SOUTH East Water has apologised for its second sewer spill into a natural water course on the Mornington Peninsula in four weeks but says it has not found the cause. The first sewer spill into Tanti Creek on 5 May and was followed last Wednesday (5 June) by one that flowed down Balcombe Creek into the estuary at Mount Martha.The water authority has a sewerage treatment plant at the corner of Craigie Road and Moorooduc Highway, Mount Martha. Balcombe Creek runs through that property and the neighbouring, The Briars Park. People and animal owners were advised on Wednesday not to…