These waters are officially recognised sources of underground water which have to be naturally free from pollution, harmful micro-organisms and be stable in mineral analysis.
The water may not be treated in any way intended to alter its natural microbiological or chemical composition, therefore what goes in the bottle is exactly what comes out of the ground.
Spring Waters are subjected to most of the same requirements as Natural Mineral Waters except the recognition procedure. They must be from a single named underground source and bottled at source. They may undergo permitted treatments to meet the microbiological criteria.
This water either comes from more than one source or not from an underground source. This may also include Filtered Tap Water and water from the public supply.