Tetra Tech (NASDAQ:TTEK) reported quarterly earnings of $0.35 per share which beat the analyst consensus estimate of $0.31 by 11.82 percent. This is unchanged from the same period last year. The company reported quarterly sales of $1.037 billion which beat the analyst consensus estimate of $975.550 million by 6.30 percent. This is a 13.37 percent decrease over sales of $1.197 billion the same period last year.