water in Colombia

The cleanest water in Colombia is the Bogota's one but naturaly its the dirtiest one ( refering to the bogota's lake), because all wastes we throw to the rivers, the ocean polutes too making Barranquilla's Cartagena's Santamarta's and many other water that is in the coasts, principally that places have the worst water, not only because the rivers that contaminates the ocean, it is also because the ports that have boats with chemics that in most of the times, because
accidents, go to the ocean, and because the oceans feed the river's flow, so the zones in Colombia in which river's flow are feed by the contaminated oceans have the unhealthiest water in Colombia, but not only the worse water in the rivers, but in the fresh water we use to take showers because, if the river's water is very poluted its going to be hard to clean it to take showers, so the water we use to take showers will not be totaly cleaned, but, Why if in Bogota the river is so poluted the fresh water used to take showers, drink and wash the hands is the cleanest in Colombia? Easy, the water descontamination technology, Bogota is the city with most technology in Colombia so water descontamination is easiest, and also because in Bogota the water descontamination plants dont use too much Bogota's river water, they use a cleanest one.
In conclution, the contamination in Colombia's rivers and fresh water depends in many factors, like the ocean, water descontamination technology level, and any kind of wastes the Colombia's people throw to the rivers.