Tetra Tech (NASDAQ:TTEK) reported quarterly earnings of $0.42 per share which beat the analyst consensus estimate of $0.40 by 5 percent. This is a 2.44 percent increase over earnings of $0.41 per share from the same period last year. The company reported quarterly sales of $1.110 billion which beat the analyst consensus estimate of $1.081 billion by 2.68 percent. This is a 18.98 percent decrease over sales of $1.370 billion the same period last year.