<SEC-DOCUMENT>0000831641-18-000168-index.html : 20181121
<SEC-HEADER>0000831641-18-000168.hdr.sgml : 20181121
<ACCEPTANCE-DATETIME>20181121200259
ACCESSION NUMBER:		0000831641-18-000168
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20181120
FILED AS OF DATE:		20181121
DATE AS OF CHANGE:		20181121

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Amidon Derek G
		CENTRAL INDEX KEY:			0001721981

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-19655
		FILM NUMBER:		181199071

	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:			0930

	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>4
<SEQUENCE>1
<FILENAME>wf-form4_154284856368174.xml
<DESCRIPTION>FORM 4
<TEXT>
Document 1 - file: wf-form4_154284856368174.html

Document 1 - RAW XML: wf-form4_154284856368174.xml

</DOCUMENT>
</SEC-DOCUMENT>