Exhibit 3.7

AMENDED AND RESTATED

CERTIFICATE OF INCORPORATION

OF

MONTROSE ENVIRONMENTAL GROUP, INC.

(a Delaware corporation)

(Pursuant to Sections 242 and 245 of the General Corporation Law of the State of Delaware (the “DGCL”))

MONTROSE ENVIRONMENTAL GROUP, INC., a corporation organized and existing under the provisions of the DGCL,

DOES HEREBY CERTIFY:

FIRST: That the name of the corporation is Montrose Environmental Group, Inc. (the “Corporation”), and that the Corporation was originally incorporated pursuant to the DGCL on November 25, 2013.

SECOND: The Corporation’s Certificate of Incorporation (as amended, the “Original Certificate of Incorporation”) was filed with the Secretary of State of the State of Delaware on November 25, 2013, and subsequently amended by that certain Certificate of Amendment of Certificate of Incorporation dated December 6, 2017, and that certain Certificate of Amendment of Certificate of Incorporation dated April 13, 2020.

THIRD: This Amended and Restated Certificate of Incorporation has been duly adopted pursuant to Sections 242 and 245 of the Delaware General Corporation Law.

FOURTH: The Original Certificate of Incorporation is hereby amended and restated in its entirety as follows:

ARTICLE I

NAME

The name of the corporation is Montrose Environmental Group, Inc. (the “Corporation”).

ARTICLE II

AGENT

The address of the Corporation’s registered office in the State of Delaware is 1209 Orange Street, Wilmington, New Castle County, Delaware 19801. The name of its registered agent at such address is The Corporation Trust Company.

ARTICLE III

PURPOSE

The purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under the DGCL.

ARTICLE IV

STOCK

Section 4.1    Authorized Stock. The total number of shares which the Corporation shall have authority to issue is Two Hundred Million Twenty-Nine Thousand Five Hundred (200,029,500), of which One Hundred Ninety Million (190,000,000) shall be designated as Common Stock, par value $0.000004 per share (the “Common Stock”), and Ten Million Twenty-Nine Thousand Five Hundred (10,029,500) shall be designated as Preferred Stock, par value $0.0001 per share (the “Preferred Stock”).

Section 4.2    Common Stock.

(a)    Each holder of Common Stock, as such, shall be entitled to one vote for each share of Common Stock held of record by such holder on all matters on which stockholders generally are entitled to vote; provided, however, that, except as otherwise required by law, holders of Common Stock, as such, shall not be entitled to vote on any amendment to this Certificate of Incorporation, including any certificate of designations relating to any series of Preferred Stock (each hereinafter referred to as a “Preferred Stock Designation”), that relates solely to the terms of one or more outstanding series of Preferred Stock if the holders of such affected series are entitled, either separately or together with the holders of one or more other such series, to vote thereon pursuant to this Certificate of Incorporation (including any Preferred Stock Designation).

(b)    Dividends. Subject to the rights of the holders of any outstanding series of Preferred Stock, the holders of shares of Common Stock shall be entitled to receive dividends to the extent permitted by law when, as and if declared by the Board of Directors.

(c)    Liquidation. Upon the dissolution, liquidation or winding up of the Corporation, subject to the rights of the holders of any outstanding series of Preferred Stock, the holders of shares of Common Stock shall be entitled to receive the assets of the Corporation available for distribution to its stockholders ratably in proportion to the number of shares held by them.

Section 4.3    Preferred Stock. The Preferred Stock may be issued from time to time in one or more series. Subject to limitations prescribed by law and the provisions of this Article IV (including any Preferred Stock Designations), the Board of Directors is hereby authorized to provide by resolution and by causing the filing of a Preferred Stock Designation for the issuance of the shares of Preferred Stock in one or more series, and to establish from time to time the number of shares to be included in each such series, and to fix the designations, powers, preferences, and relative, participating, optional or other rights, if any, and the qualifications, limitations or restrictions, if any, of the shares of each such series.

