The pump house is a wooden-framed structure clad with corrugated iron. Exactly when the original pump house was built is at present unknown. It is likely that it was installed after Williams House was built.
The function of the pump house was to provide water to the house and gardens, to supplement the roof water tank storage system. It was used until the installation of the town water supply and continued to be usable for some time after that. However the quality of the ground water supply today is probably questionable.
In 2015 the Friends of Williams House completed the project to restore the pump to working condition and fully re-built the pump house. We now use the water provided for watering the many gardens on the property.
Inside the pump house is a pump that is driven by an electric motor. The above ground power to the pump house was replaced by underground wiring during the project and the pole now used to support security wiring.