On Oct 17, 9:07 am, " wrote:
plastic would appear a better cheaper option, there was a tv show
dream house? a new home built in denver on the side of a hill, with no
water service they had a room for a plastic water tank with regular
deliveries.

plastic never rusts leaks etc plus must be cheaper


I know some people are under the impression that plastic lasts
forever... but it gets brittle and eventually cracks. I was removing
a sink today to install granite counter tops and the brittle plastic
piece which connects to the stainless steel broke off on me instead of
unscrewing. I stored a lot of old mail rubber-banded by date and when
I went to go through it years later to throw 99% of it out all the
rubber-bands had broken by themselves. The rubber hoses in your car
eventually leak. Ultraviolet also causes many plastics to fall
apart. Many plastics are even slowly eaten by microbes. While
plastic is a miracle of "modern science" and the best choice for many
many applications it is normally not a good idea to count on it
lasting longer than concrete, stone, or metal which was properly
designed and maintained. I do not know if it is the right choice for
the OP's application, perhaps it is. It is probably the cheapest.

Picture of "attractive" concrete tank:
http://www.oasisdesign.net/images/im...38rockTank.jpg