Turbid water from well

Hi, We have a well in our colony. We are using water of this well from 4-5 years. But from last 4 months we found that turbid water comes in our well. We think this water comes from the gutter which is behind our society (approx 150 metres) but we are not sure about this. After some checking we know that already 4-5 wells are not in use near our society. So, can you help us we are facing too much problems.