<SEC-DOCUMENT>0001104659-20-004319-index.html : 20200115
<SEC-HEADER>0001104659-20-004319.hdr.sgml : 20200115
<ACCEPTANCE-DATETIME>20200115160842
ACCESSION NUMBER:		0001104659-20-004319
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20200115
DATE AS OF CHANGE:		20200115
EFFECTIVENESS DATE:		20200115

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:			0929

	FILING VALUES:
		FORM TYPE:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-19655
		FILM NUMBER:		20528392

	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>DEFA14A
<SEQUENCE>1
<FILENAME>a20-1634_3defa14a.htm
<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: a20-1634_3defa14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g16343bii001.gif
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g16343bii001.gif

</DOCUMENT>
</SEC-DOCUMENT>