Faucet Basics: What are Faucets Made of?

For the money, a basic American faucet may be one of the best consumer values around. Designed to last a lifetime, all but the cheapest almost certainly will, and if they don't, the manufacturer will at least replace the defective parts.

Today's faucets are designed to survive very harsh conditions, including thousands of on-off cycles every year and hard water mineral build-up, and still give year after year of flawless service. And, if it does break, a faucet is usually designed to be serviced by simply replacing the defective parts — typically a screwdriver operation — without first having to remove the faucet from its installation.

Modern finishes are unlikely to flake or tarnish. Modern plating and coating processes, including electron beam physical vapor disposition, can imitate anything - brass, nickel, pewter, even gold. Epoxy coatings can keep that new finish looking new for a long time, with proper care.

Faucet valves rarely leak. Ceramic cartridge technologies have almost entirely banished the midnight drip, drip, drip. But, some of the best faucets still use the old technologies that still work well. These may require periodic replacement, not an onerous task, especially for the old house purists. But, for the rest of us, the newer no-maintenance ceramic technology is a better choice.

A Rose May Always Be a Rose, But a Faucet is Not Always a Faucet

There is almost no language more confusing than Plumber. You'd think that a trade barely 300 years old would be a little less complicated, unlike carpentry, which is several millenia old, and has a very odd lingo indeed.

One of the most confusing terms in plumbing is the name of the device that controls the flow of water. In North America the most common term is "faucet". In England and the former Commonwealth nations, except Canada, the term is "tap". The two terms can be used interchangeably, along with "Spigot" and "valve".

In the U.S. a "faucet" usually refers to a decorative plumbing device used to control the flow of water inside the house. A "spigot" or "Bibb" is an outside faucet, and you probably have a few attached to the side of your house. It may also be known as a "hose Bibb", a "Bibbcock", a "sillcock", a "garden valve" or a "hose hydrant".

"Valve" is nicely ambiguous term. Technically, a plumbing valve is any device that turns on and off the flow rate of water. A faucet is a "valve" Within the generally accepted meaning of the term, but but not all valves are faucets. A faucet also contains a valve — meaning the part of the faucet that actually regulates water flow, as distinct from other parts of the faucet such as the body, spout, handle, etc. that do not.

To add further to the confusion, a faucet "valve" is often confused with a faucet "cartridge" and the two terms are frequently used interchangeably. A cartridge is a housing for a valve, in fact it is often called a "valve cartridge" to distinguish it from other types of cartridges. But, while a cartridge always contains a valve, a valve is not always contained within a cartridge. A lot of faucets still have valves that are built into the faucet body itself rather than into a removable cartridge. An outside spigot or hose Bibb, for example, is likely to have an old style compression valve that is built into the faucet body.

The difference between a "mixing cartridge" and "mixing faucet" also causes confusion. A mixing cartridge may be inside a mixing faucet, but a faucet can mix without a mixing cartridge. A mixing faucet is any faucet in which hot and cold water are blended together inside the faucet. Virtually all sink, tub and shower faucets are mixing faucets. Non-mixing faucets are not usually found inside the house. But outside, the hose Bibb is a non-mixing faucet. Unless you have done something strange to the plumbing, an outside spigot delivers only cold water.

Mixing faucets usually have two handles, one to control the volume of cold water, and a separate handle to control the volume of hot water. Temperature is regulated by adjusting the amounts of hot and cold water entering the spout.

In a "mixing cartridge", water temperature is mixed inside the cartridge before the water is released into the faucet. These are always single handle faucets that control the mix of hot and cold water and the volume of water. Water volume is independent of water temperature. The flow of water can be changed without changing the water temperature, and the temperature can be regulated without altering the volume of water flow.

