Your tap water smells like rotten eggs and tastes a little funny. Is it unhealthy? Probably not. You can't really tell about the quality of your drinking water at home from its look, smell or even taste.
That rotten smell coming from your tap water, for instance, can come from hydrogen sulfide, which is harmless. Algae also produce offensive odors and taste, yet it too is benign. Same for iron, rust or leaf residues, which can turn drinking water reddish brown, or excess manganese, which makes drinking water look black.
It's the silent contaminants in home drinking water, the ones that don't trigger your senses, that you need to worry about. Lead from pipes in old houses, arsenic that naturally occurs in the earth, or microorganisms, pesticides and fertilizers that wash away from farms and lawns into storm drains and wind up in our drinking water supplies are all silent contaminants that can be lurking in your water. All of these have been linked to serious illnesses.
Experts agree that the U.S. has one of the safest drinking waters supplies in the world, but that is no guarantee that your water doesn't have any silent contaminants. Recent headlines about arsenic in the Midwest and New England water, and the chromium 6 chemical contaminations uncovered in California by the tenacious Erin Brockovich underline the need to be cautious about drinking water.
Test First. If you can't see, smell or taste a water problem, how do you detect these dangerous contaminants? Well, if you're like thousands of Americans, you might purchase a water purifier and assume everything is safe, a big mistake according to the Consumers Union (CU) and Environmental Protection Agency (EPA).
You wouldn't use eardrops to treat pink eye, or antacid for a headache. Likewise, you shouldn't use a filter, distiller or other device to treat your drinking water until you know if and why it needs to be treated. Highly popular charcoal filters don't remove lead or microorganisms from drinking water, though they do filter chlorine and pesticides. Distillers, on the other hand, remove lead from drinking water, but not volatile organic chemicals, like benzene. So it is important to have your drinking water diagnosed before treating it.
First, get some information on your drinking water. The EPA set standards for 80 contaminants, and since 1999 has required all public water suppliers to send consumer confidence reports to their customers with results of testing for these standards. If you haven't gotten a report, contact your water provider. Remember, though, this report covers the water's quality when it left the company, which may change by the time the water runs out your faucet. Well users should call your health department and ask about any past, existing or potential groundwater problems in your area.
Next comes testing. You should periodically test your water through an independent, certified lab. Labs offer a variety of testing packages (lead, minerals, volatile organic chemicals, radon, bacteria, pesticides) at a range of prices ($30-$250). There are also home drinking water test kits for various contaminants. To find a lab to check your drinking water, check your local yellow pages, get suggestions from your health department, call EPA's Drinking Water Hotline (1-800-426-4791), or visit www.epa.gov/safewater/ .
The Right Fix. After you know what, if any, contamination exists in your drinking water, you can buy a water treatment unit that will take care of your problem. There are several different kinds of water treatment devices with about 400 manufacturers. Don't be swayed solely by a "registered by the EPA" label; it only means the water purifier was tested to make sure it doesn't cause contamination, it doesn't mean the water treatment unit works well.
Water experts suggest buying from a reputable dealer and looking for a seal of approval by the independent evaluation organization, the National Sanitation Foundation (NSF) International. Also, remember that even the best water purifiers don't do their job if they are not maintained properly.
For additional info on water standards, testing and treatment, visit www.epa.gov/safewater/ , www.nsf.org  or call the EPA's Safe Drinking Water hotline (1-800-426-4791.) The Water Quality Association (www.wqa.org ) offers specific tips on troubleshooting drinking water problems in your home.
Is Bottled Better? There's mineral, sparkling, seltzer, artesian, distilled, club, and purified water. Hundreds of brands of bottled water are swelling the billion-dollar industry. Are these bottled water brands worth the price?
It depends. If taste is your criteria for a good bottle of water, the Consumers Union, home of Consumers Reports, found that many bottled waters do taste good. Whether you like the earthy flavor of mineral water or the bubbling sensation of sparkling aqua, you're likely to find a bottled water product you prefer over your tap water.
However, many a bottled water is tap water. In fact, when the US House Energy and Commerce Committee investigated the trendy bottled water market in the 1990s, it found a quarter of the water products came from the same source as tap water. Although bottlers take steps to remove pollutants, contaminants from the water supply can crop up in the bottled waters.
Even artesian or other naturally occurring waters can contain higher than desired levels of contaminants, like arsenic, a poison that's been in the news lately because of a push to reduce current water standards (50 parts per billion) to as low as 5 parts per billion. Linked to cancer and other life threatening diseases, arsenic occurs naturally in the earth's crust and can enter water supplies through normal rainfall, or runoff from factories, animal feed and refineries.
Studies by both CU and the non-profit Natural Resources Defense Council (NRDC) found several bottled waters with levels of arsenic well above the proposed new standards, even though they were within current limits. Their studies also found higher than desired levels of chlorine by-products in some bottled water samples. In addition, the NRDC tested more than 100 brands of bottled water, and found about a third had contaminants levels above state guidelines.
In general, experts agree that most bottled waters are safe to drink and taste fine, although CU also notes that using a carafe or faucet-mounted filter improves taste and can be much cheaper than buying bottles. If you're not sure about your particular brand of bottled water, the NRDC recommends contacting your state health department for information on specific bottled waters. The CU also rates bottled water at its site: www.consumersunion.org .