How to Fix a Leaky Faucet: Step-by-Step Guide for Common Faucet Types

A leaky faucet may seem like a minor inconvenience, but it can quickly lead to bigger problems. A constant drip wastes water, increases utility costs, and can eventually cause stains, corrosion, or damage to sinks and fixtures.

Fortunately, most faucet leaks stem from simple issues such as worn washers, deteriorated O-rings, loose components, or mineral buildup. With a few basic tools and a systematic approach, many of these problems can be diagnosed and repaired without professional assistance. 

This guide explains how to safely shut off the water supply, identify the source of the leak, and gather the tools needed for the job. It then walks through the repair process for the most common faucet types, including compression faucets, cartridge faucets, kitchen sprayers, bathroom faucets, and outdoor spigots.

Common Cause of Faucet Leaks 

A faucet leak can happen for several reasons, but most issues are caused by worn internal components or loose connections. 

Worn Washers and O-Rings

Washers and O-rings naturally wear out over time, particularly in older compression faucets, where the handle compresses a rubber washer against a valve seat each time the water is turned off. As these components age, they can harden, crack, or become misshapen, allowing water to seep through and cause dripping.

A drip from the spout typically indicates worn internal components, such as washers, O-rings, or a cartridge, that are no longer creating a proper seal. Water leaking around the base of the faucet often points to a deteriorated O-ring or gasket within the handle assembly. 

Damaged Faucet Cartridges and Internal Components

Cartridge faucets have their own typical failure points. Over time, cartridges can wear out or become obstructed by mineral deposits, reducing their ability to form a proper seal. Corrosion or damage to the valve seat can also create small gaps that allow water to leak continuously. In some cases, the problem is even simpler, such as a loose screw, a deteriorated gasket, or fittings that have gradually loosened through years of regular use.

If the leak is coming from beneath the sink, the cause is more likely to be a loose supply-line connection or a faulty shutoff valve.

How to Safely Shut Off the Water Supply Before Faucet Repair

Before repairing a leaky faucet, always turn off the water supply to prevent unexpected leaks, water sprays, and potential damage.

Most sinks have two small valves, one for hot water and one for cold water, connected to the supply lines. Turn each valve clockwise until it stops to shut off the water flow to the faucet.

If the valves are difficult to turn, are not functioning properly, or if the fixture does not have individual shutoff valves, you will need to shut off the main water supply to the property. The main shutoff valve is typically located near the water meter or where the main water line enters the building.

Once the water supply has been turned off, open the faucet to drain any remaining water and relieve pressure in the lines. This simple but important step helps prevent unexpected sprays, creates a safer working environment, and ensures the fixture is ready for repair.

Tools Needed to Repair a Leaky Faucet

Most faucet repairs can be completed with a small selection of basic tools rather than requiring a fully stocked toolbox. Having the right tools and replacement parts ready before starting can make the repair process faster, safer, and more efficient.

Essential Tools for Faucet Repair

• Adjustable wrench or open-end wrenches – Useful for loosening nuts, supply-line fittings, and other faucet components.
• Phillips and flathead screwdrivers – Needed for removing faucet handles, screws, and decorative trim.
• Allen wrench (hex key) – Required for many modern faucets that use recessed set screws, typically 1/8 inch or 3/32 inch.
• Flashlight – Helps improve visibility when working in tight spaces beneath the sink.
• Towel or small bucket – Used to catch any remaining water in the supply lines during repair.

Common Replacement Parts and Materials

• Washers and O-rings – Common replacement parts for worn seals that cause dripping faucets.
• Replacement cartridge – Needed for cartridge faucets with damaged or worn internal components.
• Plumber’s tape (Teflon tape) – Helps reseal threaded connections and prevent future leaks.

With these basic tools and materials on hand, you will be well prepared to tackle most common faucet repairs efficiently, safely, and with minimal mess.

How to Identify Your Faucet Type Before Repair

Before looking at how to repair the faucet, it is important to know what type you have. If you are confused whether you have a compression or cartridge faucet, follow these guidelines. 

Compression Faucet

• Has two separate handles: one for hot water and one for cold water.
• The handle becomes tighter as you turn it off.
• Uses a rubber washer and valve stem to control water flow.
• Leaks are often caused by worn washers or O-rings.

Cartridge Faucet

• Can have one or two handles.
• The handle movement feels smooth and consistent.
• Uses a removable cartridge to control water flow.
• Leaks are commonly caused by worn cartridges or damaged seals.

If you are unsure which type of faucet you have, remove the handle to inspect the internal mechanism. A compression faucet will contain a washer and stem assembly, while a cartridge faucet will have a removable cartridge.

How to Repair a Compression Faucet

A compression faucet is one of the easiest faucet types to repair because leaks are usually caused by a worn rubber washer or O-ring. Replacing these small components can often restore a proper seal and eliminate dripping.

Steps to Repair a Compression Faucet

1. Shut off the water supply.
2. Remove the decorative cap and unscrew the faucet handle.
3. Use a wrench to loosen the packing nut and remove the valve stem.
4. Remove the rubber washer secured at the base of the stem.
5. Replace the washer with a new one of the same size and type.
6. Inspect the O-ring for cracks, flattening, or signs of wear, and replace it if necessary.
7. Reassemble the faucet, restore the water supply, and check for leaks.

