Discharges from cess pits or septic tanks are another likely source of contamination. All those who drink contaminated water are at risk of infection. However, the risk for those who do not drink the water regularly and are not used to it, such as visitors and guests, is likely to be greater. It may be advisable for them to use boiled or bottled water for drinking. Nitrate is only a problem in some parts of England and Wales.
Water containing high levels of nitrate is particularly unsuitable for bottle-fed babies.
These may affect the appearance, taste or smell of the water. On the whole, these are not dangerous to health. If you are not sure whether your water is affected, ask your local council for advice about the level of nitrate or other chemicals in your water supply. Lead Lead can be particularly harmful to very young children. Many private water supplies in England and Wales are naturally acidic and may dissolve lead.