Aquarion Water Co. will make a public presentation on its South Shore water system at 7 p.m. Wednesday in the Sanborn Auditorium at Hingham Town Hall. The town of Hingham is looking into buying the system, which serves Hingham, Hull, and parts of Cohasset. According to Aquarion officials, the public meeting is mainly to discuss what the implications of this move may be and a possible purchase price. Aquarion will also host a tour of its water-treatment plant, located on 900 Main St. in Hingham, on the same day at 1 p.m. For more information, contact Ronit Goldstein at 781-740-6693.