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Section 4.4    No Class Vote on Changes in Authorized Number of Shares of Stock. Subject to the rights of the holders of any outstanding series of 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 at least a majority of the voting power of the stock outstanding and entitled to vote thereon irrespective of the provisions of Section 242(b)(2) of the DGCL.

ARTICLE V

BOARD OF DIRECTORS

Section 5.1    Number. Except as otherwise provided for or fixed pursuant to the provisions of Article IV hereof (including any Preferred Stock Designation), the Board of Directors shall consist of not fewer than three (3) nor more than fifteen (15) directors, the exact number to be determined from time to time solely by resolution adopted by the affirmative vote of a majority of the total number of directors then authorized.

Section 5.2    Classification.

(a)    Except as may be otherwise provided with respect to directors elected by the holders of any series of Preferred Stock provided for or fixed pursuant to the provisions of Article IV hereof (including any Preferred Stock Designation) (the “Preferred Stock Directors”), the Board of Directors shall be divided into three classes, as nearly equal in number as possible, designated Class I, Class II and Class III. Class I directors shall initially serve until the first annual meeting of stockholders following the initial effectiveness of this Section 5.2; Class II directors shall initially serve until the second annual meeting of stockholders following the initial effectiveness of this Section 5.2; and Class III directors shall initially serve until the third annual meeting of stockholders following the initial effectiveness of this Section 5.2. Commencing with the first annual meeting of stockholders following the initial effectiveness of this Section 5.2, directors of each class the term of which shall then expire shall be elected to hold office for a three-year term and until the election and qualification of their respective successors in office. In case of any increase or decrease, from time to time, in the number of directors (other than Preferred Stock Directors), the number of directors in each class shall be apportioned as nearly equal as possible. The Board of Directors is authorized to assign members of the Board of Directors already in office to Class I, Class II or Class III, with such assignment becoming effective as of the initial effectiveness of this Section 5.2.

(b)    Subject to the rights of the holders of any outstanding series of Preferred Stock, and unless otherwise required by law, newly created directorships resulting from any increase in the authorized number of directors and any vacancies in the Board of Directors resulting from death, resignation, retirement, disqualification, removal from office or other cause shall be filled solely by the affirmative vote of a majority of the remaining directors then in office, even though less than a quorum of the Board of Directors, or by the sole remaining director. Any director so chosen shall hold office until the next election of the class for which such director shall have been chosen and until his or her successor shall have been duly elected and qualified. No decrease in the authorized number of directors shall shorten the term of any incumbent director.

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(c)    Any director, or the entire Board of Directors, may be removed from office at any time, but only for cause and only by the affirmative vote of at least 66²⁄₃% of the voting power of the stock outstanding and entitled to vote thereon.

Section 5.3    During any period when the holders of any series of Preferred Stock have the right to elect additional directors as provided for or fixed pursuant to the provisions of Article IV hereof (including any Preferred Stock Designation), and upon commencement and for the duration of the period during which such right continues: (i) the then otherwise total authorized number of directors of the Corporation shall automatically be increased by such number of directors that the holders of any series of Preferred Stock have a right to elect, and the holders of such Preferred Stock shall be entitled to elect the additional directors so provided for or fixed pursuant to said provisions; and (ii) each Preferred Stock Director shall serve until such Preferred Stock Director’s successor shall have been duly elected and qualified, or until such director’s right to hold such office terminates pursuant to said provisions, whichever occurs earlier, subject to his or her earlier death, disqualification, resignation or removal. Except as otherwise provided for or fixed pursuant to the provisions of Article IV hereof (including any Preferred Stock Designation), whenever the holders of any series of Preferred Stock having such right to elect additional directors are divested of such right pursuant to said provisions, the terms of office of all Preferred Stock Directors elected by the holders of such Preferred Stock, or elected to fill any vacancies resulting from the death, resignation, disqualification or removal of such additional directors, shall forthwith terminate (in which case each such Preferred Stock Director shall cease to be qualified as a director and shall cease to be a director) and the total authorized number of directors of the Corporation shall be automatically reduced accordingly.

