The availability of water resources in Colombia is quantified through estimation of the disorder degree of precipitation records and their distribution during the annual cycle. Disorder is quantified by using two different measures of entropy, the so­called Intensity entropy (IE) and apportionment entropy (AE). The first one measures disorder of the complete precipitation record, whereas the second one measures disorder of the monthly distribution of water availability during the seasonal cycle. Such entropy measures (IE and AE) allow defining criteria to classify the potential availability of water resources, by using simple and k­Means clustering classification algorithms. Our analysis is performed to monthly records of precipitation in 108 raingauges located in Colombia. Our results allow the classification of wet and dry regions for Colombia.