Understanding Your Kitchen Faucet: Parts and How They Work
Before you attempt any repairs, it helps to understand the basic structure of a kitchen faucet and what each part does. A typical kitchen faucet consists of several key components working together to deliver water at the right temperature and pressure. The spout is the visible part that extends over your sink, and it's where water flows out. Inside the faucet body are valves that control water flow, a cartridge or ball mechanism that mixes hot and cold water, an aerator at the spout tip that breaks up water into smaller streams, and internal seals and washers that prevent leaks.
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Different faucets use different internal mechanisms. Single-handle faucets with a ball mechanism are common in many homes—these have a rounded cap that moves in different directions to control water temperature and flow. Cartridge faucets use a cylindrical insert that moves up and down or side to side to regulate water. Compression faucets, the oldest style still found in some homes, use two separate handles connected to rubber washers that compress against valve seats. Understanding which type you have is crucial because repair methods differ significantly between these styles.
The supply lines beneath your sink are flexible tubes that carry hot water from your water heater and cold water from your main supply line to the faucet. These lines can develop leaks or become loose over time. The shutoff valves under the sink allow you to stop water flow to just the faucet without shutting off water to your entire home—a critical safety feature when doing repairs. Many homes also have an aerator, a small screen-like component at the faucet spout that can become clogged with mineral deposits and debris.
Common problems stem from worn internal parts, mineral buildup, loose connections, or damaged seals. A dripping faucet often indicates a worn washer or cartridge that no longer seals properly. Reduced water pressure might mean an aerator clogged with minerals or sediment. Low or no hot water at that faucet could indicate a problem with the hot water supply line. Water pooling under the sink suggests leaking connections or a crack in the supply lines. Knowing which component is failing helps you determine whether you can fix it yourself or need professional help.
Practical Takeaway: Locate the shutoff valves under your sink and turn them to verify they work before you start any repair. This prevents water from spraying everywhere if something goes wrong. Take photos of your faucet from different angles and note the brand and model number, usually found on a sticker or engraved on the body—this information helps you find the correct replacement parts if needed.
Fixing a Leaking or Dripping Faucet
A faucet that drips or leaks is one of the most common problems homeowners face, and it wastes significant amounts of water over time. According to the U.S. Environmental Protection Agency, a single faucet dripping at the rate of one drip per second wastes more than 3,000 gallons of water annually. Beyond water waste, the constant dripping sound can be annoying, and leaks can stain your sink or lead to water damage under the cabinet.
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For compression faucets with two handles, the most frequent cause of dripping is a worn rubber washer. To repair this, first shut off the water using the valves under the sink. Turn on the faucet to release any remaining water pressure. Use an adjustable wrench to remove the handle by loosening the packing nut—the nut directly under the handle. Once removed, you'll see the stem. Unscrew the stem by turning it counterclockwise. At the base of the stem, you'll find a screw holding a rubber washer in place. Remove this screw and replace the worn washer with a new one of the same size, available at any hardware store for under a dollar. Reassemble everything in reverse order, tightening firmly but not so tight that the handle becomes hard to turn.
For single-handle ball faucets, a drip usually means the seals inside have worn out. These faucets require purchasing a replacement cartridge or seal kit specific to your faucet brand. The repair involves removing the handle (often by loosening a set screw hidden under a decorative cap), then using a special removal tool or wrench to extract the cartridge. Once removed, you can install the new cartridge following instructions included with the part. This repair typically costs between $15 and $50 for parts.
Cartridge faucets with a single or double handle also develop leaks when their cartridge wears out. The repair process is similar: shut off water, remove the handle, and extract the cartridge using the appropriate tool. One advantage of cartridge faucets is that you can sometimes purchase just the seals and springs rather than the entire cartridge, reducing costs to under $10. However, if the cartridge body itself is damaged, replacement is necessary.
If water pools under the sink rather than dripping from the spout, the problem likely involves the supply line connections. Tighten the connection nuts where the supply lines connect to the faucet body using two adjustable wrenches—one to hold the fitting steady while you turn the nut with the other. If tightening doesn't stop the leak, the supply line itself may be damaged and requires replacement. Fortunately, supply line replacement is straightforward: turn off the water, disconnect the old line by unscrewing the nuts at both ends, and install a new braided stainless steel supply line, which costs between $5 and $15.
Practical Takeaway: Before buying replacement parts, identify your faucet brand and model number. Take a photo and bring it to the hardware store, or search online for "[brand] [model] replacement cartridge" to ensure you purchase the correct part. Many stores will accept returns if you bring the part back with your receipt, so you won't waste money if you bought the wrong one.
Clearing Mineral Buildup and Improving Water Pressure
If your kitchen faucet produces weak water pressure or the spray pattern seems off, mineral deposits clogging the aerator are likely responsible. Hard water—water containing high levels of calcium and magnesium minerals—creates buildup that restricts water flow. In regions with very hard water, this problem develops within months. Fortunately, cleaning the aerator is one of the simplest faucet repairs and requires no special tools or replacement parts.
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To clean the aerator, first locate it at the tip of your spout. Most aerators have a small collar that unscrews by hand, though some may require a small wrench or pliers with a cloth to prevent scratching the finish. Once unscrewed, you'll see several components: typically a screen, a flow restrictor, and a diffuser. Rinse these parts under warm water and use an old toothbrush to scrub away mineral deposits. For stubborn buildup, soak the components in white vinegar for two to four hours—the acetic acid dissolves mineral deposits effectively. After soaking, scrub again and rinse thoroughly before reassembling and screwing the aerator back onto the spout.
If cleaning the aerator doesn't fully restore water pressure, the problem may lie deeper in the faucet body or supply lines. Sediment can accumulate inside the faucet's internal passages. To address this, shut off water at both the hot and cold supply lines under the sink. Turn the faucet on to release pressure. Disconnect the supply lines by unscrewing the connection nuts. Place a small bucket under each line to catch any remaining water. Turn the shutoff valves back on briefly to flush sediment from the lines into the bucket, then turn them off again. Reconnect the supply lines, turn the shutoff valves back on, and test the pressure.
Another cause of low pressure could be a clogged cartridge in single-handle faucets. If the pressure is low on both hot and cold water, the problem is likely in the faucet itself rather than the supply. Replacing the cartridge or thoroughly cleaning it by removing it and flushing it with water may restore flow. Some cartridges have small passages that can become blocked with mineral deposits, and soaking them in vinegar before reinstalling sometimes helps.
For homes with extremely hard water, installing a whole-house water softener reduces mineral buildup throughout your plumbing system, benefiting all faucets and fixtures. However, this is a larger investment, typically costing $1,000 to $3,000 for installation. A less expensive option is installing a faucet