Is your tap water safe to drink? Unfortunately, as discussed in the article Is Your Water Safe?, it may not be.

Because unhealthy levels of contaminants such as bacteria, lead, and pesticides are found in both metropolitan and well water supplies, it’s important to know whether pollutants exist in your water. And, if they do, you need to know how to supply your home with clean water.

Buying the right water filter can ensure clean, safe drinking water. Dreamstime

Buying bottled water is the quickest and, initially, cheapest way to get clean drinking water. But over the long haul, it is far more expensive, and plastic bottles are wasteful and an environmental blight.

Producers of bottled waters are regulated by the same standards imposed on public water systems and are also self-regulated by the International Bottled Water Association. Club sodas, carbonated waters, seltzers, and waters containing more than 1 percent flavoring are not covered by these standards.

Water filters are the more permanent solution. Many types of water filters are made, and they range widely in sophistication and price. They may use reverse-osmosis, activated carbon, or ultra-violet rays to clean or purify water.

Should you buy an under-the-sink reverse-osmosis filter, or will a simple spout-mounted carbon filter do? Scores of companies claim to have the latest and greatest answer to your water needs. What are your other options?

The effectiveness of a water filter at removing specific contaminants depends upon the technology used. So, it’s important to know what needs to be removed from your water—and that involves testing.


This section of HomeTips explores the issues of clean drinking water, how to get water testing accomplished, comparing filter technologies, and how to install a water filter.

Types of Water Filters

If the only problem with your water is grit, dirt, sediment, rust, or other such particles, a screening filter may be sufficient. Made of fiber, fabric, ceramic, or another screening medium, these simply catch particles—including, in some cases, small organisms like cysts and some bacteria. But don’t rely on them to handle disease-causing organisms, VOCs, metals, or the like.

Carbon Water Filters

If your water tastes, smells, or looks bad, a filter containing activated carbon (AC) may solve the problem. If you want to remove chlorine, pesticides, herbicides, radon, trihalomethanes (THMs), and some inorganic chemicals, carbon may do the trick.

Some, but not all, carbon filters are effective at reducing lead content. Solid-block and pre-coat absorption filters trap lead. Check the certification of the unit you’re interested in buying and, if claims are made regarding lead removal, ask for proof.

Simple carbon filters attach to the faucet, polishing taste and removing some contaminants. Culligan

You can’t rely on a conventional carbon filter to remove salts, nitrates, nitrites, and some metals. And you shouldn’t rely exclusively on one to remove organisms. In fact, be aware that a carbon filter will accumulate the contaminants removed from water, and bacteria may even breed in it, so you must replace filter cartridges religiously, according to the manufacturer’s recommendations.

A carbon filter that contains pesticide silver may be registered—but, remember, is not endorsed—by the EPA. Studies show that these are not fully effective at eliminating bacterial growth or microbiological contaminants. Again, be sure any such claims are substantiated.

Effectiveness of a particular carbon unit is a factor of the amount of activated carbon it contains. You can buy whole-house, under-counter, countertop, and faucet-mounted styles, but the $30 faucet-end models are only marginally effective. Known as point-of-entry (POE) systems, whole-house units are recommended where a contaminant such as radon poses a threat to the entire household.


Reverse Osmosis Water Filters

If you must remove inorganic chemicals such as salts, metals (including lead), minerals, nitrates, asbestos, and some organic chemicals, consider a reverse-osmosis (RO) water filter.

APEC reverse-osmosis drinking water filter APEC

Actually, most models include carbon pre-filters and post-filters, which will catch sediment, pesticides, herbicides, THMs, and radon. RO filters remove lead, but some don’t remove chlorine (if this is claimed, request proof of performance). The carbon post-filter is used to improve the water’s taste.

Pre- and post-filter cartridges should be replaced annually.

Most RO filters are connected directly to plumbing and are located beneath the sink. A small tank stores clean water until needed, and tainted water drains out through a line connected to the sink trap. Drinking water flows through a special, separate sink-top spout.

Some models have an automatic valve that eliminates the waste typically associated with RO filters—conventional models waste about 3 gallons for every gallon of water they produce. They generally cost from $200 to $400.


Water Distillers

If you just want a portable, sink-top appliance that will rid water of most dissolved solids, such as salts, asbestos fibers, metals, minerals, particles, and some organic chemicals, an inexpensive water distiller may be just the thing.

Countertop water distiller purifiers water by turning it to steam. Megahome

Distillers heat water until it turns to steam and then condenses the steam back into water in a separate chamber, leaving behind anything that won’t travel in the steam.

Unless coupled with a carbon filter, they will not remove all chemical pollutants and all bacteria. Most have to be filled manually, they use a considerable amount of electricity to operate, and they may take several hours to produce 1 gallon of water. Prices range from about $80 to $400—most popular models are about $200.

UV Water Purifiers

Ultraviolet (UV) disinfection water filters, which typically cost $150 or more, may kill bacteria and viruses, and clear the taste and odor of water, but they are not effective against chemical pollutants and may not work against cysts and spores. UV may be combined with carbon filters to kill bacteria; these units tend to cost from $300 to $700.

Buying a Water Filtering Faucet

With the popularity of water-treatment devices, a number of manufacturers have introduced products that integrate water systems seamlessly into the kitchen. For example, American Standard makes the Streaming filtering faucet that works with an under-sink filter to deliver filtered water through the main kitchen faucet.

Filtering faucet delivers filtered water right through the main tap. American Standard

Frigidaire offers a built-in PureSource Ice & Water Filter in its Gallery Side-by-Side refrigerators, and the GE Profile Performance Side-by-Side refrigerator offers a “Water by Culligan” built-in filter. Just be sure whatever product you buy utilizes the type of filter needed to mitigate your water problems.

Before you buy, shop around, scrutinizing price, features, capacity, frequency, and cost of filter replacement and warranties. For a listing of certified units and the contaminants they remove, you can contact the independent testing organization NSF International at (800) NSF-HELP and request the Water Fact Kit.

You can also visit its Certified Product Database at By doing your homework, you’re sure to find a product that will offer your family clear, clean water for many years.

Shopping for a Water Filter

To find the right treatment device for your problems, shop around; you will find distinct differences in price, installation methods, maintenance requirements, and warranties.

Be wary if a salesperson claims a device has EPA approval. The EPA doesn’t test or approve products, it only registers them. (For a listing of certified units and the contaminants they remove, contact the independent testing organization NSF International at 800-NSF-MARK or

You can locate certified dealers by contacting the Water Quality Association at 630-505-0160 or

Featured Resource: Find a Local Water Treatment Installation Pro

How to Install a Water Filter
Is Your Drinking Water Safe?
Kitchen Instant Hot Cold Water Dispenser Buying Guide
• How to Solve Water Pressure Problems

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About Don Vandervort
Don Vandervort has developed his expertise for more than 30 years as a remodeler and builder, Building Editor for Sunset Books, Senior Editor at Home Magazine, author of more than 30 home improvement books, and writer of countless magazine articles. He appeared for 3 seasons on HGTV’s “The Fix,” and served as MSN’s home expert for several years. Don founded HomeTips in 1996. Read more about Don Vandervort