Tetra Tech (TTEK) 10-K 2019 FY Annual report

EXHIBIT 32.1

Certification of Chief Executive Officer Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Annual Report of Tetra Tech, Inc. (the "Company") on Form 10-K for the fiscal year ended September 29, 2019, as filed with the Securities and Exchange Commission on the date hereof (the "Report"), I, Dan L. Batrack, Chief Executive Officer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

1.The Report fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 27, 2019	/s/ DAN L. BATRACK
	Dan L. Batrack Chairman and Chief Executive Officer (Principal Executive Officer)

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to Tetra Tech, Inc. and will be retained by Tetra Tech, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

The foregoing certification is being furnished to the Securities and Exchange Commission as an exhibit to the Form 10-K and shall not be considered filed as part of the Form 10-K.