Section 5.4    Powers. Except as otherwise required by the DGCL or as provided in this Certificate of Incorporation (including any Preferred Stock Designation), the business and affairs of the Corporation shall be managed by or under the direction of the Board of Directors.

Section 5.5    Election; Annual Meeting of Stockholders.

(a)    Ballot Not Required. The directors of the Corporation need not be elected by written ballot unless the Bylaws of the Corporation so provide.

(b)    Notice. Advance notice of nominations for the election of directors, and of business other than nominations, to be proposed by stockholders for consideration at a meeting of stockholders of the Corporation shall be given in the manner and to the extent provided in or contemplated by the Bylaws of the Corporation.

(c)    Annual Meeting. The annual meeting of stockholders, for the election of directors to succeed those whose terms expire and for the transaction of such other business as may properly come before the meeting, shall be held at such place, if any, either within or without the State of Delaware, on such date, and at such time as the Board of Directors shall fix.

ARTICLE VI

STOCKHOLDER ACTION

Except with respect to actions required or permitted to be taken solely by holders of Preferred Stock pursuant to the provisions of Article IV hereof (including any Preferred Stock Designation), no action that is required or permitted to be taken by the stockholders of the Corporation may be effected by consent of stockholders in lieu of a meeting of stockholders.

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ARTICLE VII

SPECIAL MEETINGS OF STOCKHOLDERS

Except as otherwise required by law, and except as otherwise provided for or fixed pursuant to the provisions of Article IV hereof (including any Preferred Stock Designation), a special meeting of the stockholders of the Corporation: (a) may be called at any time by the Board of Directors, the Chairman of the Board of Directors or the Chief Executive Officer with the concurrence of a majority of the Board of Directors; and (b) shall be called by the Chairman of the Board of Directors or the Secretary of the Corporation upon the written request or requests of one or more persons that: (i) own (as defined in the Bylaws of the Corporation, as amended from time to time) shares representing at least 45% of the voting power of the stock outstanding and entitled to vote on the matter or matters to be brought before the proposed special meeting as of the record date fixed in accordance with the Bylaws of the Corporation (as amended from time to time) to determine who may deliver a written request to call the special meeting; and (ii) comply with such procedures for calling a special meeting of stockholders as may be set forth in the Bylaws of the Corporation and amended from time to time. The foregoing provisions of this Article VII shall be subject to the provisions of the Bylaws of the Corporation (as amended from time to time) that limit the ability to make a request for a special meeting and that specify the circumstances pursuant to which a request for a special meeting will be deemed to be revoked. Except as otherwise required by law, and except as otherwise provided for or fixed pursuant to the provisions of Article IV hereof (including any Preferred Stock Designation), special meetings of the stockholders of the Corporation may not be called by any other person or persons. Only such business shall be conducted at a special meeting of stockholders as shall have been brought before the meeting pursuant to the Corporation’s notice of meeting.

ARTICLE VIII

CORPORATE OPPORTUNITIES

Section 8.1    In recognition and anticipation that (a) certain directors, principals, members, officers, employees and/or other representatives of one or more of the Investors and their respective Affiliates (each as defined below) may serve as directors of the Corporation, (b) one or more of the Investors and their respective Affiliates may now engage and may continue to engage in the same or similar activities or related lines of business as those in which the Corporation, directly or indirectly, may engage and/or other business activities that overlap with or compete with those in which the Corporation, directly or indirectly, may engage, and (c) members of the Board of Directors who are affiliated with Investors (“Investor Directors”) and their respective Affiliates may now engage and may continue to engage in the same or similar activities or related lines of business as those in which the Corporation, directly or indirectly, may engage and/or other business activities that overlap with or compete with those in which the Corporation, directly or indirectly, may engage, the provisions of this Article VIII are set forth to regulate and define the conduct of certain affairs of the Corporation with respect to certain classes or categories of business opportunities as they may involve any of the Investors, the Investor Directors or their respective Affiliates and the powers, rights, duties and liabilities of the Corporation and its directors, officers and stockholders in connection therewith.

