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.
- Earth closet.
- ECA Water Scheme.
- Groundwater control in urban areas.
- Marine energy and hydropower.
- Natural gas.
- Passive water efficiency measures
- Rainwater harvesting.
- Reservoir construction.
- Sustainable water.
- Water closet.
- Water consumption.
Featured articles and news
The origins, evolution and future of Level 3 BIM.
For new and returning Urban Design students, check out our article list divided up into the modules you'll be studying.
Report states that health of urban dwellers could be significantly improved by rethinking transport design.
The Kremlin, the centre of Russian power, includes some of the country's finest architecture.
Report launched outlining steps for a national infrastructure system that is efficient, sustainable, and delivers until 2050.
A review of Justin Bere's concise and well-presented introductory guide to Passive House.
This article describes in detail the tender process for a typical commercial construction contract.
What is energy storage, what are the different types and what is its future?
MAD Architects reveal their designs for a state-of-the-art concert hall in Beijing.
Take a look at BIG's designs for two twisting towers in New York City.
'The filing cabinet' which was labelled one of the best British buildings of the 21st century.