If you have a single handle mixing cartridge faucet in your house, try it. Turn on the water and move the handle right or left until you get the temperature you want. Move the handle up or back to increase the volume of water. Notice that the temperature did not change. Move the handle down or forward to decrease the flow of water, and still the temperature does not change. Push the handle all the way down to turn off the water, then turn it back on again. The water is still at the temperature at which you left it when you turned the faucet off. It seems so simple that it's easy to forget that it took an enormous amount of creativity and over 70 years to get faucets to work like this.
Unfortunately the classic American faucet is increasingly not made in the good old U. S. of A. Some manufacturers have maintained substantial domestic manufacturing, but many faucets are now made elsewhere — from China to the Balkans — and merely distributed by American companies under their own brands. for example, are long-established U.S. manufacturers that no longer manufacture any faucets in the U.S.

As with anything, some faucets are better than others, and price, while generally reflective of quality, is no absolute guarantee. You do not necessarily get a better faucet for more money. All of the major faucet manufacturers, make mid-priced faucets that are lifetime or near-lifetime products. When you pay more than mid-price ($100-$300) then you are generally buying the cachet of high-style ( or custom hand finishing ( or both. These are usually excellent faucets, but not necessarily a quantum leap better than major-brand mid-priced brands. They are produced in smaller runs or even made one at a time as they are ordered, so they do not have the cost savings of large production quantities. Thus the higher price. But, even these are often sharply discounted,

What's It Made Of

Any material that will hold water can be used to make a faucet.

Faucets have been created from wood, glass and ceramics, although these materials are not in common use. More typically, faucets are made from low-corrosive metals: pewter, copper, bronze, brass, stainless steel, and zinc alloys. Faucets can also be made of plastic.


The traditional material for faucets is brass. Brass is an alloy of copper and zinc with small amounts of other metals. Aluminum may be added to make the brass stronger and more corrosion resistant — the so-called naval or admiralty brasses used in salt-rich maritime environments contain a relatively high proportion of aluminum. Tin is also added to combat a process known as dezincification, in which the brass loses its zinc over time when exposed to water, making the remaining brass brittle and porous.

The copper in brass is anti-microbial — it kills germs — although no one yet understands exactly how the process works. What we do know is that many fungi (mold and mildew) and most bacteria cannot survive in the presence of copper. In tests on colonies of E. Coli bacteria conducted by the EPA, 99.9% of the colony was killed after two hours of exposure to brass.

Brass is prized for faucets because it is very resistant to corrosion, has a relatively low melting point — making it easy to cast — is soft enough to machine with little effort yet hardy enough to endure the rigors of life as a faucet, takes finishes such as chrome plating very well, and is easily recycled. About 80% of the brass used in new faucets was previously used to make something else.

The brass used in faucets today is not the same brass used as few as five years ago. Lead, a common additive in brass, used to make it more machinable, is virtually banned in faucets and most other plumbing fittings and fixtures. Before 2014 a faucet could contain as much as 8% lead and still call itself lead free. Now the maximum lead content in a faucet is 0.25%, that is, one-quarter of one percent. To comply with the new restrictions on lead, today's faucet brass is "lead-free" brass that uses other additives for malleability. A common substitute is silicon.

Stainless Steel

The other upscale material for faucets is stainless steel.

Steel is harder than brass and has a higher melting point, making it more difficult than brass to cast and machine. But, it also contains no lead, which in today's regulatory environment is a big plus. Stainless is a steel alloy containing at least 10.5% chromium. But, the stainless steel used in faucets is usually 304 stainless also known as 18/8 stainless due to its composition of 18% chromium and 8% nickel. The nickel gives the steel a particular crystalline structure which increases its strength and malleability.

Some upscale stainless sinks are made from 18/10 stainless, a slightly better grade used to make knives, fine cookware, flatware and restaurant-quality stainless sinks. The added nickel makes the alloy a little harder, and able to take a higher polish. But, some less expensive faucets, made primarily in Asia, contain a lower quality stainless. As a buyer you should always look for an indication that the steel used in the faucet is 304 grade, 18/8 or 18/10 steel. Just the word "stainless" is not enough.


