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The practice of water treatment soon became mainstream and common, and the virtues of the system were made starkly apparent after the investigations of the physician John Snow during the 1854 Broad Street cholera outbreak. Snow was sceptical of the then-dominant miasma theory that stated that diseases were caused by noxious "bad airs".
Dalecarlia Water Treatment Plant, Washington, D.C. Water treatment is any process that improves the quality of water to make it appropriate for a specific end-use. The end use may be drinking, industrial water supply, irrigation, river flow maintenance, water recreation or many other uses, including being safely returned to the environment.
According to a survey carried out in 2009 by the Spanish consumer organization OCU the water bill was slightly higher than in the ANEAS survey at Euro 227 per year for a water consumption of 175 m 3. However, the survey shows a slightly lower average water and sewer tariff at Euro 1.30/m3.
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Source: WHO/UNICEF Joint Monitoring Program (JMP/2010). Data for water and Sanitation based on the WHO World Health Survey (2003) and the Census (2000).. Among the achievements is a significant increase in access to piped water supply in urban areas (96.4%) as well as in rural areas (69.4%) as of 2018. [8]
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