In the upper area of Klong Saen-Saeb, people still make living from agriculture. They use chemical pesticides, for example, to eliminate undesired weeds and animals. Hence, chemicals that are not supposed to transmit to Klong Saen-Saeb are transmit to it.
Moreover, there are numbers of office and industrial buildings. These employees and factory men use Klong Saen-Saeb express boat service for transportation and these boats emit fuel and sound pollution in the canal.