water quality

To most people not professionally involved in water quality issues, water is either drinkable (technically ''potable'') or contains potentially harmful or toxic substances. However, the vast majority of surface water on the planet is neither potable nor toxic. This remains true even if we eliminate from consideration the more than 97% of the earth's water found in the oceans (sea water)—too salty to drink. Another general perception of ''water quality'' is that of a simple property that tells whether water is pollutionpolluted or not. In fact, water quality is a very complex subject, in part because water is a complex medium intrinsically tied to the ecology of the entire Earthplanet.Interest by individuals and volunteer groups in making local water quality observations is high, and an understanding of the basic chemistry of many water quality parameters is an essential first step to making good measurements. Most citizens harbor great concern over the purity of their drinking water, but there is far more to water quality than water treatment for human consumption. In point of fact, water purificationpurification of drinking water is really a different, although obviously related, subject altogether. Many people in the world live where community water purification is simply not a reality. For these people, water quality, even for drinking purposes, relates directly to the local stream, lake, or aquifergroundwater. Thus, at its heart, water quality is about preserving uses. Not only use of water as a consumable product, but all other uses such as wildlife Habitat (ecology)habitat, irrigation, swimming, fishing, rafting, and boating—any or all of which can be adversely impacted by water quality degradation. Of course, industrial uses are also important, and industryindustries are always interested in the quality and quantity of water available to them.Statements to the effect that "uses must be preserved" are included within water quality regulations because they provide for broad interpretation of water quality results, while preserving the ultimate goal of the regulations. Technical measures of water quality—that is, the values obtained when making water quality measurements—are always subject to interpretation from multiple perspectives. Is it reasonable to expect a river to be pristine in a landscape that no longer is? If a river has always carried sediment, is it polluted even if the cause is not man induced? Can water quality be maintained when water quantity can not? The questions that arise from consideration of water quality relative to human uses of the water become more complex when consideration must be given to conditions required to sustain aquatic biota. Yet inherent in the concept of preserving uses is a mandate that waterways must be much more than conduits for a fluid we might want to drink, fill our swimming pool with, or carry our wastes out of town.

Measurement of water quality - The complexity of water quality as a subject is reflected in the many types of measurements of water quality. These measurements include (from simple and basic to more complex):

Electrical conductivityConductivity (also see salinity)

Dissolved OxygenDissolved Oxygen (DO)

pH

Color of water

Taste and odour

Turbidity

Total suspended solids (TSS)

Chemical oxygen demand (COD)

Biochemical oxygen demand (BOD)

Fecal coliform bacteria (e.g. ''Escherichia coli'')

Nutrients#Nutrients and the environmentNutrients (fertilizers)

Dissolved metals

Dissolved organicsThe simple measurements (towards the top in the listing above) are those that can be made with an instrument, in most cases in the field (''in situ''). The more complex or difficult measurements are those that come from analytical methods, typically requiring a water sample to be collected, preserved, and later analyzed in a laboratory setting. These latter measurements can be expensive and it is always important to understand in advance the reason(s) for making any particular measurement. Also, because the number of substances that could be present in a water sample runs to the millions, it is not possible to reasonably establish what all might be in a particular sample without a very large budget. If the logic of this fact is difficult to grasp, the inefficiency should be obvious: to satisfy such a request, a laboratory would have to charge for determining the more that 99% of possibilities that are NOT present in the sample to discover the minutely less than 1% that are.One effective way to improve water quality in a farm pond is to get more oxygen in the water. AERATION is often done by sending compressed air to an air diffuser at the bottom of the pond. The deep water rises to the surface and the water molecules grab oxygen from the atmosphere. As the pond water circulates, soon the oxygen levels in the water from top to bottom increase. Thus, aeration adds oxygen to the water and improves water quality.

See also -

Water#Body of waterVolumes of water on earth

Water resources

Clean Water America
Clean Water America is a not-for-profit advocacy network dedicated to bringing organizations and individuals together to protect and improve the quality of water in America. Our mission is to clean up waterways for swimming, fishing, and boating and to guarantee that our drinking water is healthy for our families and future generations. We will accomplish this mission by working with elected officials across the country to gain their support for a long-term, sustainable solution to ensure clean and safe water in America. Your involvement in Clean Water America will help guarantee that every American can enjoy the nation's rivers, lakes, streams and bays and safe drinking water.
http://www.cleanwateramerica.org/

The Limberlost, Gene Stratton-Porter's first married home
Geneva, Indiana ecology pioneer, female crusading photographer, author of enduring books, cinema pioneer, role model.
http://www.genestrattonporter.net/

DIE-Wasser - mit aktiviertem Wasser leben und sich wohlfühlen!
Der GIE-Wasseraktivator ist konzipiert, um den Menschen ein belastungsfreies Wasser im Sinne der Homöopathie zu ermöglichen. In Anlehnung an die Homöopathie und die ihrem Verständnis zugrunde liegenden Erkenntnís, dass Wasser ein Gedächtnis hat, lösc
http://www.giewasser.com

Citizens for a Better South Florida
Citizens for a Better South Florida is a non-profit community-based environmental education organization. Our mission is to improve our quality of life through instilling environmental awareness within South Florida’s diverse multi-lingual communities. Over the past fifteen years, Citizens has designed experiential, multi-lingual education and outreach programs for students, teachers and community organizations, including activities such as community festivals, environmental field trips, curriculum development and trainings, tree plantings, workshops, in-class visits, and habitat restorations.
http://www.abettersouthflorida.org/

Biofilters for Aquaculture and Public Aquariums
For the aquaculture industry and public aquariums, L. S. Enterprises provides design services and components for various types of biofilters, CO2 scrubbers and solids removal systems. In addition, L. S. Enterprises provides thermal sizings and sells components for direct contact heat and mass transfer devices such as water cooling towers, evaporative coolers, air pollution control scrubbers and other similar equipment.
http://www.biofilters.com/

VUEWorks
Developers of gis based infrastructure asset managment software
http://www.vueworks.com/

Water Quality Association
Water Quality Association (WQA) is the international trade association representing the household, commercial, and industrial water quality improvement industry.
http://www.wqa.org/

National Agricultural Library
Research affiliation: Association of Research Libraries.
http://www.nal.usda.gov/

USGS -- Water Resources of the United States
Home page for water resources information from the U.S. Geological Survey. Topics include ground water, surface water, water use, water quality, acid rain, toxic substances hydrology.
http://water.usgs.gov/