In traditional agriculture the use of pesticides is a common practice among tomatoes farmers due to the prevalent pest and disease problems. Pesticides are products that have improved agricultural productivity, although their inherent toxicity and misuse have led to various adverse effects on important ecosystems and human health. It has been shown that the use of pesticides in a Good Agricultural Practices (GAP) system is a production strategy that ensures sustainability and competitiveness. An environmentfriendly agricultural production and a contribution to the health of workers, consumers and other stakeholders in the food chain, facilitate trade and international opportunities. Investigations to measure the impact of pesticides on ecosystems have shown that these products influence diversity of species in the food chain, energy flow, nutrient cycling and general system stability.These investigations, however, have aimed to determine the degree of pollution of soil, water, and air, without fully recognizing the interaction of these factors as a whole. Environmental impact studies are a more comprehensive analysis with which decisions can be taken based on one or more environmental indicators. These studies are a basic support for agricultural production processes, especially when they attempt to incorporate sustainable processes. The environmental hazard has been estimated using a method that asses the environmental impact of pesticides, the so-called Environmental Impact Quotient method (EIQ) and developed by Kovach et al. (1992).The EIQ is regarded as relatively easy to use and has been presented in the scientific literature as a useful tool for estimating potential environmental hazards associated with agricultural pesticide use in diverse environments.There are two categories of values for EIQ, one of them is called “base environmental impact quotient” and it has been established for each molecule of pesticide (active ingredient of the agrochemical) and the toxic effect on workers, pickers, consumers, fish, birds, bees and beneficial arthropods must be taken into account for calculating this value. The other one is called “field environmental impact quotient”, and is calculated for the agrochemical products used by the farmers and the correlation of the base EIQ value, active ingredient percentage, quantity of the product used, field size and frequency of application of the product are used for calculating this value (Feola, 2011).