<SEC-DOCUMENT>0001104659-23-004232-index.html : 20230117
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<ACCEPTANCE-DATETIME>20230117160052
ACCESSION NUMBER:		0001104659-23-004232
CONFORMED SUBMISSION TYPE:	DEF 14A
PUBLIC DOCUMENT COUNT:		39
CONFORMED PERIOD OF REPORT:	20230228
FILED AS OF DATE:		20230117
DATE AS OF CHANGE:		20230117

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:			1002

	FILING VALUES:
		FORM TYPE:		DEF 14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-19655
		FILM NUMBER:		23531549

	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>
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<TYPE>DEF 14A
<SEQUENCE>1
<FILENAME>tm233327-1_def14a.htm
<DESCRIPTION>DEF 14A
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Document 1 - file: tm233327-1_def14a.htm

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<FILENAME>bc_1yrtsr-pn.jpg
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Document 2 - file: bc_1yrtsr-pn.jpg

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<FILENAME>bc_3yrtsr-pn.jpg
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Document 3 - file: bc_3yrtsr-pn.jpg

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<FILENAME>bc_nominee-pn.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: bc_nominee-pn.jpg

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<FILENAME>bc_targettdc-pn.jpg
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Document 5 - file: bc_targettdc-pn.jpg

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<FILENAME>cv_obc-4c.jpg
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Document 6 - file: cv_obc-4c.jpg

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<FILENAME>cv_ofc-4c.jpg
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Document 7 - file: cv_ofc-4c.jpg

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<FILENAME>fc_aip-pn.jpg
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Document 8 - file: fc_aip-pn.jpg

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<FILENAME>fc_aipaward-pn.jpg
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Document 9 - file: fc_aipaward-pn.jpg

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Document 10 - file: fc_areas-pn.jpg

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Document 11 - file: ic_donot-pn.gif

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<FILENAME>ic_tick-pn.gif
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Document 12 - file: ic_tick-pn.gif

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<FILENAME>lg_tetratech-4c.jpg
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Document 13 - file: lg_tetratech-4c.jpg

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<FILENAME>pc_annual-pn.jpg
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Document 14 - file: pc_annual-pn.jpg

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<FILENAME>pc_ceoneo-pn.jpg
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Document 15 - file: pc_ceoneo-pn.jpg

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<FILENAME>pc_directordiversity-pn.jpg
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Document 16 - file: pc_directordiversity-pn.jpg

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<FILENAME>pc_directornominees-pn.jpg
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Document 17 - file: pc_directornominees-pn.jpg

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Document 18 - file: ph_christianaobiaya-bwlr.jpg

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<FILENAME>ph_danbatrack-bw.jpg
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Document 19 - file: ph_danbatrack-bw.jpg

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<FILENAME>ph_danbatrack-bwlr.jpg
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Document 20 - file: ph_danbatrack-bwlr.jpg

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<FILENAME>ph_garyrbirken-bwlr.jpg
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Document 21 - file: ph_garyrbirken-bwlr.jpg

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<FILENAME>ph_kenneththom-bwlr.jpg
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Document 22 - file: ph_kenneththom-bwlr.jpg

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<FILENAME>ph_kimberlyrit-bwlr.jpg
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Document 23 - file: ph_kimberlyrit-bwlr.jpg

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<TYPE>GRAPHIC
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<FILENAME>ph_kirstenvolp-bwlr.jpg
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Document 24 - file: ph_kirstenvolp-bwlr.jpg

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<FILENAME>ph_maguirejoanne22-bw.jpg
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Document 25 - file: ph_maguirejoanne22-bw.jpg

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<FILENAME>ph_prashantgandhi-bwlr.jpg
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Document 26 - file: ph_prashantgandhi-bwlr.jpg

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<FILENAME>px_annual-bw.jpg
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Document 27 - file: px_annual-bw.jpg

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<FILENAME>px_scanto-bw.jpg
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Document 28 - file: px_scanto-bw.jpg

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<FILENAME>sg_danbatrack-bw.jpg
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Document 29 - file: sg_danbatrack-bw.jpg

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<FILENAME>sg_prestonhopson-bw.jpg
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Document 30 - file: sg_prestonhopson-bw.jpg

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<FILENAME>tbl_awardbusiness-pn.jpg
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Document 31 - file: tbl_awardbusiness-pn.jpg

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<FILENAME>tbl_ceoneo-pn.jpg
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Document 32 - file: tbl_ceoneo-pn.jpg

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<FILENAME>tbl_outreach-pn.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 33 - file: tbl_outreach-pn.jpg

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<TYPE>GRAPHIC
<SEQUENCE>34
<FILENAME>tbl_tenure-pn.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 34 - file: tbl_tenure-pn.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>35
<FILENAME>tm2025328d89-icon_interpn.jpg
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Document 35 - file: tm2025328d89-icon_interpn.jpg

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<TYPE>GRAPHIC
<SEQUENCE>36
<FILENAME>tm2025328d89-icon_mailpn.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 36 - file: tm2025328d89-icon_mailpn.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>37
<FILENAME>tm2025328d89-icon_personpn.jpg
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Document 37 - file: tm2025328d89-icon_personpn.jpg

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<DOCUMENT>
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<SEQUENCE>38
<FILENAME>tm2025328d89-icon_telepn.jpg
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Document 38 - file: tm2025328d89-icon_telepn.jpg

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<DOCUMENT>
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<FILENAME>tm2025328d89-icon_waterpn.jpg
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Document 39 - file: tm2025328d89-icon_waterpn.jpg

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