According to Tetra Tech 's latest financial reports the company's current revenue (TTM ) is €5.01 Billion. In 2023 the company made a revenue of €4.39 Billion an increase over the revenue in the year 2022 that were of €3.30 Billion. The revenue is the total amount of income that a company generates by the sale of goods or services. Unlike with the earnings no expenses are subtracted.