water - FDA lack of rules

Even when bottled waters are covered by the FDA's rules, they are subject to less rigorous testing and purity standards than those which apply to city tap water (see chart below). For example, bottled water is required to be tested less frequently than city tap water for bacteria and chemical contaminants. In addition, bottled water rules allow for some contamination by E. coli or fecal coliform (which indicate possible contamination with fecal matter), contrary to tap water rules, which prohibit any confirmed contamination with these bacteria. Similarly, there are no requirements for bottled water to be disinfected or tested for parasites such as cryptosporidium or giardia, unlike the rules for big city tap water systems that use surface water sources.