The study of water quality is essential, both to characterize the consequences of a particular polluting activity, and to establish the means to satisfy a given water use. This work aimed to contribute to environmental agencies through analyzes of acid rain, to identify a possible presence of acidity in rainwater drained from buildings, as well as parameters related to impacts. The methodology used for the analysis of runoff water was the Standard Methods for the Examination of Water and Wastewater, 2012. The collections carried out in the fall pipes of the rainwater drainage in the Boa Vista neighborhood, had expressive pH values, in which for the drained water the highest value was 8.4 and the lowest 4.3. In the case of rainwater, the highest value was 9.35 and the lowest was 3.56. In the other studied locations, the pH values found were higher compared to the Boa Vista neighborhood, suggesting that it is a potentially polluting region.