WATER SUPPLY
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The statutory requirement for a dwelling house is the 'it has an adequate piped supply of wholesome water' (Housing Act - 1985)
It should be connected to either a mains or private supply that it wholesome, has normally a continuous rate of supply and has piping designed, installed and in a condition so as not to contaminate the supply. There should also be an outlet conveniently located above the kitchen sink.
Drinking water should normally come direct from the rising main to reduce the health risks.
Under working conditions, the drinking water supply should have a sufficiently continuous and adequate flow to safely replenish water tanks, boilers and hot water cylinders to prevent hazards resulting from overheating.
Whilst one tap may be adequate, a polluted supply would, and an intermittent supply could alone be a sufficiently serious defect to render the house unfit.