Is groundwater a renewable resource

Yes . . . with conditions. It depends on whether the ground water is a 'spring' in nature or an aquifer. If a spring it is part of the hydrological cycle (rain falling on hills, seeping through the ground, creating creeks, rivers, and ending up in the ocean to be evaporated into clouds to cause rain on the hills etc). Aquifers can take millennium to 'recharge' so therefore can be called 'renewable' although that would be stretching the terminology.