Exhibit 3.1

SECOND AMENDED AND RESTATED

CERTIFICATE OF INCORPORATION

OF

GLOBAL WATER RESOURCES, INC.

Pursuant to Sections 242 and 245 of

the General Corporation Law of the State of Delaware

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GLOBAL WATER RESOURCES, INC., a Delaware corporation (the “Corporation”), does hereby certify that:

FIRST: The name of this Corporation is Global Water Resources, Inc.

SECOND: The Corporation was originally incorporated pursuant to the General Corporation Law of the State of Delaware (the “DGCL”) on May 2, 2008.

THIRD: The Corporation’s Amended and Restated Certificate of Incorporation was filed with the Secretary of State of the State of Delaware on October 21, 2010.

FOURTH: This Second Amended and Restated Certificate of Incorporation (the “Certificate”) amends, restates and integrates the provisions of the Amended and Restated Certificate of Incorporation, as amended, and has been duly adopted in accordance with the provisions of Sections 242 and 245 of the DGCL.

FIFTH: This Certificate shall become effective on Thursday, April 28, 2016 at 9:15 a.m. Eastern Time.

SIXTH: Upon the filing with the Secretary of State of the State of Delaware of this Certificate, the Certificate of Incorporation shall be amended and restated in its entirety to be and read as set forth on Exhibit A attached hereto.

[Signature Page Follows]

IN WITNESS WHEREOF, this Second Amended and Restated Certificate of Incorporation has been executed by a duly authorized officer of the Corporation on this 26th day of April, 2016.

EXHIBIT A

ARTICLE ONE

Name

The name of the Corporation is Global Water Resources, Inc. (hereinafter the “Corporation”).

ARTICLE TWO

Registered Office and Agent

The address of the registered office of the Corporation in the State of Delaware is 2711 Centerville Road, Suite 400, Wilmington, County of New Castle, Delaware 19808. The name of its registered agent at such address is Corporation Service Company.

ARTICLE THREE

Purpose

The purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of the State of Delaware (the “DGCL”).

ARTICLE FOUR

Authorized Stock

1. Total Authorized. The total number of shares of all classes of capital stock that the Corporation has authority to issue is 65,000,000 shares, consisting of 60,000,000 shares of common stock, par value $0.01 per share (“Common Stock”), and 5,000,000 shares of preferred stock, par value $0.01 per share (“Preferred Stock”). The number of authorized shares of Common Stock or Preferred Stock may be increased or decreased (but not below the number of shares thereof then outstanding) by the affirmative vote of the holders of capital stock representing a majority of the voting power of all the then-outstanding shares of capital stock of the Corporation entitled to vote thereon, without a separate vote of the holders of the Preferred Stock or any series thereof (unless a vote of any such holders is required pursuant to the terms of any Certificate of Designation designating a series of Preferred Stock), irrespective of the provisions of Section 242(b)(2) of the DGCL.

2. Blank-Check Preferred Stock. The Board of Directors is hereby expressly authorized to provide, out of the unissued shares of Preferred Stock, for one or more series of Preferred Stock and, with respect to each such series, to fix the number of shares constituting such series and the designation of such series, the voting powers, if any, of the shares of such series, and the preferences and relative, participating, optional or other special rights, if any, and any qualifications, limitations or restrictions thereof, of the shares of such series. The powers, preferences and relative, participating, optional and other special rights of each series of Preferred Stock, and the qualifications, limitations or restrictions thereof, if any, may differ from those of any and all other series at any time outstanding.

ARTICLE FIVE

Election of Directors

Unless and except to the extent that the bylaws of the Corporation (the “Bylaws”) shall so require, the election of directors of the Corporation need not be by written ballot.

ARTICLE SIX

Limitation of Liability

To the fullest extent permitted by law, a director of the Corporation shall not be personally liable to the Corporation or to its stockholders for monetary damages for any breach of fiduciary duty as a director. Without limiting the effect of the preceding sentence, if the DGCL is hereafter amended to authorize the further elimination or limitation of the liability of a director, then the liability of a director of the Corporation shall be eliminated or limited to the fullest extent permitted by the DGCL, as so amended. No amendment to, modification of or repeal of this Article Six shall apply to or have any effect on the liability or alleged liability of any director of the Corporation for or with respect to any acts or omissions of such director occurring prior to such amendment.

