- Project plans
- Project activities
- Legislation and standards
- Industry context
Last edited 15 Apr 2018
Types of water
To help develop this article, click ‘Edit this article’ above.
- 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.
- ECA Water Scheme.
- Foul water.
- Groundwater control in urban areas.
- Passive water efficiency measures
- Rainwater harvesting.
- Reservoir construction.
- Sustainable water.
- Urban water systems management: A data analytics approach EP 105.
- Water consumption.
- Water table.
Featured articles and news
Which room is the most fun to design? Find out the 'Grand Designs' presenter's unusual choice in our interview.
Full suite of speakers are announced for this year's BSRIA Briefing event.
Book your place for the Architectural Technology Awards 2018.
There are many ways of classifying types of building. Have a look at our range of building articles.
BSRIA have launched the 'major update' of the go-to design framework guide for building services.
How to get results with building life cycle assessment.
Government publishes a prospectus inviting proposals for new 'garden communities'.
The Morandi motorway bridge in Genoa collapses during rainstorm while undergoing maintenance works.
'Developed design' is a phrase coined by the RIBA for their 2013 Plan of Work. But what does it actually mean?
New green paper published aiming to rebalance the relationship between landlords and residents and tackle stigma.
RIBA calls for a comprehensive ban on combustible materials.