Abstract : Global demand for food is increasing pressure on natural resources due to intensification of production systems. Among the aquaculture activities, the shrimp farming in mundial ambit is growing rapidly in recent years. In Brazil this activity undergoes a slight expansion associated with reduced of productivity. In the last years, the marine shrimp production systems have been upgraded and solutions without water exchange presented operational success. Soil sealing, important characteristic of intensive cropping systems, can provide changes in the dynamics of total phosphorus concentration in the water column. The objective of this study was to identify the total phosphorus input by the intensive cultivation of Litopenaeus vannamei in ponds lined with waterproof geomembrane, using two methods of evaluation of environmental impact: maximum permissible load and gray water footprint. The study was conducted at the Experimental Farm Yakult - UFSC. The results obtained from water analysis during the harvesting indicated average concentration of total phosphorus in the effluent of 2.68 mg L¯¹. The estimated maximum permissible load of total phosphorus supported by Lagoa da Cruz has not been exceeded by the effluent generated by the farm, excluding other sources of pollution. The water footprint resulted in a water volume of 68% used in production. In the short term were observed harmful effects of Yakult-UFSC farm on Lagoa da Cruz. It is recommended to long-term impact evaluation to observe the ripple effects in the aquatic ecosystem.