Shares of Tetra Tech, Inc. TTEK have gained 13% in the past month. The impressive performance is supported by solid fundamentals, impressive financial results and healthy growth opportunities. Upward revisions in earnings estimates are reflective of the stock’s strength. TTEK presently carries a Zacks Rank #2 (Buy).Tetra Tech provides engineering, consulting, program management, technical services and construction management. The company is based in Pasadena and has a market capitalization of $10.2 billion.The company belongs to the Zacks Pollution Control industry, which comes under the ambit of the Zacks Industrial Products sector. The industry is among the top 28% of more than 250 Zacks industry. In the past month, the industry has gained 7% while the S&P 500 has jumped 3.1% during the same period. The sector has expanded 3.8% in the past month.Image Source: Zacks Investment ResearchFactors Influencing the StockIn the past month, Tetra Tech delivered impressive results for the fourth quarter of fiscal 2021 (ended Oct 3, 2021). The company’s earnings in the quarter surpassed the Zacks Consensus Estimate by 5%. Also, its sales exceeded estimates by 4.03% and expanded 20% from the year-ago quarter. Healthy segmental sales have been beneficial.Besides its financial performance, Tetra Tech’s solid product offerings and contract wins, a strong backlog of $3,249.9 million and synergistic gains from acquired assets are beneficial. Its businesses are gaining from the U.S. federal, the U.S. commercial and the U.S. state and local customers. Focus on climate change globally, the U.S. infrastructure stimulus and the U.S. administration priorities are likely to support demand.For fiscal 2022 (ending September 2022), Tetra Tech anticipates net revenues to be $2.60-$2.80 billion, implying a rise from $2.55 billion recorded in fiscal 2021. Its adjusted earnings are predicted to be $4.00-$4.20 per share, higher than the $3.79 recorded in fiscal 2021.Tetra Tech’s commitment toward returning values to shareholders raises its appeal. Regarding buyout actions, Applied Industrial acquired Enterprise Automation in October 2021. The buyout is expected to strengthen Tetra Tech’s digital technology solutions for water sector clients.The Zacks Consensus Estimate for Tetra Tech’s earnings per share is pegged at $4.03 for fiscal 2022 (ending September 2022) and $4.49 for fiscal 2023 (ending September 2023), marking increases of 2.3% and 1.8% from the respective 30-day-ago figures. Such upward revisions in earnings estimates reflect healthy operating conditions for the company.Tetra Tech, Inc. Price and Consensus Tetra Tech, Inc. price-consensus-chart | Tetra Tech, Inc. QuoteOther Stocks to ConsiderThree other top-ranked stocks from the sector with their past month price performance are discussed below.Shares of Casella Waste Systems, Inc. CWST have gained 4.3% in the past month. CWST’s performance in the last reported quarter was impressive, with an earnings beat of 25.93%.In the past 30 days, the Zacks Consensus Estimate for Casella Waste’s earnings has increased 10% for 2021 and 6.9% for 2022. The company presently sports a Zacks Rank #1 (Strong Buy). You can see the complete list of today’s Zacks #1 Rank stocks here. Applied Industrial Technologies, Inc.’s AIT shares have gained 4% in the past month. AIT’s results delivered in the last quarter were better than expected, with earnings surpassing estimates by 14.29%.In the past 30 days, the Zacks Consensus Estimate for Applied Industrial’s earnings has increased 1.9% for fiscal 2022 (ending June 2022) and 2.2% for fiscal 2023 (ending June 2023). The AIT stock presently carries a Zacks Rank #2. Energy Recovery, Inc. ERII performed well in the past month, with shares rising 22.5%. ERII’s earnings in the last reported quarter surpassed estimates by 2 cents.In the past 30 days, the Zacks Consensus Estimate for Energy Recovery’s earnings has increased 18.2% for 2021 and 39.3% for 2022. The company presently carries a Zacks Rank #2. 5 Stocks Set to Double Each was handpicked by a Zacks expert as the #1 favorite stock to gain +100% or more in 2021. Previous recommendations have soared +143.0%, +175.9%, +498.3% and +673.0%. Most of the stocks in this report are flying under Wall Street radar, which provides a great opportunity to get in on the ground floor.Today, See These 5 Potential Home Runs >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Tetra Tech, Inc. (TTEK): Free Stock Analysis Report Applied Industrial Technologies, Inc. (AIT): Free Stock Analysis Report Casella Waste Systems, Inc. (CWST): Free Stock Analysis Report Energy Recovery, Inc. (ERII): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research