As can be seen from the above four pictures, waste water is being discharged to an open space by a large percentage of households and small industries in Phnom Penh without any proper treatment. This causes many types of pollution to poor people, for example smell pollution to those living along the open sewage and at the downstream. Also, poor children are playing near that waste water every day. They are likely to have chances infected by the viruses attached to their hands. Moreover, with the disappearance of Boeung Kok, this lake can hardly serve as the natural treatment plant before discharge the waste water into the river and serve as flood mitigation for Phnom Penh city. Unfortunately, this lake is being filled with sand that is likely to cover the whole lake like the previous one due to the development of city without the thought of environment. It is the fact that the country development is unstoppable, but we should either leave the lake to discharge waste water or build a proper treatment plant which can reduce many contagious diseases to poor people and maintain the cost of potable water in the future.