Will it affect the feng shui of the home if many people use their own water wells?

Your problem does not affect Feng Shui, but there is something wrong with your home’s Feng Shui. The so-called Feng Shui refers to wind and water. Both of these directly affect living conditions. Why is it necessary to build a house in Beitou South? Because this is the only way to ensure warm winters and cool summers, sufficient sunshine, etc... If the well water turns yellow, it must be because the anti-seepage treatment has not been done well, and dirty surface water has seeped into the wells.