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Under a grant from the U.S. Environmental Protection Agency (EPA), NSF International completed tests that verify the claims of three residential point-of-use water treatment systems. Point-of-use systems are designed to treat drinking water coming from a single dispensing point, such as a kitchen faucet, and usually treat only the cold water supply. The test results indicated that these residential drinking water treatment systems could reduce waterborne bacteria and viruses in the event of intentional contamination within a municipal or private water supply during a homeland security incident.

Testing was conducted in conjunction with the EPA National Homeland Security Research Center and Environmental Technology Verification (ETV) Program. The three water treatment devices tested reduced biological agent surrogates that represented possible biological contaminants. The surrogates were selected by experts from government agencies and academia working on water security. The units were tested using five different microorganisms, and the ability of the devices to reduce the concentration of each was measured and verified.

All three products tested are reverse osmosis systems, comprised of a membrane separation technology, that removes the biological surrogate microorganisms. Further information about these products, including test results, is available on the ETV website. information from Nsf website.

Radium occurs in ground water due to the radioactive decay of Uranium in geologic formation. Also, Radon gas can dissolve and accumulate in underground water sources, such as wells, and in the air in your home. There is a health risk if the Radium level exceeds 20 pecocuries per liter (pCi/L). Some people who drink water containing Radium 226 or 228 in excess of EPA’s standard over many years may have an increased risk of getting cancer.

TDS is the sum of the mineral salts in water and if too high can result in objectionable taste, cloudy ice, interference with the flavor of foods and beverages and scale left behind in cookware. Generally speaking, the lower the TDS the more acceptable the drinking water. TDS of 1,000 ppm or more is unacceptable for drinking water.

Nitrates are inorganic chemicals dissolved in some water supplies as a result of feedlot and agricultural activities. Nitrate levels over 45 mg/L as actual NO3 (or 10 mg/L as Nitrogen, N) can be a serious health risk to infants and children.

Water which contains excess acidity tends to act aggressively towards plumbing and fixtures, causing corrosion and staining (i.e.-blue green stains on fixtures from copper pipes or pin hole leaks). Relative acidity/alkalinity is measured on the pH scale, ranging from 0- 14, where 7 is neutral, numbers lower than 7 are progressively more acidic, and numbers higher than seven are increasingly alkaline (basic). The pH value refers not to the quantity of acidity, but rather to the relative acidity/alkalinity of a particular sample.

Compare Arizona’s water here:  Arizona clean water act.