Typical well depths

There is no meaningful national average for residential wells. Some homes have 2 inch driven point wells, some have 5 or 6 inch casing, and depth depends on the geology and water under your parcel. A 6 inch drilled well can be shallow in productive sand and gravel, while bedrock wells run several hundred to a thousand feet. Use these ranges only to sanity-check, never to size a dose.

Well type	Typical total depth	Basis
Shallow sand/gravel or driven point	25-75 ft	Assumed
Common residential drilled well	150-350 ft	Assumed
Fractured bedrock / variable yield	300-600 ft	Assumed
Difficult geology or poor aquifer	600-1,000+ ft	Assumed

Get your actual record instead

Nearly every state requires drillers to file a construction report, usually kept by the geological survey or the natural resources department. Many states are searchable right on the calculator page. Every state's records agency:

If your state is not listed, search for your state name plus "well construction report". The records office can usually pull your log from the address or the parcel number.