ARTICLE SEVEN

Indemnification

The Corporation shall indemnify, advance expenses, and hold harmless, to the fullest extent permitted by applicable law as it presently exists or may hereafter be amended, any person (a “Covered Person”) who was or is made or is threatened to be made a party or is otherwise involved in any action, suit or proceeding, whether civil, criminal, administrative or investigative (a “Proceeding”), by reason of the fact that he or she, or a person for whom he or she is the legal representative, is or was a director or officer of the Corporation or, while a director or officer of the Corporation, is or was serving at the request of the Corporation as a director, officer, employee or agent of another corporation or of a partnership, joint venture, trust, enterprise or nonprofit entity, including service with respect to employee benefit plans, against all liability and loss suffered and expenses (including attorneys’ fees) reasonably incurred by such Covered Person. Notwithstanding the preceding sentence, except for claims for indemnification (following the final disposition of such Proceeding) or advancement of expenses not paid in full, the Corporation shall be required to indemnify a Covered Person in connection with a Proceeding (or part thereof) commenced by such Covered Person only if the commencement of such Proceeding (or part thereof) by the Covered Person was authorized in the specific case by the Board of Directors of the Corporation. Any amendment, repeal or modification of this Article Seven shall not adversely affect any right or protection hereunder of any person in respect of any act or omission occurring prior to the time of such repeal or modification.

ARTICLE EIGHT

Amendment of Bylaws

In furtherance and not in limitation of the powers conferred by statute, the Board of Directors is expressly authorized to adopt, amend or repeal the Bylaws or adopt new Bylaws without any action on the part of the stockholders; provided that any Bylaw adopted or amended

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by the Board of Directors, and any powers thereby conferred, may be amended, altered or repealed by the affirmative vote of stockholders holding at least two-thirds of the voting power of all of the then-outstanding shares of capital stock of the Corporation entitled to vote generally in the election of directors, voting together as a single class (in addition to any other vote of the holders of any class or series of stock of the Corporation required by applicable law or by this Certificate of Incorporation, including but not limited to the terms of any Preferred Stock issued pursuant to a Certificate of Designation).

ARTICLE NINE

Matters Relating to Stockholders

1. Special Meetings of Stockholders. Subject to the rights of the holders of any series of Preferred Stock with respect to actions by the holders of shares of such series, special meetings of the stockholders of the Corporation may be called only by the Board of Directors, the Chairperson of the Board, the Chief Executive Officer, or the President (in the absence of a Chief Executive Officer), and may not be called by any other person or persons. Business transacted at special meetings of stockholders shall be confined to the purpose or purposes stated in the notice of meeting.

2. Advance Notice of Stockholder Nominations. Advance notice of stockholder nominations for the election of directors of the Corporation and of business to be brought by stockholders before any meeting of stockholders of the Corporation shall be given in the manner provided in the Bylaws.

ARTICLE TEN

Forum Selection

Unless the Corporation consents in writing to the selection of an alternative forum, the Court of Chancery of the State of Delaware shall, to the fullest extent permitted by law, be the sole and exclusive forum for (1) any derivative action or proceeding brought on behalf of the Corporation, (2) any action asserting a claim for breach of a fiduciary duty owed by any director, officer, employee or agent of the Corporation to the Corporation or the Corporation’s stockholders, (3) any action asserting a claim arising pursuant to any provision of the DGCL, the Certificate of Incorporation or the Bylaws, (4) any action to interpret, apply, enforce or determine the validity of the Corporation’s Certificate of Incorporation or Bylaws, or (5) any action asserting a claim governed by the internal affairs doctrine, in each case subject to said Court of Chancery having personal jurisdiction over the indispensable parties named as defendants therein. Any person or entity purchasing or otherwise acquiring any interest in shares of capital stock of the Corporation shall be deemed to have notice of and consented to the provisions of this Article Ten.

ARTICLE ELEVEN

Amendment of Certificate of Incorporation

The Corporation shall have the right, subject to any express provisions or restrictions contained in the Certificate of Incorporation of the Corporation (the “Certificate of Incorporation”) or the Bylaws, from time to time, to amend, alter or repeal any provision of the

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Certificate of Incorporation in any manner now or hereafter provided by law, and all rights and powers of any kind conferred upon a director or stockholder of the Corporation by the Certificate of Incorporation or any amendment thereof are conferred subject to such right; provided, however, that, notwithstanding any other provision of this Certificate of Incorporation or any provision of applicable law that might otherwise permit a lesser vote or no vote, but in addition to any vote of the holders of any class or series of the capital stock of this Corporation required by applicable law or by this Certificate of Incorporation (including but not limited to the terms of any Preferred Stock issued pursuant to a Certificate of Designation), any amendment to or repeal of this Article Eleven or Articles Six, Seven, Eight, Nine or Ten of this Certificate of Incorporation (or the adoption of any provision inconsistent therewith) shall require the affirmative vote of the holders of at least two-thirds of the voting power of the then outstanding shares of capital stock of the Corporation entitled to vote generally in the election of directors, voting together as a single class.

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