Depending on how deep it is a drywell can be an EPA regulated thing in the US. This is because it can be a bad idea to sink surface water directly into the aqui

Depending on how deep it is a drywell can be an EPA regulated thing in the US. This is because it can be a bad idea to sink surface water directly into the aquifer - naturally it would be filtered by the overlying soils, if it goes in directly then any surface contamination is washed directly into a reserve of drinking water. But, I'm far from an expert so I can't give any advice as to when one would need registration etc.