In October 2005, the British Food Standards Agency issued warnings against "fraudulent" Zamzam water being commercially sold which contained dangerous levels of arsenic (over three times the legal limit recommended by the World Health Organization).
A brand of Zam Zam formally sampled by the London Borough of Westminster has been found to contain almost three times the permitted level of arsenic, which could contribute to increasing people's risk of cancer.
However, in May 2011, a BBC investigation found that, like the "fraudulent" Zamzam water being sold in 2005, genuine Zamzam water taken from the well also contained arsenic levels three times the legal limit.
In addition to the dangerous arsenic levels, the holy water contained high levels of nitrate and potentially harmful bacteria. [Samples from taps which were linked to the Zam Zam well and bottles on sale in Mecca] showed high levels of nitrate and potentially harmful bacteria, and traces of arsenic at three times the permitted maximum level, just like the illegal water which was purchased in the UK.
Question: Is this true?
Does it mean that we can't have Zamzam water because it will harm us and the Prophet forbade doing actions that would harm ourselves?