TETRA TECH INC revenue for the last year amounted to 3.88 B EUR, the most of which — 2.50 B EUR — came from its highest performing source at the moment, Commercial/International Services Group, the year earlier bringing 2.29 B EUR. The greatest contribution to the revenue figure was made by United States — last year it brought TETRA TECH INC 2.87 B EUR, and the year before that — 2.71 B EUR.