Fixing a Bathroom Faucet Drip: A Practical Repair Guide

A slow drip from a bathroom tap is more than an annoyance. It wastes water continuously and can signal a failing internal component that will worsen if ignored. This guide breaks down the most common causes of faucet leakage, maps each symptom to its likely source, and outlines the steps needed to repair the unit without replacing the entire fixture.

Identify the source of the drip

Before opening any part, determine where the water is actually coming from. A drip at the spout tip usually indicates a valve or cartridge issue. A seep around the base of the handle points to a worn stem seal or O ring. Water leaking from the spout when the tap is fully closed often signals a damaged seat or a stuck cartridge.

Check the type of faucet first. Single handle models rely on a cartridge or ceramic disc mechanism. Two handle models typically use compression stems with rubber washers. The repair method differs significantly between these designs. Using the wrong part will not fix the problem and may create a new leak.

Observe the drip pattern under normal conditions. If the water drips evenly at a steady rate, the failure is likely in the sealing surface that closes the valve. If the drip is irregular, the mechanism may be catching on debris or failing to seat fully. For a single lever tap, move the handle through its full range of motion. If the drip stops only at a specific point, the internal stopper or detent may be worn. For a two handle tap, close the hot and cold handles completely. If one side drips while the other does not, the fault is isolated to that specific stem and supply line.

Look at the water stream itself. A stream that wanders or splits often indicates a damaged aerator or a warped seat. A stream that is thin and weak usually points to a partially blocked inlet or a failing valve. Check the aerator at the spout tip. Remove it and run the tap. If the flow improves, the aerator is clogged with scale or debris. If the flow remains weak, the blockage is deeper inside the faucet body or the supply line. This distinction saves time. You can clean an aerator in minutes. You cannot fix a clogged internal valve by cleaning the tip.

Check the water supply and pressure

High or unstable water pressure accelerates wear on internal seals. If the drip started after a pressure surge or pipe replacement, inspect the supply lines. Loose connections at the shutoff valves can introduce vibration into the faucet body. Tighten fittings with the appropriate wrench, but avoid over torqueing brass or chrome parts.

If the house supply pressure is consistently high, consider a pressure reducing valve at the main inlet. This protects all bathroom fittings from excessive stress. Do not ignore pressure issues when diagnosing a drip, as they often mask the true mechanical failure.

Measure the pressure at a nearby outdoor spigot or a convenient access point. A standard pressure gauge attaches to the threaded outlet. Most residential systems operate within a reasonable range, but fluctuations can cause problems. If the needle swings wildly, the supply system may be unstable. This instability puts extra stress on the O rings and washers inside the faucet. The seals are designed to handle steady pressure. Rapid changes cause the rubber to fatigue faster.

Inspect the flexible supply lines that connect the shutoff valves to the faucet body. Look for kinks, bulges, or corrosion at the connection points. A loose connection here can vibrate as water flows. This vibration works on the internal seals and can loosen the handle screws. Tighten the connection nuts with an adjustable wrench. Use a cloth to protect the finish of the faucet body. Do not use a pipe wrench directly on the chrome or brass body, as this will scratch and damage the finish.

If the drip started immediately after a plumbing project, check the new supply lines. Sometimes the new lines are too short, causing them to pull on the faucet body. Or they are too long, causing them to kink. Ensure the lines hang naturally without tension. The faucet should be supported by the deck or the wall, not by the supply lines.

Disassemble the faucet safely

Shut off the cold and hot supply valves under the sink. Open the faucet to release remaining pressure. Place a towel in the basin to catch small parts. Remove the decorative cap on the handle, then unscrew the handle screw. Lift the handle off the stem or cartridge.

For compression stems, use a stem wrench to remove the packing nut. For cartridge types, you may need a cartridge removal tool. Take clear photos at each stage. This helps you reassemble the unit in the correct order. Keep all washers, springs, and O rings together in a labeled container.

Before you begin, identify the faucet make and model if possible. Look for a label on the body or the underside of the sink. If there is no label, measure the cartridge or stem dimensions. Take a photo of the internal parts before removal. This serves as a reference when you buy replacement parts.

For a two handle compression tap, you will need a stem wrench. This tool fits around the hexagonal stem. Place the wrench on the stem and turn counter clockwise to remove the packing nut. The stem may be tight. If it does not move, apply gentle pressure. Do not force it, as this can strip the threads on the valve body.

