Pump Installation, Pitless Adapters, and Wellhead Completion
This domain tests the finished system: pump selection, drop pipe, pitless adapter, electrical protection, and a wellhead that stays sanitary and freeze-free. Questions often describe a shortcut installation and ask what is wrong.
Pump and pitless adapter
The pump must be sized for the well yield, total dynamic head, and intended use. A check valve keeps water from draining back, and a torque arrestor reduces starting torque on the drop pipe. The pitless adapter carries water through the casing below frost depth and allows the pump to be pulled without excavating. In Iowa, frost depth varies, so the adapter and service line must be below the local frost line and sloped to drain.
Wellhead completion
The casing must terminate above grade, with a secure sanitary cap, a vent that excludes rain and insects, and a conduit for the electrical cable. The ground must slope away. The wellhead must not be buried in a pit, because pits collect water and contaminants.
Worked example
A installer sets a pitless adapter at 4 feet and backfills. In a northern Iowa location with a deeper frost line, the service line may freeze. The adapter should be set below the local frost depth, and the line should drain toward the house or be protected.
Traps
Burying the wellhead; omitting the vent; using an undersized wire; and failing to support the drop pipe so the pump weight hangs on the fittings.