Fluid Categories

Fluid category 

Means a category of fluid described in Schedule 1 of the Water Supply (Water Fittings) Regulations and/or Scottish Water Byelaws.

Interpretation given in Part 1: Preliminary of the Water Supply (Water Fittings) Regulations and Scottish Water Byelaws


Fluid Category 1

Wholesome water supplied by the undertaker and complying with the requirements made under section 67 of the Water industry Act 1991/ the Water Supply (Water Quality) (Scotland) Regulations 1990 and any amendment

Description given in Schedule 1: of the Water Supply (Water Fittings) Regulations and Scottish Water Byelaws 


Fluid Category 2

Water in fluid category 1 whose aesthetic quality is impaired owing to –

a change in its temperature, or

the presence of substances or organisms causing a change in its taste, odour or appearance, including water in hot water distribution systems.

Description given in Schedule 1: of the Water Supply (Water Fittings) Regulations and Scottish Water Byelaws 


Fluid Category 3 

Fluid which represents a slight health hazard because of the concentration of substances of low toxicity, including any fluid which contains – 

ethylene glycol, copper sulphate solution or similar chemical additives, or

sodium hypochlorite (chloros and common disinfectants)

Description given in Schedule 1: of the Water Supply (Water Fittings) Regulations and Scottish Water Byelaws


Fluid category 4 

Fluid which represents a significant health hazard because of the concentration of toxic substances, including any fluid which contains – 

chemical, carcinogenic substances or pesticides (including insecticides an herbicides), or  

Environmental organisms of potential health significance

Description given in Schedule 1: of the Water Supply (Water Fittings) Regulations and Scottish Water Byelaws


Fluid Category 5

Fluid which represents a serious health hazard because of the concentration of pathogenic organisms, radioactive or very toxic substances, including any fluid which contains – 

faecal material or other human waste:

butchery or other animal waste: or

pathogens from any other source.  

Description given in Schedule 1: of the Water Supply (Water Fittings) Regulations and Scottish Water Byelaws