During February 2012, the Cambridge Archaeological Unit (CAU) monitored the groundworks associated with the construction of four offtakes along the pre-existing Grafham to Hannington water main within Northamptonshire. The work involved stripping an area of topsoil and the excavation of small trial pits to access the existing water main. The trial pits were located along previously disturbed ground associated with the original insertion of the water main and thus did not require monitoring. Offtake 7 yielded evidence of post-Medieval activity, but no other archaeological remains were encountered.