AMENDED AND RESTATED SECURITY AGREEMENT

EXHIBIT 10.7

AMENDED AND RESTATED SECURITY AGREEMENT

     1. GRANT OF SECURITY INTEREST. For valuable consideration, the undersigned GLOBAL WATER RESOURCES L.L.C., a Delaware limited liability company, GLOBAL WATER MANAGEMENT, LLC, a Delaware limited liability company and GLOBAL WATER RESOURCES, INC., a Delaware corporation (each individually and collectively, the “Debtor”), hereby grants and transfers to WELLS FARGO BANK, NATIONAL ASSOCIATION (“Bank”) a security interest in all of the property of Debtor described as follows (collectively, the “Collateral”):

     (a) all accounts, deposit accounts, contract rights, chattel paper (whether electronic or tangible), instruments, promissory notes, documents, general intangibles, payment intangibles, software, letter of credit rights, health-care insurance receivables and other rights to payment of every kind now existing or at any time hereafter arising;

     (b) all inventory, goods held for sale or lease or to be furnished under contracts for service, or goods so leased or furnished, raw materials, component parts, work in process and other materials used or consumed in Debtor’s business, now or at any time hereafter owned or acquired by Debtor, wherever located, and all products thereof, whether in the possession of Debtor, any warehousemen, any bailee or any other person, or in process- of delivery, and whether located at Debtor’s places of business or elsewhere;

     (c) all warehouse receipts, bills of sale, bills of lading and other documents of every kind (whether or not negotiable) in which Debtor now has or at any time hereafter acquires any interest, and all additions and accessions thereto, whether in the possession or custody of Debtor, any bailee or any other person for any purpose;

     (d) all money and property heretofore, now or hereafter delivered to or deposited with Bank or otherwise coming into the possession, custody or control of Bank (or any agent or bailee of Bank) in any manner or for any purpose whatsoever during the existence of this Agreement and whether held in a general or special account or deposit for safekeeping or otherwise;

     (e) all right, title and interest of Debtor under licenses, guaranties, warranties, management agreements, marketing or sales agreements, escrow contracts, indemnity agreements, insurance policies, service or maintenance agreements, supporting obligations and other similar contracts of every kind in which Debtor now has or at any time hereafter shall have an interest;

     (f) all goods, tools, machinery, furnishings, furniture and other equipment and fixtures of every kind now existing or hereafter acquired, and all improvements, replacements, accessions and additions thereto and embedded software included therein, whether located on any property owned or leased by Debtor or elsewhere, including without limitation, any of the foregoing now or at any time hereafter located at or installed on the land or in the improvements at any of the real property owned or leased by Debtor, and all such goods after they have been severed and removed from any of said real property; and

     (g) all motor vehicles, trailers, mobile homes, manufactured homes, boats, other rolling stock and related equipment of every kind now existing or hereafter acquired and all

additions and accessories thereto, whether located on any property owned or leased by Debtor or elsewhere;

together with whatever is receivable or received when any of the foregoing or the proceeds thereof are sold, leased, collected, exchanged or otherwise disposed of, whether such disposition is voluntary or involuntary, including without limitation, all rights to payment, including returned premiums, with respect to any insurance relating to any of the foregoing, and all rights to payment with respect to any claim or cause of action affecting or relating to any of the foregoing (collectively, “Proceeds”).

     2. OBLIGATIONS SECURED. The obligations secured hereby are the payment and performance of: (a) all present and future Indebtedness of Debtor to Bank with respect to that certain Thirty-Five Million and No/100 Dollar ($35,000,000.00) Revolving Line of Credit transaction as more fully described in that certain Amended and Restated Credit Agreement of even date herewith (the “Credit Agreement”); and (c) all obligations of Debtor and rights of Bank under this Agreement. The word “Indebtedness” is used herein in its most comprehensive sense and includes any and all advances, debts, obligations and liabilities of Debtor heretofore, now or hereafter made, incurred or created in connection with the Credit Agreement, whether voluntary or involuntary and however arising, whether due or not due, absolute or contingent, liquidated or unliquidated, determined or undetermined, and whether Debtor may be liable individually or jointly with others, or whether recovery upon such Indebtedness may be or hereafter becomes unenforceable.

     3. TERMINATION. This Agreement will terminate upon the performance of all obligations of Debtor to Bank, including without limitation, the payment of all Indebtedness of Debtor to Bank, and the termination of all commitments of Bank to extend credit to Debtor, existing at the time Bank receives written notice from Debtor of the termination of this Agreement.