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Section 8.2    None of (a) the Investors or any of their respective Affiliates or (b) the Investor Directors or his or her Affiliates (the Persons (as defined below) identified in (a) and (b) above being referred to, collectively, as “Identified Persons” and, individually, as an “Identified Person”) shall, to the fullest extent permitted by law, have any duty to refrain from directly or indirectly (1) engaging in a corporate opportunity in the same or similar business activities or lines of business in which the Corporation or any of its controlled Affiliates now engages or proposes to engage or (2) otherwise competing with the Corporation or any of its controlled Affiliates, and, to the fullest extent permitted by law, no Identified Person shall be liable to the Corporation or its stockholders or to any Affiliate of the Corporation for breach of any fiduciary duty solely by reason of the fact that such Identified Person engages in any such activities. To the fullest extent permitted by law, the Corporation hereby renounces any interest or expectancy in, or right to be offered an opportunity to participate in, any business opportunity which may be a corporate opportunity for an Identified Person and the Corporation or any of its controlled Affiliates, except as provided in Section 8.4. Subject to Section 8.4, in the event that any Identified Person acquires knowledge of a potential transaction or other matter or business opportunity which may be a corporate opportunity for itself, herself or himself and the Corporation or any of its Affiliates, such Identified Person shall, to the fullest extent permitted by law, have no fiduciary duty to communicate, present or offer such transaction or other business opportunity to the Corporation or any of its controlled Affiliates and, to the fullest extent permitted by law, shall not be liable to the Corporation or its stockholders or to any controlled Affiliate of the Corporation for breach of any fiduciary duty as a stockholder or director of the Corporation solely by reason of the fact that such Identified Person pursues or acquires such corporate opportunity for itself, herself or himself, offers or directs such corporate opportunity to another Person, or does not present such corporate opportunity to the Corporation or any of its Affiliates.

Section 8.3    The Corporation and its Affiliates do not have any rights in and to the business ventures of any Identified Person, or the income or profits derived therefrom.

Section 8.4    The Corporation does not renounce its interest in any corporate opportunity offered to any Investor Director if such opportunity is expressly offered to such person in writing solely in his or her capacity as a director of the Corporation, and the provisions of Section 8.2 shall not apply to any such corporate opportunity.

Section 8.5    In addition to and notwithstanding the foregoing provisions of this Article XI, a corporate opportunity shall not be deemed to be a potential corporate opportunity for the Corporation if it is a business opportunity that (a) the Corporation is neither financially nor legally able, nor contractually permitted to undertake, (b) from its nature, is not in the line of the Corporation’s business or is of no practical advantage to the Corporation or (c) is one in which the Corporation has no interest or reasonable expectancy.

Section 8.6    To the fullest extent permitted by law, any Person purchasing or otherwise acquiring any interest in any shares of capital stock of the Corporation shall be deemed to have notice of and to have consented to the provisions of this Article VIII. Neither the alteration, amendment, addition to or repeal of this Article VIII, nor the adoption of any provision of this Certificate of Incorporation, as amended (including any Preferred Stock Designation), inconsistent with this Article VIII, shall eliminate or reduce the effect of this Article VIII in

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respect of any business opportunity first identified, or any cause of action, suit or claim that, but for this Article VIII, would accrue or arise, prior to such alteration, amendment, addition, repeal or adoption.

