In those loca­tions where a pub­lic water sup­ply is rea­son­ably avail­able, the sup­ply shall be the sole source of water for drink­ing and culi­nary pur­pos­es.  A pub­lic water sup­ply shall be deemed rea­son­ably avail­able when the sub­ject prop­er­ty is locat­ed with­in two hun­dred (200) feet of the pub­lic water sup­ply to which con­nec­tion is prac­ti­cal and is per­mit­ted by the con­trol­ling author­i­ty for said water supply.