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Announcements: Ground Water Awareness Week — March 11–17, 2012

CDC is collaborating with the National Ground Water Association to highlight National Ground Water Awareness Week, March 11–17, 2012. Water is essential for life. However, many persons are not aware that much of the water they use flows from below ground to the surface, where it is used by public water systems and private wells. The National Ground Water Association uses this week to stress ground water's importance to the health and well-being of humans and the environment (1).

The majority of public water systems in the United States use ground water as their primary source, providing drinking water to almost 90 million persons (2). An additional 15 million U.S. homes use private wells, which also rely on ground water (3).

Usually, ground water in the United States is safe to use. However, ground water sources can be contaminated naturally or as a result of imperfect agricultural, manufacturing, or sanitary practices. The presence of contaminants such as pesticides, factory waste, and sewage can lead to acute and chronic illness (4).

The U.S. Environmental Protection Agency has worked with individual states to develop new regulations to provide increased protection against microbial pathogens in public water systems that use ground water sources (5). Private ground water wells (serving fewer than 25 persons) might not be regulated but nonetheless must be properly maintained by well owners to ensure that the water remains free from harmful chemicals and pathogens.* Resources are available from state and local health departments to help homeowners protect their ground water.


  1. National Ground Water Association. National Ground Water Awareness Week: March 11–17, 2012. Westerville, OH: National Ground Water Association; 2012. Available at Accessed March 7, 2012.
  2. US Environmental Protection Agency. Factoids: drinking water and ground water statistics for 2009. Washington, DC: US Environmental Protection Agency, Office of Water; 2009. Available at Accessed March 7, 2012.
  3. US Census Bureau. Current housing reports: American housing survey for the United States: 2009. Washington, DC: US Government Printing Office; 2011. Available at Accessed March 7, 2012.
  4. US Environmental Protection Agency. Drinking water contaminants. Washington, DC: US Environmental Protection Agency; 2012. Available at Accessed March 7, 2012.
  5. US Environmental Protection Agency. Ground water rule (GWR). Washington, DC: US Environmental Protection Agency; 2012. Available at Accessed March 7, 2012.

* Additional information available at

Additional information available at

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