Rural and farm pollution is known as surface-source pollution. That is another important reason for causing the worsening water quality of rivers and lakes. The first reason is the pollution causing by industrial wastewater and domestic sewage. After realizing the total control of industrial pollution source emission and quickening the construction of urban sewage and wastewater treatment plants, the influence of surface source pollution will be extruded.

A monitoring report from Dianchi Lake proves that the concentration of phosphor and nitrogen polluted by the surface polluters reaches 64% and 52/7% of the total...

The surface-source pollution includes the chemical fertilizer and pesticide following the farmland pathway and the untreated rural domestic solid wastes floating into rivers and lakes. Investigation shows that breeding a cattle will produce wastewater beyond the sewage produced by 22 persons and breeding a pig will produce the wastewater equal to the sewage produced by seven people...