Work for the construction of a supermarket on the outskirts of Aqui Terme brought to light a substantial stratigraphy of Pleistocenic fluvial deposits, with pluvio-colluvial layers that are the result of the detritions and alteration of the lithoid series of the hill overlooking the river Bormida. Below a surface layer, 0.60 m deep made up of sand and modern detritus, was an alluvial layer formed during the periodical flooding from the Bormida in the historical era, as attested by the pottery finds. The excavation of layer US 104 (silt mixed with occasional cobbles) revealed a 14 m long water pipe formed by 52 terracotta truncated cone shaped _tubuli_ (each 10 cm long and 8-10 cm in diameter) placed so that their wider end was against the water flow. The pipe was orientated towards the south-eastern area of the Roman town and, therefore, may have been part of the water supply system, perhaps serving buildings on the edge of the urban area.