Most water in the United States is used directly or indirectly from the tap. On average, Americans on community water supplies use about 100 gallons of water per person per day. People with private wells use slightly less. According to the American Water Works Association report Residential End Uses of Water (1999) (the latest data available), about sixty-nine gallons per day are used indoors and …
The two primary sources of drinking water are fresh surface water and groundwater. In 2002 more than half (66%) of the population of the United States received water from sources that obtained that water from such surface water as lakes, rivers, and reservoirs. The remaining population (34%) was supplied with water that came from groundwater stored in aquifers. Aquifers are underground geologic fo…
According to the Environmental Protection Agency's (EPA) April 2003 fact sheet Public Drinking Water System Programs, public water supply systems serve 85% to 90% of the U.S. population. The remainder gets its water from private water systems. Urban areas draw their supplies largely from surface water sources, while 90% of the drinking water in rural areas is drawn from groundwater. A publi…
Because of its capacity to dissolve numerous substances, water is regarded as the universal solvent. Pure water rarely occurs in nature, as water dissolves minerals and other natural substances. At low levels, dissolved contaminants generally are not harmful in drinking water. Removing all contaminants would be extremely expensive and might not provide greater protection of health. The amount of h…
The most significant water treatment event in the United States was the introduction of the use of chlorine as a disinfectant in water supplies. The introduction of chlorine in water supplies began in the early 1900s. As towns and cities began to introduce this practice, epidemics and incidence of typhoid, cholera, and dysentery were dramatically reduced. From this humble beginning evolved the com…
Federal regulation of drinking water quality began in 1914, when the U.S. Public Health Service established standards for the bacteriological quality of drinking water. The standards applied only to systems that supplied water to interstate carriers such as trains, ships, and buses. The Public Health Service revised these standards in 1925, 1942, and 1962. The 1962 standards, which regulated twent…
The EPA is continuing its work to protect drinking water from unsafe contaminant levels, to oversee the activities of the states that enforce federal or their own stricter standards, and to solicit public input as it develops new standards or other program requirements. The SDWA has been amended to require the EPA to: These amendments have resulted in the following major programs within the SDWA, …
The Water Efficiency Act of 1992 established uniform national standards for manufacture of water-efficient plumbing fixtures, such as low-flow toilets and showers. The purpose was to promote water conservation by residential and commercial users. Preliminary results from studies by the American Water Works Association and the EPA indicated that, by 2020, water consumption could be reduced by 3% to…
Supplying the public with safe drinking water is an expensive proposition. From 1976 to 1998 (the latest data available), the number of contaminants regulated under the SDWA roughly quadrupled (see Figure 5.4), and new treatment technologies have been required. This has significantly increased the cost of water treatment in many locations. More than ninety contaminants are now regulated. Public wa…
Safe drinking water is a cornerstone of public health. Drinking water in the United States is generally safe. The vast majority of U.S. residents receive water from systems that have no reported violations of MCLs or flaws in treatment techniques, monitoring, or reporting. However, in the 3,500-page report Victorian Water Treatment Enters the 21st Century (Natural Resources Defense Council, 1994),…
A 2002 Gallup Poll asked people if they believed drinking water from the tap was safe. The results were published in August 2003: 71% of respondents were confident or very confident about the quality and safety of their water. This figure was slightly higher than the 68% who said they believed their water was safe in a similar poll conducted in 1998. FIGURE 5.5 Types of drinking water systems…
Water is called "bottled water" only if it meets federal and state standards, is sealed in a sanitary container, and is sold for human consumption. The members of the International Bottled Water Association (IBWA) produce and distribute 85% of the bottled water sold in the United States. According to the Beverage Marketing Corporation in its "2004 Stats" (http://www.bot…
Because good sources of drinking water are a limited resource, the cost of developing and treating new sources is expected to rise. In addition, existing water suppliers are faced with the need to provide water to expanding service areas. As a result, the water industry is looking for cost-effective alternatives and is evaluating water conservation and reuse practices, as well as removing salt fro…
Tremendous progress has been made in the years since the adoption of the SDWA in the treatment, protection, and provision of safe drinking water. This feat was accomplished primarily because of the efforts of professionals in the drinking water and health industries in the public and private sectors. Public health protection has been, and remains, the focus for providing safe drinking water. Never…
Water quality varies greatly in developing nations, as poverty often results in inadequate distribution of resources, including food and water, and sanitation practices are generally poor. Nevertheless, the quality of water in some developing countries is showing improvement. WHO estimated that in 2000 water supply availability ranged from 62% in Africa to 100% in North America. The percentage of …
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