Entity Information

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Economic entity name	TETRA TECH INC
CIK	0000831641
Accession number	0001047469-16-016906
Generator	Merrill
SEC filing page	http://www.sec.gov/Archives/edgar/data/831641/000104746916016906/0001047469-16-016906-index.htm
XBRL Instance	http://www.sec.gov/Archives/edgar/data/831641/000104746916016906/ttek-20161002.xml
XBRL Cloud Viewer	https://edgardashboard.xbrlcloud.com/flex/viewer/XBRLViewer.html#instance=http://www.sec.gov/Archives/edgar/data/831641/000104746916016906/ttek-20161002.xml