  any other provisions hereof,
                      -----------
all  amendments to the Indenture made hereby shall have effect only with respect
to the  Debentures,  and not with respect to the  Securities of any other series
created subsequent to the date hereof.
         Section 12.  Counterparts.  This Eighth  Supplemental  Indenture may be
                      -------------
executed in any number of counterparts,  each of which when so executed shall be
deemed to be an original,  but all


                                       12


such counterparts shall together constitute but one and the same instrument.


                                       13





         IN  WITNESS  WHEREOF,  the  parties  hereto  have  caused  this  Eighth
Supplemental Indenture to be duly executed, and their respective corporate seals
to be hereunto affixed and attested, all as of the date first above written.

                                         CITIZENS UTILITIES COMPANY


                                         By: /s/ Robert J. DeSantis
                                             -----------------------
                                             Title: Vice President and 
                                                    Treasurer

Attest:

/s/Edward O. Kipperman
- - ----------------------
Edward O. Kipperman
Vice President, Tax

                                         THE CHASE MANHATTAN BANK,
                                               as Trustee



                                         By: /s/ Thomas J. Foley
                                             --------------------
                                             Title:  Vice President
Attest:


/s/R. Lorenze
- - -------------



                                       14








County of Fairfield  )
                     )  ss.:
State of Connecticut )




               On the 5th day of  December,  1996,  before  me  personally  came
Robert  DeSantis,  to me known,  who, being by me duly sworn, did depose and say
that he is Vice President and Treasurer of CITIZENS  UTILITIES  COMPANY,  one of
the corporations described in and which executed the foregoing instrument;  that
he knows the seal of said corporation;  that the seal affixed to said instrument
is such  corporate  seal;  that it was so affixed by  authority  of the Board of
Directors  of said  corporation,  and that he signed  his name  thereto  by like
authority.




                          ----------------------------------
                             Notary Public, State of Connecticut





                                       15








County of New York   )
                     )             ss.:
State of New York    )



               On this  5th day of  December,  in the  year  of 1996  before  me
personally came Thomas Foley, to me personally known, who being by me duly sworn
did  depose  and say that he  resides  at  Bethpage,  New York,  that he is Vice
President of The Chase Manhattan Bank, one of the corporations  described in and
which  executed  the  foregoing  indenture;  that  he  knows  the  seal  of said
corporation;  that the seal affixed to said  instrument  opposite the  execution
thereof on behalf of said corporation is the corporate seal of said corporation;
that said instrument was signed and said corporate seal was so affixed on behalf
of said  corporation  by authority and order of its board of directors;  that he
signed his name thereto by like authority;  and he acknowledged  said instrument
to be his free act and deed and the free act and deed of said Bank.

               IN WITNESS  WHEREOF I have  hereunder  set my hand and affixed my
official  seal,  at New York in said  State of New York,  the day and year first
above written.






                        ----------------------------------
                           Notary Public, State of New York




                                       16


                                                                EXECUTION COPY




===============================================================================





                           CITIZENS UTILITIES COMPANY

                                       TO

                            THE CHASE MANHATTAN BANK
                                    (Trustee)


- - --------------------------------------------------------------------------------

                          EIGHTH SUPPLEMENTAL INDENTURE

                          Dated as of December 1, 1996


- - --------------------------------------------------------------------------------



                          Supplemental to the Indenture

                           Dated as of August 15, 1991


================================================================================