In my house, we drink underground water from our well. It is 40 meters deep. The question is, how old is the water that we drink today? Is it from the rain 100 years ago?

Another issue is, today much pesticide is used. Someday they will diffuse down to the underground 40 meter. How long will it take?

In my house, we drink the groundwater that we get from our well. It is 40 meters deep. The question is, how old is the water that we drink today? Is it from the rain 100 years ago?

Another issue is, today much pesticide is used. Someday they will diffuse down to the underground 40 meter. How long will it take?

In my house, we drink underground water from our well. It is 40 meter deep. The question is, how old is the water that we drink today? It is from the rain 100 years ago?

Another issue is, today much pesticide is used. Someday they will diffuse down to the underground 40 meter. How long will it take?

In my house, we drink underground water from our well. It is 40 meters deep. The question is, how old is the water that we drink today? Is it from the rain 100 years ago?

Another issue is, today much pesticide is used. Someday they will diffuse down to the underground 40 meter. How long will it take?