Busy sump pump

I have read other comments about a sump pump that kicks on a lot. My sump pump was installed last year. Before that we had water in our basement only during the wet seasons (New England). Our sump pump has gone on every minute, no kidding, every minute since it was installed in April 2006. Is this normal? The company that installed it says its normal if we are in a high water area. I know that but why is the pump kicking on even when its very very dry outside? We have a well on our property. Is there any way they tapped into that when installing? You can hear water constantly running to the pump.