A water supply

I am connected to a Museum house in Brighton.They have an Annexe that is the only complete unalterd belowstairs/basement servants quarters of its kind in existence. We uncovered a well that was used to supply the house with fresh water [spring water] .We were removing the top layer of floor screed that was laid over the slabs in an outside yard. It hasnt been tested yet for purity but it seems alright and was clear.The curator of the house does diving so it is going to be explored to see if anything is down there.This means that there is clean spring water right in the centre of town.It might be useful one day. Its about 3 metres deep.