Exhibit 24
LIMITED POWER OF ATTORNEY
FOR SEC REPORTING OBLIGATIONS
The undersigned hereby constitutes, and appoints each of Linda G.
Sullivan, Michael A. Sgro and Jeffrey M. Taylor, or any of them acting
singly, with full power of substitution, as the undersigned's true and
lawful attorney-in-fact to:
1. Prepare, execute in the undersigned's name and on the undersigned's
behalf, and submit to the U.S. Securities and Exchange Commission (the
"SEC") a Form ID including amendments thereto, and any other documents
necessary or appropriate to obtain codes, passwords, and passphrases
enabling the undersigned to make electronic filings with the SEC of
reports required by Section 16(a) of the Securities Exchange Act of 1934,
as amended, and the rules and regulations promulgated thereunder, each
as amended from time to time ("Section 16(a) and Related Rules");
2. Prepare, execute for and on behalf of the undersigned, in the
undersigned's capacity as an officer and/or director of American Water
Works Company, Inc. (the "Company"), Forms 3, 4, and 5 in accordance
with Section 16(a) and Related Rules, and Form 144 in accordance with
Rule 144 of the Securities Act of 1933, as amended, and the rules and
regulations thereunder (the "1933 Act"), including any amendments
thereto, relating to the securities of the Company, and file the same
with the SEC and any securities exchange in accordance with Section 16(a)
and Related Rules and the 1933 Act, respectively;
3. Seek or obtain, on behalf of the undersigned, information on
transactions in the Company's securities from any third party, including
brokers, employee benefit plan administrators and trustees; the
undersigned hereby authorizes any such person to release any such
information to the attorney-in-fact and approves and ratifies any such
release of information; and
4. Perform any and all other acts for and on behalf of the undersigned
that, in the discretion of such attorney-in-fact, are necessary or
desirable in connection with the foregoing.
The undersigned hereby grants each such attorney-in-fact full power
and authority to do and perform any and every act and thing whatsoever
requisite, necessary or appropriate to be done in the exercise of any of
the rights and powers herein granted, as fully to all intents and
purposes as the undersigned might or could do if present, with full power
of substitution, hereby ratifying and confirming all that such attorney-
in-fact, or such attorney-fact's substitute or substitutes, shall
lawfully do or cause to be done by virtue of this Limited Power of
Attorney. The undersigned acknowledges and the foregoing attorneys-in-
fact, in serving in such capacity at the request of the undersigned, are
not assuming, nor is the Company assuming, any of the undersigned's
responsibilities to comply with Section 16 of the Securities Exchange Act
of 1934 or the 1933 Act.
The Limited Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file Forms 144, 3, 4, and
5 with respect to the undersigned's holdings of and transactions in the
Company's securities, unless earlier revoked by the undersigned in a
signed writing delivered to each such attorney-in-fact. In addition,
this Limited Power of Attorney shall automatically be revoked as to any
attorney-in-fact constituted or appointed hereunder upon termination of
such person's employment with the Company. This Limited Power of
Attorney shall constitute an automatic revocation of any prior Limited
Power of Attorney executed by the undersigned with respect to the subject
matter hereof.
IN WITNESS WHEREOF, the undersigned has caused this Limited Power of
Attorney to be executed as of this 30th day of May, 2016.
BY: /s/ Jennifer Gambol
(Signature)
Jennifer Gambol
_____________________________
(Printed Name)