For a single handle cartridge tap, you may need a special tool. Many cartridges have a small hole or slot on the side. A cartridge removal tool or a small flat head screwdriver can be used to pull the cartridge out. Some cartridges are held by a clip or a retaining ring. Check for these fasteners before trying to pull the cartridge. If the clip is rusted, apply a penetrating oil and wait a few minutes.

Remove the handle by lifting it straight off the stem. For some models, the handle is keyed. If it does not lift, check for a small screw under the handle or cap. Some handles are held by a spring and a pin. Release the spring and remove the pin before lifting the handle.

Compare symptoms to likely causes

The table below maps common drip patterns to their probable origins. Use it to narrow the repair before buying parts.

Symptom	Likely cause	What to do
Steady drip when tap is off	Worn rubber washer or degraded O ring	Replace the washer or seal with an exact match size
Intermittent drip	Mineral scale on valve seat or cartridge	Clean the seat with a non abrasive pad, then reseat the washer
Drip from base of handle	Loose packing nut or damaged stem seal	Repack the stem or replace the stem seal assembly
Leak only on hot side	Corroded hot inlet valve or thermal expansion stress	Inspect hot supply valve, clean scale, check for corrosion
Constant drip after repair	Misaligned cartridge or damaged seat groove	Verify cartridge alignment, check for nicks in the seat
Drip after pressure surge	Stretched or cracked internal seal	Replace the cartridge or stem assembly, check supply pressure

Review the symptom carefully. A steady drip is usually a simple seal failure. An intermittent drip often means debris is preventing the valve from closing fully. If the drip comes from the base of the handle, the problem is in the packing, not the valve seat. This distinction is critical. If you replace a washer for a packing leak, the leak will continue. You must repack the stem or replace the stem seal.

If the leak is only on one side, check the supply line for that side. Sometimes the issue is not the faucet itself but the shutoff valve. If the shutoff valve is leaking, water may seep into the faucet body and cause a drip. Fix the shutoff valve first. Do not replace the faucet if the supply valve is the source of the leak.

Repair steps for compression stem taps

These older two handle taps rely on a rubber washer pressing against a metal seat. The most common failure is a flattened or cracked washer. Remove the stem, inspect the washer, and replace it if it shows any deformation. Check the metal seat for pitting or scale. If the seat is rough, lightly polish it with a fine abrasive pad until smooth.

Reinstall the new washer, ensuring it sits flat in its groove. Hand tighten the packing nut first, then tighten the stem nut by a quarter turn. Open the supply and test for leaks. If water still seeps around the handle, tighten the packing nut slightly. Do not over tighten, as this will strip the threads and cause a new leak.

When removing the stem, note the orientation of the washer. Some washers have a specific direction. Install the new washer in the same orientation. If the washer groove is worn, the new washer may not seat properly. Check the groove for nicks or deformation. If the groove is damaged, the stem may need to be replaced.

After installing the new washer, hand tighten the stem nut. Then tighten the packing nut by hand. The packing nut holds the stem in place and prevents water from leaking around the stem. If you over tighten the packing nut, the stem will bind and the handle will become hard to turn. This is a common mistake. Tighten until the stem moves smoothly but does not spin freely.

Open the supply valves slowly. Watch for leaks at the handle and at the base of the stem. If there is a leak, tighten the packing nut a quarter turn. Test the faucet by opening and closing the handle several times. This ensures the washer is seated correctly and the stem moves freely.

Repair steps for cartridge and ceramic disc taps

Single handle faucets use either a brass or plastic cartridge or a ceramic disc unit. Cartridge taps leak when the O rings inside the cartridge body degrade. Remove the cartridge, inspect the O rings, and replace them if they are hard or cracked. Clean the cartridge housing with a soft cloth to remove scale.

Ceramic disc taps rarely leak from worn discs. The problem is usually mineral buildup between the discs or a misaligned stem. Remove the cartridge, rinse the discs, and check for scratches. If the discs are scratched, replace the entire cartridge. Reinstall the unit with the correct orientation mark aligned to the housing slot.

