Where necessary water companies have been taking action to control nitrate levels in drinking water. This is something which people complain about frequently because iron can discolour water. It comes from rusty water mains. Even if water looks a very reddish brown colour it is unlikely to harm your health. The position should improve further.
Water companies have major programmes in hand to replace or reline corroded mains.
These improvement programmes will take a further 11 years to complete. The worst affected areas are being dealt with first. Cryptosporidium is a small organism found in man and many other animals. It can cause a disease called cryptosporidiosis. In infected animals it multiplies in the gut, forming tiny spores called oocysts, which are excreted in faeces in very large numbers.