<SEC-DOCUMENT>0001104659-15-033264-index.html : 20150501
<SEC-HEADER>0001104659-15-033264.hdr.sgml : 20150501
<ACCEPTANCE-DATETIME>20150501172844
ACCESSION NUMBER:		0001104659-15-033264
CONFORMED SUBMISSION TYPE:	S-8
PUBLIC DOCUMENT COUNT:		4
FILED AS OF DATE:		20150501
DATE AS OF CHANGE:		20150501
EFFECTIVENESS DATE:		20150501

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:		S-8
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-203817
		FILM NUMBER:		15825684

	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>S-8
<SEQUENCE>1
<FILENAME>a15-9826_1s8.htm
<DESCRIPTION>S-8
<TEXT>
Document 1 - file: a15-9826_1s8.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-4.4
<SEQUENCE>2
<FILENAME>a15-9826_1ex4d4.htm
<DESCRIPTION>EX-4.4
<TEXT>
Document 2 - file: a15-9826_1ex4d4.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>3
<FILENAME>a15-9826_1ex5d1.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 3 - file: a15-9826_1ex5d1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>4
<FILENAME>a15-9826_1ex23d1.htm
<DESCRIPTION>EX-23.1
<TEXT>
Document 4 - file: a15-9826_1ex23d1.htm

</DOCUMENT>
</SEC-DOCUMENT>