I would at least think the titanium could be placed for the long underground water-ways. This could be solved with having a steel end and outter wall, but a titanium inner coated shaft. (for the pipes that go from main supply to house) This would majorly reduce the intake of corroded metals into drinking water. I live in a house that was built in 1967 and already the water tastes of metal. Once we went on vacation and returned after about 2 weeks of no use and the water was rust colored until after a good rushing out period.