A Newshub investigation has found a Chinese company drilled a 170m bore hole on a Christchurch site so it can bottle water for export.

The hole has been drilled despite a warning from the Christchurch City Council that it could interfere with the public water supply.

Officials have concerns the site may be contaminated, and that the new borehole may strike water used by Christchurch people.

The former Kaputone wool scourer in Belfast, which used to clean wool, is now owned by Cloud Ocean water - and it has big plans.

Cloud Ocean Water owned an existing 33-metre-deep bore, but it has drilled a new 170m deep bore which is close to same place the Christchurch City council takes its water from.