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In this work the results of spectrophotometric assays performed on samples taken from the waters of ownership of organic products, located in the municipality of Paranaguá, as well as other physical and chemical testing of these samples are presented. They were conducted to evaluate the tissue property. The spectrophotometric assays were performed to quantify the chemical element phosphorus by the molybdenum blue method and nitrogen chemical element methods by Griess and Indophenol. These chemicals have low natural availability and macronutrients are important for the growth of plants. With the results it was found that the concentrations of the element nitrogen are below the limits specified by Resolution 357/2005 of CONAMA. Have phosphate ions showed higher concentrations in the water samples were taken from two specific points of organic property. In the samples from the first sampling point was observed that the levels of phosphate present were higher than the results obtained from samples taken from the second point, indicating that high phosphate concentration is likely due to high levels of soil phosphates and not an anthropic deposit held by the farmer. Thus it is concluded that the high concentration of phosphate ion is natural.