POWER
OF ATTORNEY
As an officer and/or director of Energy
Recovery, Inc. (the "Company"), the undersigned is subject to the reporting
requirements of Section 16 of the Securities Exchange Act of 1934, as
amended.
By signing this document, the
undersigned designates and appoints each of Deno Bokas, Carolyn F. Bostick, G.G.
Pique and Thomas D.Willardson as the undersigned’s true and lawful
attorney-in-fact to:
(1) prepare and execute Forms ID, 3, 4
and 5 including amendments to these Forms, for and on behalf the undersigned, in
the undersigned’s capacity as an officer and/or director of the
Company;
(2) prepare and execute any other forms
or amendments to such forms as she or he determines, in his or her discretion,
that are required or advisable to be filed under Section 16, as amended, and
related rules and regulations, including any successor laws and regulations, as
a consequence of the undersigned’s status as a director or as a result of the
undersigned’s ownership, acquisition or disposition of securities of the
Company; and
(3) undertake all acts necessary in
order to file and submit such forms to the U.S. Securities and Exchange
Commission, any securities exchange or national association, the Company and
such other person or agency as the attorney-in-fact deems
appropriate.
The undersigned hereby ratifies and
confirms all acts that each of the attorneys-in-fact and agents do or cause to
be done by virtue of this Power of Attorney. The undersigned
acknowledges that the each of the attorneys-in-fact, in serving in such capacity
at the undersigned’s request, are not assuming, nor is the Company assuming, any
of the undersigned’s responsibilities to comply with Section 16, as
amended.
This Power of Attorney shall remain in
full force and effect until the undersigned is no longer required to file Forms
ID, 3, 4 and 5 or to report holdings of, and transactions in, securities issued
by the Company, or until the undersigned revokes this Power of Attorney by
delivering to the Company a signed revocation in writing to the Company and to
each of the attorneys-in-fact.
IN WITNESS WHEREOF, I have caused this
Power of Attorney to be executed as of this 22nd day of February,
2009.
/s/ Arve
Hanstveit
Arve
Hanstveit