High Quality Content by WIKIPEDIA articles! Water supply and sanitation in Colombia has been improved in many ways over the past decades. Between 1990 and 2004, access to sanitation increased from 82% to 86%, but access to water increased only slightly from 92% to 93%.. In particular, coverage in rural areas lags behind. Furthermore, despite improvements, the quality of water and sanitation services remains inadequate. For example, only 72% of those receiving public services receive water of potable quality and in 2006 only 25% of the wastewater generated in the country underwent any kind of treatment.