The result is suffocation of many living organisms in the water that require dissolved oxygen. Much wildlife dies as a result of this pollution. Another problem is sewage dumping. Although this situation may seem good, given that a tremendous surge in plant and especially algae growth occurs, in fact, it is tragic. After the bloom season passes, all the formerly living surplus plants die, and decompose.
Decomposition requires oxygen.
When there is more detritus decomposing than any given ecosystem can support, the dissolved oxygen level drops dangerously low. This process is called eutrophication, and can ruin a body of water. A major source of fresh water is today s society is ground water. This water is usually stored in aquifers, or underground waterways. Sometimes, these aquifers are drained excessive and cannot be filled in time to meet their original water amount.