Striving4Zen

America's latest drinking problem isn't about alcohol.

Concerned about the cost of bottled water -- and its environmental consequences -- many people are turning back to tap water to quench their thirst. But as evidence mounts of contaminants in public systems, unease about the water supply is growing.

Engineers say that U.S. water quality is among the world's best and is regulated by some of the most stringent standards. But as detection technology improves, utilities are finding more contaminants in water systems. Earlier this year, media reports of trace amounts of pharmaceuticals in water across the country drew attention from U.S. senators and environmental groups, who are now pushing for regulation of these substances in water systems.

Of particular concern, experts say, are endocrine-disrupting compounds -- found in birth-control pills, mood-stabilizers and other drugs -- which are linked to birth defects in wildlife. Also alarming are antibiotics, which if present in water systems, even in small amounts, could contribute to the rise of drug-resistant strains of bacteria, or so-called super bugs.

The actual health effects of drugs in water systems are unclear. The levels that have been detected are relatively small compared with those of other regulated contaminants, such as mercury and benzene. A 2008 study funded by the Denver-based Awwa Research Foundation -- a nonprofit research group that was established by the American Water Works Association -- concluded that it is "highly unlikely" that pharmaceuticals will pose a threat to human health.

But many medical experts argue that more studies need to be done -- and note that the amount of drugs in the water matters less than who drinks it. Some drugs, even in small amounts, can be especially harmful to infants, pregnant women or those with chronic health conditions, for example.

Drugs are only one category of contaminants found in tap water. A 2005 study released by the nonprofit Environmental Working Group, found that tap water in 42 states is contaminated with more than 140 unregulated chemicals, including MTBE, perchlorate and industrial solvents.

Protesting a Disinfectant

Even chemicals used to clean and disinfect drinking water are causing worry. Citizens' groups in states such as CA, NY and VT are protesting the increasing use of chloramine -- a combination of chlorine and ammonia -- to disinfect drinking water. Utilities are using chloramine because of Environmental Protection Agency limits on chlorine byproducts.

Citizens Concerned About Chloramine in San Francisco, says that hundreds of residents have had reactions, such as rashes and respiratory problems, to the disinfectant. Some byproducts of chloramine can be more toxic than chlorine byproducts, says Michael Plewa, a professor of genetics at the U of Illinois who has studied disinfection byproducts.

The EPA says chloramine is safe in drinking water and has been used for decades.

In the absence of federal regulation of certain chemicals in water systems, some states have stepped in. California, for one, has set standards for various compounds that are not regulated by the EPA, including perchlorate, an ingredient used in rocket fuel that was spilled into groundwater during the Cold War and has been found in many water systems. Massachusetts has set standards for perchlorate and requires that water utilities in the state test for MTBE, a gasoline additive.

Tap Versus Bottled

Health concerns extend to bottled water, says Sarah Janssen, a science fellow at the Natural Resources Defense Council, or NRDC, a nonprofit environmental advocacy group based in NY. "A lot of bottled water is actually tap water, so there is no assurance that what is coming from the bottle is any safer than what is coming from the tap," she says.

In fact, experts say tap water is held to more stringent standards by the EPA, and tested more often, than bottled water, which is regulated by the Food and Drug Administration.

Utilities are required by law to send annual reports to their customers detailing contaminants found in water systems and whether they exceed levels set by the EPA. They're not required to list unregulated contaminants in these reports.

Water that is tested by utilities is generally tested at the plant. It still has to travel through your pipes to get to your tap, so if you have pipes that are a couple of decades old, it may be a good idea to get the water from your tap tested in a lab -- especially if you are pregnant, nursing or have small children, says the NRDC's Dr. Janssen.

Water filters aren't foolproof. Those that are certified by NSF International -- a nonprofit group that tests food and water products -- can get rid of unwanted chemicals to EPA's standards, but consumers should be aware that trace amounts of chemicals may still be left in their water.

Carbon filters, which come in the form of a faucet mount or a pitcher, are the most commonly used and cost about $30, says Rick Andrew, operations manager of the drinking water treatment unit program at NSF. These can be fairly effective in removing many contaminants, but need to be replaced about every two months.

Other options -- such as reverse-osmosis systems, which use a semipermeable membrane to remove contaminants, or ultraviolet light treatment, which prevents micro-organisms from reproducing -- can be more effective, but they cost hundreds or even thousands of dollars. Some consumers have found the cost is worth it, especially if members of the family have certain health conditions.

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Labels: bottled water, drinking, EPA, filters, health and safety, reverse osmosis, tap water, toxic, toxins, water