<SEC-DOCUMENT>0001104659-18-005486-index.html : 20180131 <SEC-HEADER>0001104659-18-005486.hdr.sgml : 20180131 <ACCEPTANCE-DATETIME>20180131162705 ACCESSION NUMBER: 0001104659-18-005486 CONFORMED SUBMISSION TYPE: 8-K PUBLIC DOCUMENT COUNT: 3 CONFORMED PERIOD OF REPORT: 20180131 ITEM INFORMATION: Results of Operations and Financial Condition ITEM INFORMATION: Other Events ITEM INFORMATION: Financial Statements and Exhibits FILED AS OF DATE: 20180131 DATE AS OF CHANGE: 20180131 FILER: COMPANY DATA: COMPANY CONFORMED NAME: TETRA TECH INC CENTRAL INDEX KEY: 0000831641 STANDARD INDUSTRIAL CLASSIFICATION: SERVICES-ENGINEERING SERVICES [8711] IRS NUMBER: 954148514 STATE OF INCORPORATION: DE FISCAL YEAR END: 0928 FILING VALUES: FORM TYPE: 8-K SEC ACT: 1934 Act SEC FILE NUMBER: 000-19655 FILM NUMBER: 18563071 BUSINESS ADDRESS: STREET 1: 3475 EAST FOOTHILL BOULEVARD CITY: PASADENA STATE: CA ZIP: 91107 BUSINESS PHONE: 6263514664 MAIL ADDRESS: STREET 1: 3475 EAST FOOTHILL BOULEVARD CITY: PASADENA STATE: CA ZIP: 91107 </SEC-HEADER> <DOCUMENT> <TYPE>8-K <SEQUENCE>1 <FILENAME>a18-3920_18k.htm <DESCRIPTION>8-K <TEXT> Document 1 - file: a18-3920_18k.htm
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</DOCUMENT> <DOCUMENT> <TYPE>GRAPHIC <SEQUENCE>3 <FILENAME>g39201mm01i001.jpg <DESCRIPTION>GRAPHIC <TEXT> Document 3 - file: g39201mm01i001.jpg
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