Less expensive faucets are often made of a zinc alloy called ZAMAK or ZAMAC in which zinc is combined with aluminum, magnesium and copper. Developed by the New Jersey Zinc Company in 1929, the original use of this "pot metal" was to replace more-expensive brass in applications where the durability of brass was not needed, but its corrosion resistant properties were. Its is commonly used in the manufacture of die cast objects such as children's toys, model trains, locks, cabinet pulls and knobs, zippers, and plumbing fixtures, including faucets. It is a distinctive metal, dull and gray, but can be plated with chrome or another finish metal so as to be indistinguishable from an all-brass faucet.

Most faucets that are made of ZAMAK will say so on the box, sometimes indirectly. The phrase "all metal" on the box tells you that parts of the faucet are probably ZMAK. If its all brass, the box will say "All brass". However, some companies get tricky, such as "all brass body and spout" means that the handles are probably ZMAK. "Brass construction" almost always mean some of the parts are ZAMAK, as opposed to "All brass construction". "All brass faucet" is another tricky phrase. It sometimes means that the faucet is all brass, but it may also mean that the body of the faucet is brass but the spout and handles are ZAMAK.

Why is Plastic a Problem?

Your water contains dissolved minerals. Among these are magnesium, limestone, iron, silica, and even granite.

When water flows through your faucet some of these minerals are left behind as very hard, rock-like, deposits. In your bathtub or sink these are known as "lime scale" or "mineral deposits" and they are the very devil to get rid of after they have built up for a while and etched into the fixture material.

They behave the same way inside your faucet where you can't get at them, or even see them. They grind away at the internal moving parts of your faucet, wearing them down over time. Brass and steel can handle the abuse for years and years without failing, plastic cannot.

We're not picking on plastic. We think that the many plastics available have lots of legitimate uses in construction and remodeling. It's just that no plastic is tough enough to be used in a faucet no matter how pretty it looks.
Another indication is the weight. ZAMAK faucets are considerably lighter than all brass or stainless faucets. But, we have found that the best way to check for ZAMAK is to get a peak inside the faucet. This may require one guy to wield a screwdriver and another to distract the store clerk. Removing the handle for a quick look inside the casting where it joins the stem often tells the tale. If it's gray metal, the casting is ZAMAK, if its "coppery", it's brass. A glance up the spout may also help reveal the faucet's composition, and does not require any disassembly. A pen-light is helpful here. A dull gray spout is ZAMAK. If it's brown, green or "brassy", then its brass.

Zinc is not as durable as brass and does not survive the hostile, corrosive environment of a faucet nearly as well as brass or stainless steel. Which is why the best faucets do not harbor ZAMAK.


We have never seen advice from a responsible source on the purchase of a plastic faucet other than some variation of "Run, run away, fast and far." That is also our advice. Plastic is not a suitable material for faucets, particularly faucet bodies and spouts. It is simply not durable enough for a faucet. And, there is no reason to buy a plastic faucet when for a very few dollars more you can always find a suitable metal faucet — maybe not all brass, but at least ZAMAK, which is a giant step up from plastic.

But, there is at least one form of plastic that does work, and works well in faucets. It is cross-linked polyethylene, commonly known as PEX. PEX has been used with good effect to replace copper water pipes for over 20 years, and is recognized by all national plumbing codes as a suitable material for water channels. It is, in many ways, better than copper because it is a lot less expensive, easier to install, and is much less likely to burst from freezing.

It has only very recently begun to be used in faucets, largely in response to the very low lead requirements of the Safe Drinking Water Act effective in January 2014. Since, brass contains small amounts of lead, one technique for reducing lead in drinking water is to replace the brass parts of a faucet that come in contact with water with something that is not brass. Copper and stainless steel are probably the best choices, but increasingly faucet companies are using PEX for water channels within the faucet, replacing the traditional brass channels.

Advanced technology faucets such as many Delta and Brizo faucets have replaced all of the internal faucet waterways with PEX. PEX connects the shut-off valves under the sink directly to the faucet valve, and the faucet valve to the water exit point in the spout. The faucet body and spout have nothing to do with water flow, they are just decorative shells disguising the PEX tubing and cartridge valve inside. No water ever touches metal, so no lead can leach into the water.

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Rev: 08/14/15