EXHIBIT 16.1 July 1, 2002 Office of the Chief Accountant SECPS Letter File Securities and Exchange Commission Mail Stop 11-3 450 Fifth Street, N. W. Washington, D.C. 20549 Re: Quanta Services, Inc. Dear Sir/Madam: The representations made in this letter are based solely on discussion with and representation from the engagement partner on the audits of the financial statements of this registrant for the two most recent fiscal years. This individual is no longer with Arthur Andersen LLP. We have read Item 4 included in the Form 8-K dated June 28, 2002 of Quanta Services, Inc. (Commission File Number 1-13831) to be filed with the Securities and Exchange Commission and have found no basis for disagreement with the statements contained therein. Very truly yours, /s/ Arthur Andersen LLP - ----------------------------- ARTHUR ANDERSEN LLP Copy to: Mr. James H. Haddox Chief Financial Officer Quanta Services, Inc. 1360 Post Oak Boulevard, Suite 2100 Houston, Texas 77056