How to Repair a Cartridge Faucet

Cartridge faucets are designed for smooth and reliable operation, but leaks often occur when the internal cartridge becomes worn or damaged. Replacing the cartridge is usually the most effective solution.

Steps to Repair a Cartridge Faucet

1. Shut off the water supply.
2. Remove the faucet handle by removing the decorative cap and loosening the set screw with an Allen wrench.
3. Remove the retaining clip or nut holding the cartridge in place.
4. Pull the cartridge straight out of the valve body.
5. Inspect the cartridge for cracks, damaged seals, or mineral buildup.
6. Replace it with an identical new cartridge.
7. Clean the valve body and apply plumber’s grease to the O-rings.
8. Reassemble the faucet, restore the water supply, and test for leaks.

How to Fix a Leaking Kitchen Sprayer

A leaking kitchen sprayer is typically caused by one of three issues: a worn hose, a malfunctioning diverter, or a defective sprayer head. 

Steps to Repair a Kitchen Sprayer

1. Begin by turning off the water supply.
2. Check for cracks, kinks, or signs of moisture around the hose connections, as these are common sources of leaks.
3. If the leak occurs only when the sprayer is in use, the diverter valve inside the faucet body may be sticking or partially obstructed by mineral deposits. Access the diverter according to the faucet design, then clean or replace the component as necessary.
4. When water sprays unevenly, or leaks from around the trigger mechanism, the sprayer head itself is often at fault. In many cases, replacing the sprayer head is the quickest and most effective solution.
5. After completing repairs or replacements, reassemble the components, restore the water supply, and test the sprayer thoroughly.

How to Repair a Leaking Bathroom Faucet

A bathroom faucet often develops leaks as a result of worn cartridges, washers, or seals that have deteriorated through years of regular use. Fortunately, the repair process is usually straightforward. 

Steps to Repair a Bathroom Faucet

1. Begin by turning off the water supply.
2. Remove the faucet handle. Depending on the design, this may require loosening a small set screw or removing a decorative cap to access a concealed screw.
3. With the handle removed, access the cartridge or valve stem assembly. A leak from the spout typically indicates that the cartridge, washer, or other sealing component is no longer functioning properly.
4. Remove the cartridge and inspect it for signs of wear, such as cracks, mineral deposits, or hardened rubber seals. If the faucet uses a traditional stem-and-washer design, replace the washer and inspect the O-ring at the same time, replacing it if necessary.
5. Leaks around the base of the faucet are often caused by worn O-rings, damaged seals, or loose connections around the faucet body. Replace any damaged or deteriorated components.
6. Reassemble the faucet, restore the water supply, and test the fixture to ensure smooth operation and a steady, leak-free flow of water.

How to Fix a Leaking Outdoor Faucet or Spigot

An outdoor faucet, or hose spigot, often begins to leak when its rubber sealing components wear out after years of exposure to the elements, fluctuating water pressure, and mineral deposits. 

Steps to Repair an Outdoor Faucet

1. Begin by turning off the water supply.
2. Check the packing nut located directly behind the handle. In some cases, tightening the packing nut slightly with a wrench is enough to stop the leak.
3. If the problem persists, remove the handle and withdraw the stem assembly.
4. The rubber washer at the end of the stem is a common point of failure, particularly on older frost-free faucets. Replace the washer with a matching replacement and inspect any O-rings on the stem for signs of wear or deterioration, replacing them as needed.
5. Leaks around the handle are often caused by worn packing material inside the bonnet assembly. Replacing the packing string or packing washer will usually restore a proper seal and prevent water from escaping around the stem.
6. Once all necessary components have been replaced, reassemble the faucet, restore the water supply, and test the fixture.

In most cases, renewing these inexpensive wear parts is all that is required to restore proper operation and eliminate water loss. 

Frequently Asked Questions About Leaky Faucets 

Why is my faucet dripping after I turn it off?

A faucet that keeps dripping after being turned off is usually caused by worn washers, O-rings, cartridges, or damaged seals that are no longer creating a proper seal.

Can I fix a leaking faucet myself?

Yes, many common faucet leaks can be repaired with basic tools by replacing worn parts such as washers, O-rings, or cartridges.

Should I repair or replace a leaking faucet?

Repair is usually enough for minor issues, but replacement may be better if the faucet is severely corroded, repeatedly leaks, or requires frequent maintenance.

How long does a faucet cartridge last?

A faucet cartridge can last several years, but hard water, mineral buildup, and frequent use can shorten its lifespan.

Final Thoughts on Fixing a Leaky Faucet

A leaky faucet is often a simple problem that can be fixed by replacing worn parts such as washers, O-rings, cartridges, or seals. By identifying the cause, using the right tools, and following proper repair steps, many common leaks can be resolved without professional help.

However, if a faucet is severely damaged, repeatedly leaks, or requires frequent repairs, replacement may be the better long-term solution. Addressing leaks early helps reduce water waste, lower costs, and prevent further damage.

Consider contacting a professional plumber if the leak continues after replacing worn parts, the shutoff valve does not work properly, pipes are damaged, or the faucet shows signs of severe corrosion.