Tetra Tech (NASDAQ:TTEK) reported quarterly earnings of $0.34 per share which beat the analyst consensus estimate of $0.32 by 6.25 percent. This is a 3.03 percent increase over earnings of $0.33 per share from the same period last year. The company reported quarterly sales of $1.220 billion which beat the analyst consensus estimate of $1.003 billion by 21.70 percent. This is a 7.70 percent decrease over sales of $1.322 billion the same period last year.