<SEC-DOCUMENT>0000831641-18-000066-index.html : 20181107
<SEC-HEADER>0000831641-18-000066.hdr.sgml : 20181107
<ACCEPTANCE-DATETIME>20181107171914
ACCESSION NUMBER:		0000831641-18-000066
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		3
CONFORMED PERIOD OF REPORT:	20181104
FILED AS OF DATE:		20181107
DATE AS OF CHANGE:		20181107

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			O'Rourke Brendan M.
		CENTRAL INDEX KEY:			0001758350

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-19655
		FILM NUMBER:		181167407

	MAIL ADDRESS:	
		STREET 1:		3475 E FOOTHILL BLVD
		CITY:			PASADENA
		STATE:			CA
		ZIP:			91107

ISSUER:		

	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

	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>3
<SEQUENCE>1
<FILENAME>wf-form3_154162913781970.xml
<DESCRIPTION>FORM 3
<TEXT>
Document 1 - file: wf-form3_154162913781970.html

Document 1 - RAW XML: wf-form3_154162913781970.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>poabrendanmorourke111201.htm
<DESCRIPTION>POA OROURKE 1
<TEXT>
Document 2 - file: poabrendanmorourke111201.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>poabrendanmorourke111201001.jpg
<DESCRIPTION>POA OROURKE 2
<TEXT>
Document 3 - file: poabrendanmorourke111201001.jpg

</DOCUMENT>
</SEC-DOCUMENT>