Section 8.7    For purposes of this Article VIII:

(a)    “Affiliate” shall mean (i) in respect of any Investor, any Person that, directly or indirectly, is controlled by such Investor, controls such Investor or is under common control with such Investor and shall include any principal, member, director, partner, stockholder, officer, employee or other representative of any of the foregoing (other than the Corporation and any entity that is controlled by the Corporation), (ii) in respect of an Investor Director, any Person that, directly or indirectly, is controlled by such Investor Director (other than the Corporation and any entity that is controlled by the Corporation) and (iii) in respect of the Corporation, any Person that, directly or indirectly, is controlled by the Corporation;

(b)    “control” (including the terms “controlled by” and “under common control with”), with respect to the relationship between or among two or more Persons, means the possession, directly or indirectly, of the power to direct or cause the direction of the affairs or management of a Person, whether through the ownership of voting securities, by contract or otherwise.

(c)    “Investor” means the Sponsor and any Transferee which holds shares of Series A-1 and Series A-2 Preferred Stock.

(d)    “Person” means any individual, corporation, limited liability company, limited or general partnership, joint venture, association, joint-stock company, trust, unincorporated organization or other entity, whether domestic or foreign.

(e)    “Sponsor” means Oaktree Capital Management, L.P. and any entities and funds affiliated therewith, including without limitation OCM Montrose Holdings, L.P. and OCM Montrose II Holdings, L.P.

(f)    “Transferee” means any transferee of Series A-1 and Series A-2 Preferred Stock which is an Affiliate of either the Sponsor or any other Transferee (including, in each case, the funds, partnerships or other co-investment vehicles managed, advised or controlled thereby but other than, in each case, any portfolio company of any of the foregoing or the Company and its subsidiaries).

ARTICLE IX

EXISTENCE

The Corporation shall have perpetual existence.

ARTICLE X

AMENDMENT

Section 10.1    Amendment of Certificate of Incorporation. The Corporation reserves the right at any time, and from time to time, to amend, alter, change or repeal any provision

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contained in this Certificate of Incorporation (including any Preferred Stock Designation), and other provisions authorized by the laws of the State of Delaware at the time in force may be added or inserted, in the manner now or hereafter prescribed by the laws of the State of Delaware, and all powers, preferences and rights of any nature conferred upon stockholders, directors or any other persons by and pursuant to this Certificate of Incorporation (including any Preferred Stock Designation) in its present form or as hereafter amended are granted subject to this reservation; provided, however, that except as otherwise provided in this Certificate of Incorporation (including any provision of a Preferred Stock Designation that provides for a greater or lesser vote) and in addition to any other vote required by law, the affirmative vote of at least 66²⁄₃% of the voting power of the stock outstanding and entitled to vote thereon, voting together as a single class, shall be required to adopt, amend or repeal, or adopt any provision of this Certificate of Incorporation; provided, however, that in the event a holder or an affiliated group of holders of the Corporation’s Series A-2 preferred stock owns more than 45% of the outstanding common stock of the Corporation, which includes shares of the Corporation’s common stock issued upon conversion of the Corporation’s Series A-2 preferred stock, the affirmative vote of at least a majority of the voting power of the stock outstanding and entitled to vote thereon, voting together as a single class, shall be required for the stockholders to adopt, amend or repeal, or adopt any provision inconsistent with, any provision of this Certificate of Incorporation.

Section 10.2    Amendment of Bylaws. In furtherance and not in limitation of the powers conferred by the laws of the State of Delaware, but subject to the terms of any series of Preferred Stock then outstanding, the Board of Directors is expressly authorized to adopt, amend or repeal the Bylaws of the Corporation. Except as otherwise provided in this Certificate of Incorporation (including the terms of any Preferred Stock Designation that require an additional vote) or the Bylaws of the Corporation, and in addition to any requirements of law, the affirmative vote of at least 66²⁄₃% of the voting power of the stock outstanding and entitled to vote thereon, voting together as a single class, shall be required for the stockholders to adopt, amend or repeal, or adopt any provision inconsistent with, any provision of the Bylaws of the Corporation; provided, however, that in the event a holder or an affiliated group of holders of the Corporation’s Series A-2 preferred stock owns more than 45% of the outstanding common stock of the Corporation, which includes shares of the Corporation’s common stock issued upon conversion of the Corporation’s Series A-2 preferred stock, the affirmative vote of at least a majority of the voting power of the stock outstanding and entitled to vote thereon, voting together as a single class, shall be required for the stockholders to adopt, amend or repeal, or adopt any provision inconsistent with, any provision of the Bylaws of the Corporation.