When inspecting the cartridge, look for signs of wear. The O rings should be soft and flexible. If they are hard, cracked, or flattened, replace them. Some cartridges have a set of O rings that you can replace without buying a new cartridge. If the cartridge body is cracked or corroded, replace the entire cartridge.

For ceramic disc taps, the discs are made of a hard ceramic material. They do not wear out like rubber washers. However, they can get scratched or chipped. If the discs are scratched, water will leak past them. Replace the cartridge if the discs are damaged. If the discs are clean and undamaged, the issue may be mineral buildup.

Rinse the discs with a mild descaling solution. Use a soft cloth to remove any scale or debris. Do not use abrasive pads on the ceramic discs. This will scratch them and cause a leak. Check the housing for scale. Clean it with a soft cloth. If the housing is corroded, the faucet may need to be replaced.

When reinstalling the cartridge, check the orientation mark. Most cartridges have a small arrow or line that must align with the housing. If you install the cartridge in the wrong orientation, the faucet will not work correctly. It may drip or the handle may not close fully. Ensure the cartridge is seated fully in the housing before tightening the retaining clip or nut.

Prevention tips for long term reliability

Reduce water waste and extend the life of your taps with these simple practices. Inspect the drip pattern once a month. A small drip becomes a major leak if left unattended. Keep the supply valves accessible and free of corrosion. Avoid using the faucet as a tool for hanging items, as this twists the handle and strains the stem.

Use mild descaling solutions in hard water areas to prevent mineral buildup on valve seats. Do not use abrasive pads on the spout or valve components. If a drip persists after part replacement, stop and recheck the seat surface. A rough seat will destroy a new washer quickly.

Regular maintenance can prevent most leaks. Check the supply lines for corrosion and loose connections. Tighten them if necessary. Keep the shutoff valves accessible. If you have to turn them off for a repair, you should be able to find them quickly. Do not paint over or cover the shutoff valves.

In hard water areas, mineral buildup is a common cause of leaks. Scale can accumulate on the valve seat and prevent the washer from sealing properly. Use a mild descaling solution to remove the scale. Do not use harsh chemicals or abrasive pads. These can damage the metal seat and the rubber washer.

Avoid using the faucet as a tool. Do not hang towels, bags, or other items on the handle. This puts extra stress on the handle and the stem. It can loosen the handle screw and strain the internal mechanism. If you need to hang something, use a hook on the wall or a towel bar.

When to replace the entire faucet

Sometimes the repair cost exceeds the value of the fixture. If the faucet body shows extensive corrosion, the handle threads are stripped, or the valve seat is deeply pitted, replacement is the better option. Modern tap designs often use replaceable cartridges that last longer than older compression stems. When upgrading, choose a model with a standard cartridge type to simplify future repairs.

Check the supply connections when replacing the unit. Update any old washers at the shutoff valves. A new faucet on a failing supply line will leak at the base regardless of the internal repair. A clean supply connection protects the new fixture and prevents water damage to the cabinetry below.

Assess the condition of the faucet body. If the body is corroded or cracked, replacement is the only option. You cannot repair a damaged body. If the valve seat is deeply pitted, the new washer will not seal properly. You can polish a lightly pitted seat, but deep pitting requires a new seat or a new faucet.

If the handle threads are stripped, you can use a thread insert, but this is a temporary fix. If the handle threads are severely damaged, replace the faucet. A new faucet with a standard cartridge type will be easier to repair in the future. Avoid proprietary cartridges that are only available from the manufacturer. Standard cartridges are widely available and can be replaced quickly.

When replacing the faucet, check the supply connections. Update any old washers at the shutoff valves. If the shutoff valves are old or leaking, replace them as well. A new faucet on a failing supply line will leak at the base. A clean supply connection protects the new fixture and prevents water damage to the cabinetry below.

Remove the old faucet and clean the mounting surface. Check the mounting surface for corrosion or damage. If the surface is damaged, the new faucet may not seal properly. Use a new gasket or O ring to seal the faucet to the deck. Ensure the faucet is seated flat and tight.

Install the new faucet and connect the supply lines. Use new washers on the supply lines. Tighten the connections securely. Open the supply valves and test for leaks. Check the base of the faucet and the supply connections. If there is a leak, tighten the connection or replace the washer. A new faucet should not leak. If it does, the issue is likely in the supply connections or the mounting surface.