I identify the boundaries at plastic manufacturing and food processing plant because these plant are really near river and public water system. In addition to, these plants are still processing. Even if, the community has the other plant and source which release waste water into river, they are farther from the river than these plants. The wastewater is flow and dilute concentration pollutant by itself and every source have to have the wastewater treatment system which are belong with them. So, I would like to identify the boundaries and safety system to control the wastewater before release to the river for the plants.