Groundwater

You can view a national map of hardness in surface water at water hardness map. Hardness data (reflecting mostly calcium, plus a little magnesium) for individual drinking-water suppliers can be found at this link EPA Office of Ground Water and Drinking...
Regulatory limits for safe levels of elements in water and foodstuffs are established by the U.S. Environmental Protection Agency and the U. S. Food and Drug Administration. However, there are generally no regulatory limits that scientists can refer to...
Safe water means water that will not harm you if you come in contact with it. The most common use of this term applies to drinking water, but it could also apply to water for swimming or other uses. To be safe, the water must have sufficiently low...
There are many different kinds of treatments depending on what contaminant is in the water. Biological contamination is usually treated by heat (boiling) or by filtration. Inorganic contaminants dissolved in the water can be removed by distillation or...
A basic introduction to natural filtering of water can be found on-line at the USGS 'Water Science for Schools' website. The address for the site's ground-water-quality page is:Groundwater QualityNatural filtering is a big topic. Some filtering takes...
Since 1950, the U.S. Geological Survey (USGS) has collected and analyzed water-use data for the United States and Territories. The is the main webpage for the USGS Water Use Program. This page is the access point to the water-use data that is assessed...
Sulfur is not regulated as a primary drinking-water contaminant, so there is no official level of sulfur that represents a threshold between healthy and unhealthy concentrations. Sulfur is required by all living things as part of their normal metabolism...
Yes, it is called reclaimed wastewater, though its use is limited. Before you start to feel ill, no, it is not used further down the line as drinking water. It is most often used for irrigation and for water parks and golf courses. In the U.S. in 1995...
Yes. The main body of subsurface water is found in the saturated zone of aquifers. Aquifers can be only a few feet below the surface or more than a thousand feet deep. Aquifers are the primary source of drinking water in arid and semi-arid parts of the...
There is great concern that the dead marsh areas could be seriously affected by major storm events. Local, state, and federal agencies are working together to determine what, if any, short-term measures can be implemented, and to put in place long-term...