ARTICLE XI

LIABILITY OF DIRECTORS

Section 11.1    No Personal Liability. To the fullest extent permitted by the DGCL as the same exists or as may hereafter be amended, no director of the Corporation shall be personally liable to the Corporation or its stockholders for monetary damages for breach of fiduciary duty as a director.

Section 11.2    Amendment or Repeal. Any amendment, alteration or repeal of this Article XI that adversely affects any right of a director shall be prospective only and shall not limit or eliminate any such right with respect to any proceeding involving any occurrence or alleged occurrence of any action or omission to act that took place prior to such amendment, alteration or repeal.

ARTICLE XII

FORUM FOR ADJUDICATION OF DISPUTES

Section 12.1    Forum. Unless the Corporation, in writing, selects or consents to the selection of an alternative forum, the sole and exclusive forum for any internal corporate claims (as defined below), to the fullest extent permitted by law, and subject to applicable jurisdictional requirements, shall be the Court of Chancery of the State of Delaware (or, if the Court of Chancery does not have, or declines to accept, jurisdiction, another state court or a federal court located within the State of Delaware). For purposes of this Article XII, “internal corporate claims” means claims, including claims in the right of the Corporation: (a) that are based upon a

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violation of a duty by a current or former director, officer, employee or stockholder in such capacity; or (b) as to which the DGCL confers jurisdiction upon the Court of Chancery. Notwithstanding anything herein to the contrary, and for the avoidance of doubt: (i) this Article XII shall not apply to suits brought to enforce a duty or liability created by the Securities Exchange Act of 1934, as amended; and (ii) unless the Corporation consents in writing to the selection of an alternative forum, the federal district courts of the United States of America shall be the sole and exclusive forum for the resolution of any complaint asserting a cause of action arising under the Securities Act of 1933, as amended.

Section 12.2    Consent to Jurisdiction. If any action the subject matter of which is within the scope of this Article XII is filed in a court other than the Court of Chancery (or, if the Court of Chancery does not have, or declines to accept, jurisdiction, another state court or a federal court located within the State of Delaware) (a “Foreign Action”) by any current or former stockholder (including any current or former beneficial owner), such stockholder shall be deemed to have consented to: (a) the personal jurisdiction of the Court of Chancery (or such other state or federal court located within the State of Delaware, as applicable) in connection with any action brought in any such court to enforce this Article XII; and (b) having service of process made upon such stockholder in any such action by service upon such stockholder’s counsel in the Foreign Action as agent for such stockholder.

Section 12.2    Enforceability. If any provision of this Article XII shall be held to be invalid, illegal or unenforceable as applied to any person or entity or circumstance for any reason whatsoever, then, to the fullest extent permitted by law, the validity, legality and enforceability of such provision in any other circumstance and of the remaining provisions of this Article XII (including, without limitation, each portion of any sentence of this Article XII containing any such provision held to be invalid, illegal or unenforceable that is not itself held to be invalid, illegal or unenforceable) and the application of such provision to other persons or entities or circumstances shall not in any way be affected or impaired thereby.

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IN WITNESS WHEREOF, the Corporation has caused this Amended and Restated Certificate of Incorporation to be executed, signed and acknowledged by Nasym Afsari, the General Counsel and Secretary of the Corporation, this      day of July, 2020.

[SIGNATURE PAGE TO AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF MONTROSE ENVIRONMENTAL GROUP, INC.]