     4. OBLIGATIONS OF BANK. Bank has no obligation to make any loans hereunder. Any money received by Bank in respect of the Collateral may be deposited, at Bank’s option, into a non-interest bearing account over which Debtor shall have no control, and the same shall, for all purposes, be deemed Collateral hereunder.

     5. REPRESENTATIONS AND WARRANTIES. Debtor represents and warrants to Bank that: (a) Debtor’s legal name is exactly as set forth on the first page of this Agreement, and all of Debtor’s organizational documents or agreements delivered to Bank are complete and accurate in every respect; (b) Debtor is the owner and has possession or control of the Collateral and Proceeds; (c) Debtor has the exclusive right to grant a security interest in the Collateral and Proceeds; (d) all Collateral and Proceeds are genuine, free from liens, adverse claims, setoffs, default, prepayment, defenses and conditions precedent of any kind or character, except the lien created hereby or as otherwise agreed to by Bank, or as heretofore disclosed by Debtor to Bank, in writing; (e) all statements contained herein and, where applicable, in the Collateral are true and complete in all material respects; (f) no financing statement covering any of the Collateral or Proceeds, and naming any secured party other than Bank, is on file in any public office; (g) where Collateral consists of rights to payment, all persons appearing to be obligated on the Collateral and Proceeds have authority and capacity to contract and are bound as they appear to be, all property subject to chattel paper has been properly registered and filed in compliance with law and to perfect the interest of Debtor in such property, and all such Collateral and Proceeds comply with all applicable laws concerning form, content and manner of preparation and execution, including where applicable Federal Reserve

Regulation Z and any State consumer credit laws; and (h) where the Collateral consists of equipment, Debtor is not in the business of selling goods of the kind included within such Collateral, and Debtor acknowledges that no sale or other disposition of any such Collateral, including without limitation, any such Collateral which Debtor may deem to be surplus, has been consented to or acquiesced in by Bank, except as specifically set forth in writing by Bank.

     6. COVENANTS OF DEBTOR

     (a) Debtor agrees in general: (i) to pay Indebtedness secured hereby when due; (ii) to indemnify Bank against all losses, claims, demands, liabilities and expenses of every kind caused by property subject hereto; (iii) to pay all reasonable costs and expenses, including reasonable attorneys’ fees, incurred by Bank in the perfection and preservation of the Collateral or Bank’s interest therein and/or the realization, enforcement and exercise of Bank’s rights, powers and remedies hereunder; (iv) to permit Bank to exercise its powers; (v) to execute and deliver such documents as Bank reasonably deems necessary to create, perfect and continue the security interests contemplated hereby; (vi) not to change its name, and as applicable, its chief executive office, its principal residence or the jurisdiction in which it is organized and/or registered without giving Bank prior written notice thereof; (vii) not to change the places where Debtor keeps any Collateral or Debtor’s records concerning the Collateral and Proceeds without giving Bank prior written notice of the address to which Debtor is moving same; and (viii) to cooperate with Bank in perfecting all security interests granted herein and in obtaining such agreements from third parties as Bank reasonably deems necessary, proper or convenient in connection with the preservation, perfection or enforcement of any of its rights hereunder.

     (b) Debtor agrees with regard to the Collateral and Proceeds, unless Bank agrees otherwise in writing: (i) that Bank is authorized to file financing statements in the name of Debtor to perfect Bank’s security interest in Collateral and Proceeds; (ii) where applicable, to insure the Collateral with Bank named as loss payee, in form, substance and amounts, under agreements, against risks and liabilities, and with insurance companies reasonably satisfactory to Bank; (iii) where applicable, to operate the Collateral in accordance with all applicable statutes, rules and regulations relating to the use and control thereof, and not to use any Collateral for any unlawful purpose or in any way that would void any insurance required to be carried in connection therewith; (iv) not to remove the Collateral from Debtor’s premises, except (A) for deliveries to buyers in the ordinary course of Debtor’s business and (B) Collateral which consists of mobile goods as defined in the Arizona Uniform Commercial Code, in which case Debtor agrees not to remove or permit the removal of such Collateral from its state of domicile for a period in excess of thirty (30) calendar days; (v) to pay when due all license fees, registration fees and other charges in connection with any Collateral; (vi) not to permit any lien on the Collateral or Proceeds, including without limitation, liens arising from repairs to or storage of the Collateral, except in favor of Bank; (vii) not to sell, hypothecate or dispose of, nor permit the transfer by operation of law of, any of the Collateral or Proceeds or any interest therein, except sales of inventory to buyers in the ordinary course of Debtor’s business; (viii) to permit Bank to inspect the Collateral at any time upon