If there is no waste water treatment system performance enough to let the water out into a high-quality industrial estate outside more than standard and will be harmful to an ecosystem of organisms both in the water and on land
-If there are no wastewater treatment system performance. To make the sewage discharged to the outside with high-quality estates exceeding standards and will harm the ecology of creatures both in water and on land.
If a septic system is not effective enough. To make the wastewater discharged to the outside of a settlement with the high quality of standard. And would harm the ecology of the species, both in water and on land.