Why Is My Kitchen Faucet Leaking?

Kitchen faucets are essential fixtures that we use daily, often without a second thought—until they start leaking. A leaking kitchen faucet can be more than an annoyance; it can lead to increased water bills, damage to your sink or countertop, and even more serious plumbing issues if left unaddressed. Understanding why your faucet is leaking is the first step in tackling the problem effectively. Common leaks can occur in different parts of the faucet, such as at the base, spout, or within the internal components, and each has its causes and solutions. Issues, like worn internal components and buildup of sediment, are all frequent culprits that can compromise the faucet’s performance over time. This guide will help you identify the cause of your kitchen faucet leak and provide step-by-step instructions on how to fix it, whether it’s a simple drip or a more stubborn leak.

Common Causes of Kitchen Faucet Leaks

Kitchen faucet leaks can arise from various issues linked to specific components within the faucet assembly. Understanding the most common causes can help you pinpoint the exact source of the leak and address it effectively. Here’s a closer look at the primary culprits:

O-Rings:

O-rings are small rubber rings that form seals at various points in the faucet, particularly around the spout and handle. Over time, these rings can become worn, brittle, or damaged due to constant use, mineral buildup, or exposure to harsh cleaning chemicals. When an O-ring wears out, it loses its ability to create a watertight seal, leading to leaks around the base of the spout or near the handles. 

Replacing worn O-rings is often a straightforward fix that can immediately resolve the leak if it is the source.

Washers:  

Washers are flat, circular discs usually made of rubber, silicone, or metal, and they seal connections and control water flow within the faucet. Compression faucets, in particular, rely heavily on washers to stop water flow when the faucet is turned off. Over time, these washers can wear down, become misaligned, or even degrade, causing leaks when the faucet is in use or turned off. Worn washers are one of the most common reasons for a dripping faucet and can typically be replaced with basic tools.

Cartridges and Diverter Cartridges:

Many modern kitchen faucets use cartridges to control the flow and temperature of the water. These cartridges, which are often made of plastic or brass, can wear out over time, leading to leaks around the handles or inconsistent water flow.

Diverter cartridges, which control the flow between the main spout and any additional features like a side sprayer, can also become clogged or damaged, causing leaks or malfunctioning spray functions. To fix these issues, you’ll need to replace the cartridge or diverter cartridge. This involves removing the faucet handle, extracting the old cartridge, and inserting a new, compatible one. It’s important that you have the correct replacement cartridge for your specific faucet model to restore proper function.

Valve Seats & Springs:  

The valve seat is a small part between the faucet and the spout. It acts as a connection point where the faucet’s valve compresses to shut off water flow. Due to constant exposure to water, valve seats can corrode or become worn, leading to leaks at the spout base. Sediment and mineral deposits from hard water can accelerate this process, causing rough surfaces that prevent a proper seal. Cleaning or replacing a corroded valve seat can often resolve leaks originating from this component.

How to Replace Seats & Springs

Corrosion, Wear and Tear, and Sediment Deposits:  

Corrosion and general wear and tear are natural consequences of frequent use and aging. Corrosion can weaken metal parts, create cracks, and compromise seals, while regular wear can degrade rubber and plastic components. Additionally, sediment deposits from hard water can accumulate inside the faucet, clogging small openings and affecting the movement of internal parts. These buildups not only hinder the faucet’s operation but also exacerbate leaks by creating uneven surfaces and preventing components from sealing properly. Regular cleaning and maintenance can help mitigate these issues, but over time, component replacement may be inevitable.

Identifying the Leak Source

Different leaks require different approaches, so pinpointing where the water is escaping from can save you time and effort. 

Leaking at the Base of the Faucet/Spout

A leak at the base of the faucet is typically characterized by water pooling around the bottom of the faucet when it’s in use. This type of leak is often caused by worn O-rings or a deteriorated seal between the faucet and the sink. These leaks are also often intermittent, occurring only when the faucet is in specific positions or when water pressure is high. To confirm this is the issue, start by wiping the base of the faucet dry, then turn on the water and observe closely. If you notice water seeping out where the faucet meets the sink, you’re likely dealing with a base leak. It’s important to address this type of leak promptly, as water pooling at the base can damage countertops, cause mold growth, and even seep into cabinetry over time.

Inspecting Hoses and Supply Lines

Leaks aren’t always confined to the visible parts of the faucet; they can also originate from the hoses and supply lines that connect your faucet to the main water supply. To inspect these components, look under the sink and examine the hoses and connections for any signs of moisture, rust, or mineral deposits, which can indicate a slow leak. Pay special attention to the connection points where the hoses attach to the faucet and the shutoff valves (typically located on the wall). A leak in the supply lines can often be mistaken for a faucet leak, but addressing this issue might involve tightening connections, replacing washers, or even replacing the entire hose if it’s damaged.

Other Potential Leak Sources

Other components such as the faucet handles and sprayer hoses can also be leak points. To check these, operate the faucet in various modes (e.g., switching from the main spout to a side sprayer) and observe if leaks occur under specific conditions. A leak from the handle area, for example, might indicate a problem with the handle’s internal cartridge or stem, which will require different steps to repair.

After identifying where your faucet is leaking, you can apply the correct fix with confidence, minimizing effort and expense. Understanding the nature of the leak guides you in repairs and helps maintain your faucet’s performance over time.

How to Fix a Leaking Kitchen Faucet

Fixing a leaking kitchen faucet may seem daunting, but with the right tools and a clear understanding of the problem, most repairs can be tackled easily, even for those with minimal plumbing experience. This section provides step-by-step guidance on fixing the most common faucet leaks, whether it’s a persistent drip or a full blown leak.

Fixing a Dripping Faucet Spout or Base

A dripping faucet is one of the most common issues homeowners face, and it’s often caused by worn-out washers, O-rings, or valve seats. To fix a dripping faucet, you’ll first need to turn off the water supply to the faucet. This can usually be done by shutting off the valves under the sink. Next, remove the faucet handle, which may require a screwdriver or an Allen wrench for a set screw, depending on the model. Once the handle is off, you’ll have access to the internal components.

Applying Plumbers Tape to Spout Threads:  

Plumber’s tape, also known as Teflon tape, is a handy tool for sealing threaded connections and preventing leaks. If you’ve identified leaks at threaded connections, such as those between the spout and the faucet body, applying plumber’s tape can help. First, remove the spout or any threaded component, then clean the threads to remove any old tape, debris, or buildup. Wrap the threads with the new plumber’s tape, ensuring that the tape is applied tightly and in the direction of the threads to prevent it from unraveling during reassembly.

Typically, two to three wraps of tape are sufficient to create a watertight seal. Once the tape is applied, reattach the spout or component, making sure it’s tightened securely. Turn the water back on and test the faucet for leaks, adjusting as necessary to ensure a proper fit.

Inspecting and Repairing Hoses and Supply Lines:

If your inspection has revealed that the hoses or supply lines are leaking, turn off the water supply and use a wrench to carefully loosen the fittings at the ends of the hoses. Inspect the washers inside the fittings for wear or damage, and replace them if necessary. If the hose itself is cracked, frayed, or shows signs of corrosion, it’s best to replace it entirely. New hoses are relatively inexpensive and can be found at most hardware stores.

When to Call a Professional

While many faucet leaks can be resolved with basic tools and a bit of know-how, there are times when it’s best to call in a professional plumber.

Persistent Leaks After DIY Repairs

Leaks Involving Complex Faucets

Significant Corrosion or Damage

Plumbing Issues Beyond the Faucet

Safety Concerns