<SEC-DOCUMENT>0000831641-18-000050-index.html : 20180801
<SEC-HEADER>0000831641-18-000050.hdr.sgml : 20180801
<ACCEPTANCE-DATETIME>20180801163355
ACCESSION NUMBER:		0000831641-18-000050
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		3
CONFORMED PERIOD OF REPORT:	20180730
FILED AS OF DATE:		20180801
DATE AS OF CHANGE:		20180801

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Birkenbeuel Gary
		CENTRAL INDEX KEY:			0001748476

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-19655
		FILM NUMBER:		18985243

	MAIL ADDRESS:	
		STREET 1:		3475 EAST FOOTHILL BOULEVARD
		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_153315561816818.xml
<DESCRIPTION>FORM 3
<TEXT>
Document 1 - file: wf-form3_153315561816818.html

Document 1 - RAW XML: wf-form3_153315561816818.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>poagarybirkenbeuel072620.htm
<DESCRIPTION>NEW POA BIRKENBEUEL
<TEXT>
Document 2 - file: poagarybirkenbeuel072620.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>poagarybirkenbeuel072620001.jpg
<DESCRIPTION>NEW POA BIRKENBEUEL
<TEXT>
Document 3 - file: poagarybirkenbeuel072620001.jpg

</DOCUMENT>
</SEC-DOCUMENT>