Enjoy your borehole water then
Water sinks in to soil no matter what you do...a borehole taps in to underground streams and where do you think that water comes from?
Where does my Borehole Water come from?
Water from rain and rivers seeps through layers of rock to underground areas. Water impermeable layers of rock or clay can separate and/or confine underground water bodies at different depths and in different areas. These are called aquifers.
It does seem however its safe to drink but I'll still give it a miss...saying so from experience

People like Nestle etc. get their water from underground of course...but I think its in remote areas free from pollution like our boreholes are subjected to.
Is borehole water safe to drink?
The short answer is YES in most cases. All spring and most bottled water that you buy is water that comes from the ground …valpre and nestle both pump water from boreholes drilled by EDRS.
If you are going to drink the water (64% of all South African’s survive on groundwater!) then it is a good idea to have it analysed at a water lab just to make sure its fit to drink. A simple SANS-241 test will confirm if it is potable or not. Thankfully most of Gauteng's groundwater is fit for human consumption.
Anyway, each to their own - just shared for the OP to take in to consideration.