The study evaluated the potential of rainwater utilization in Belém-PA, with emphasis on the economic viability of the residential consumer perception and the reflection in spending on the production of drinking water by the supply utility. In quantifying the utilization system was used the method of Ghisi et al. (2006). Was using a precipitation temporality series in the 30-year period (1984-2013), the database of the National Institute of Meteorology (INMET). The historical series of precipitation indicated that Belém has two defined periods in the year, a rainy December to May, and another less rainy June to November, the fact that Belém does not display completely dry periods. For the analysis of economic viability in the view of the residential customer was prepared two scenarios, with and without the deployment costs of utilization system. Obtaining the first scenery unfeasible, and the second economically viable. In the perspective of supply concessionaire, the use is economically viable.
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