- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 14 Dec 2017
Types of water
To help develop this article, click ‘Edit this article’ above.
Approved Document G (Sanitation, hot water safety and water efficiency), 2015 edition, defines a number of classifications of water.
- Domestic hot water: water that has been heated for cooking, food preparation, personal washing or cleaning purposes. The term is used irrespective of the type of building in which the hot water system is installed.
- Greywater: domestic wastewater excluding faecal matter and urine. When appropriately treated this may replace the use of wholesome water in wcs, urinals irrigation or washing machines.
- Harvested rainwater: rainwater harvested from roofs or other suitable surfaces and collected and stored. When appropriately treated this may replace the use of wholesome water in wcs, urinals irrigation or washing machines.
- Heated wholesome water: water that, when cold, was wholesome in accordance with the definition (of wholesome water) and has been subjected to a heat source to increase its temperature.
- Softened wholesome water: water which would be regarded as wholesome for the purposes of the regulations made under Section 67 of the Water Industry Act 1991 (Standards of wholesomeness) as they apply for the purposes of Part G of Schedule 1 in accordance with paragraph (2c) but for the presence of sodium in excess of the level specified in those regulations if it is caused by a water softener or water softening process which reduces the concentration of calcium and magnesium.
- Wholesome water: water complying with the requirements of regulations made under Section 67 (Standards of wholesomeness) of the Water Industry Act 1991. The regulations made under this Section at the time of publication of this Approved Document are; for England, the Private Water Supplies Regulations 2009 (SI 2009/3101), for Wales the Private Water Supplied (Wales) Regulations (SI 2010/66) and for England the Water Supply (Water Quality) Regulations 2000 (SI 2000/3184 as amended), and, for Wales, the Water Supply (Water Quality) Regulations 2001 (SI 2001/3911 as amended).
The document also refers to:
- Heated softened water.
- Reclaimed greywater.
- Reclaimed industrial process water.
- Water abstracted from wells, springs, bore-holes or water courses.
Other definitions of water types might include:
- Black water, brown water, foul water, or sewage: Water that has come into contact with faecal matter or urine.
- White water, potable water, clean water or fresh water: water that is of drinking water quality.
- Non-potable water: water that is not of drinking water quality.
 Related articles on Designing Buildings Wiki
- Approved Document G.
- Approved Document H.
- Earth closet.
- ECA Water Scheme.
- Foul water.
- Groundwater control in urban areas.
- Passive water efficiency measures
- Rainwater harvesting.
- Reservoir construction.
- Sustainable water.
- Water closet.
- Water consumption.
- Water table.
Featured articles and news
Whole-life costs consider all costs associated with the life of a building, from inception to disposal. Find out more here.
Reports emerge of injuries caused by Apple employees colliding with the campus' glazed walls.
The winners of NIC's ideas competition on transforming the Cambridge to Oxford arc discuss their concept.
Create new habitats and improve air quality and wellbeing.
New report provides 12 key actions which could close the structural talent gap in the construction industry.
These can be used to find out whether a proposed development is likely to be approved. Read more here.
Studying a built environment degree? Check out our helpful student resources section.
New BRE research paper explores how blockchain technology can benefit the built environment industry.
Timber is a natural carbon sink, but it must not end up in landfill at the end of its useful life.
BSRIA has collaborated with the Department of Health on research into air permeability in isolation rooms.