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# Wastewater that usually includes excreta and that is, will be, or has been carried in a sewer (WHO 1992).<br />
# Mixture of human excreta and water used to flush the excreta from the toilet and through the pipes; may also contain water used for domestic purposes (WHO 2006).<br />
# See also: [[wastewater]] or [[black water]]<br />
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==Explanation==<br />
“Sewage” (or black water), includes sullage and human excreta from waterborne facilities.<br />
Sewage is called “sludge” when it becomes a thick mud. This water includes bacteria and<br />
other disease-causing organisms that make the water unsafe for untreated use in capacities<br />
that would create direct human exposure (WHO 2003).<br />
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==Example==<br />
Sewage or wastewater includes domestic wastewater (black water and greywater) as well<br />
as commercial and industrial wastes, as well as surface runoff (in the case of combined<br />
storm and sanitary sewers) that may be discharged to dewage systems.<br />
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==References==<br />
* WHO (1992) [http://www.who.int/water_sanitation_health/hygiene/envsan/onsitesan/en/ A guide to the development of on-site sanitation.]<br />
* WHO (2003) [http://www.who.int/water_sanitation_health/hygiene/om/en/wsh9241562153.pdf Linking Technology Choice with Operation and Maintenance in the Context of Community Water Supply and Sanitation: A Reference Document for Planners and Project Staff]<br />
* WHO (2006). [http://www.who.int/water_sanitation_health/wastewater/gsuweg1/en/index.html Guidelines for the safe use of wastewater, excreta and greywater: Volume 1 Policy and regulatory aspects]<br />
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==Links==<br />
* [http://apps.who.int/thelexicon/ WHO — The Health and Environment Lexicon]<br />
* [http://www.emro.who.int/ceha/clearingh_waterdemand/portals/waste/index.asp WHO Wastewater Management for Small Communities]<br />
* IRC, WHO (2000) [http://www.who.int/water_sanitation_health/hygiene/om/omruralsystems/en/index.html Operation and maintenance of rural water supply and sanitation systems: A training package for managers and planners]<br />
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