Schedule 1 of the water fittings regulations in England, Wales and Northern Ireland, byelaws in Scotland, classify the health risk posed by potential contaminants using a scale called fluid categories.
There are five fluid categories in total the lowest being 1 no risk the highest 5 a serious health hazard.
Fluid Category | Description | Example |
1
|
Wholesome (drinking) water supplied by the undertaker
|
water direct from a water undertaker’s main
|
2
|
Wholesome (drinking) water which has been changed either heated or altered in taste, odour or appearance
|
Hot water
|
3
|
Fluids posing a slight health hazard
|
low toxicity chemicals such as common disinfectants
|
4
|
Fluids posing a significant health hazard.
|
Toxic substances such as pesticides and environmental organisms
|
5
|
Fluids posing a serious health hazard
|
Pathogenic organisms, radioactive or very toxic substances such as faecal matter
|
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