If there is scientific evidence that plastic (polyethylene) may in fact contaminate the water, why is there no legislation to prohibit sale of polyethylene tank?
Governments are notoriously slow to respond (exceptions to the rule: the Canadian government which banned the sale of plastic baby bottles days after a relevant study proved that bisphenol leaches into the formula). The main reason can be found in the lobbying power of some very influential industries. The best example is cigarettes, the link between smoking and rather serious and terminal diseases has been established decades ago, but tobacco is still for sale. On the other hand, customers are free to make an informed decision.
