The causes of poor of water quality are these: 1. Shortage of land to build houses, 2. Littering, 3. Lifestyle they living, 4. Overloaded of the system led to no retention time of water to settled, 5. Too much population led to air pollution, and etc.

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The causes of poor of water quality are these:

1. Shortage of land to build houses,

2. Littering,

3. Lifestyle they living,

4. Overloaded of the system led to no retention time of water to settled,

5. Too much population led to air pollution, and etc.