About 11 years ago, we moved into a new house in rural Waikato (NZ). It was our first time on Rainwater (5000 gallon tank), and it was a dry summer. We were running out of water. The neighbours behind us had a bore, and offered to let us refill the tank, which we accepted.
You see, the Waikato is rich peaty river plain, really porous. Rainwater runs straight down through the soil and the fecal matter of thousands of cows, then hits the volcanic ash beds and starts flowing, fast. Also, there was no local sewage system, so every man and his dog has a septic tank, which gets flushed through by washing machines and dishwashers and goodness knows what. The local bores were all really shallow, and fed by this surface water, not deep aquifers.
Point is, the water was contaminated - didn’t make WHO standards (I had it tested by a microbiologist at work, and the explanation was provided by an environmental scientist). We were all sick for days, and had to add purification stuff and boil our drinking water.
You don’t want a quick replenish of your aquifer - lots of really slow filtration is the best.