Holborn is an area in central London, England. It is also the name of a ward of the London Borough of Camden. The area is roughly defined as the southern half of the land between Tottenham Court Road and the St Pancras and Kings Cross railway lines. It is the administrative centre of the borough. The ward of Holborn has a population of just over 17,000.

0 ppm is the softest water, 400 ppm is the hardest water. The level of calcium carbonate in this water zone is 273 ppm.

The water supplied to Holborn is hard water.

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