Exhibit 24
LIMITED POWER OF ATTORNEY FOR SEC REPORTING OBLIGATIONS

Effective as of February 15, 2023 (the "Effective Date"), the
undersigned hereby constitutes, and appoints each of James H.
Gallegos, Jeffrey M. Taylor and Justin B. Ettelson, or any of
them acting singly, with full power of substitution, as the
undersigned's true and lawful attorney-in-fact to, beginning on
and as of the Effective Date:

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 promulgated under 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-in-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(a) and Related Rules 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 or an affiliate, or if such
person decides not to commence employment with the Company or an
affiliate. 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 14th day of February
2023, to be effective as of the Effective Date.

/s/ MARTHA CLARK GOSS
(Signature)


Martha Clark Goss
(Printed Name)