A faucet dripping when water is off usually has a failed washer, cartridge, ball seal, or ceramic-disc seal that no longer blocks pressurized water. A drip from the spout indicates an internal shutoff failure; water around the handle usually indicates an O-ring, packing, or stem-seal leak. The location determines the repair.
Key Facts at a Glance
- A continuous spout drip means the faucet’s internal valve is allowing water past its closed sealing surface.
- A leak around the handle usually requires an O-ring, packing-nut, or stem-seal repair rather than a spout valve repair.
- Compression faucets commonly need a rubber washer; cartridge, ball, and ceramic-disc faucets usually need a model-specific replacement part.
- Water pressure above 80 pounds per square inch, or PSI, can shorten seal life and worsen intermittent dripping.
- Most sink-faucet repairs take 30-60 minutes and cost approximately $5-$50 when the correct part is available.
- A faucet body with pitted metal, unavailable parts, or seized supply valves often makes replacement or professional service more practical.
What Does a Faucet Dripping When Water Is Off Mean?
A faucet that drips after shutoff has lost the watertight barrier between the pressurized supply line and the spout. The handle can be fully closed while a damaged washer, scratched cartridge, distorted seal, or contaminated ceramic disc still leaves a microscopic water path.
The first diagnostic distinction is location. Water falling from the spout means the valve is not closing completely. Water emerging at the handle stem, escutcheon, or faucet body means pressurized water is escaping around the mechanism rather than through the intended outlet.
A few drops can remain inside the spout after use. That residual water normally stops within seconds or a few minutes. A drip that continues for hours is an active supply-side leak, not leftover water.
Why does water pass through a closed faucet?
A faucet closes by pressing or aligning a sealing surface against an opening. Rubber washers compress against valve seats, O-rings seal cartridge edges, ball-faucet springs push rubber seats upward, and ceramic discs align two precisely machined openings.
Mineral scale, grit, corrosion, worn rubber, and excessive torque interfere with that contact. A small scratch across a cartridge or valve seat can create a continuous leak path even when the handle feels normal.
U.S. Environmental Protection Agency WaterSense states that “the average household’s leaks can account for nearly 10,000 gallons of water wasted every year.” That figure includes all household leaks, not one faucet, but it explains why a persistent drip deserves prompt attention.
Which Faucet Mechanism Is Leaking?
Faucet type predicts the failed part and the disassembly method. Identify the handle movement before buying parts, because a cartridge for a Moen faucet, for example, will not fit a Delta or Kohler mechanism with similar external styling.
| Faucet type | External identification | Closed by | Typical failed component |
|---|---|---|---|
| Compression | Two handles, several turns from open to closed | Threaded stem compresses washer | Rubber washer, valve seat, stem O-ring |
| Cartridge | One or two handles, quarter-turn or smooth rotation | Cartridge ports and perimeter seals | Cartridge, O-rings, retaining clip |
| Ball | Single lever over rounded dome cap | Slotted ball, rubber seats, springs | Seats, springs, ball surface |
| Ceramic disc | Single lever, smooth quarter-turn control | Two polished ceramic discs | Disc inlet seals, contaminated discs |
How can you identify the failed part before disassembly?
Turn the handle slowly and note its resistance. A compression handle becomes progressively tighter over multiple rotations. A cartridge handle usually moves through a limited arc, while a ball faucet uses a lever over a rounded cap. A ceramic-disc handle feels smooth and controlled, often with separate vertical volume and horizontal temperature movement.
Record the brand, faucet model, handle configuration, and number of mounting holes under the sink. Photograph the assembled faucet and each layer during disassembly. Those records matter when a retaining clip, orientation tab, or decorative sleeve is difficult to reinstall.
The manufacturer’s model number is more reliable than visual matching. Look behind the escutcheon, on the faucet body below the sink, or on the original installation paperwork.
Where Is the Water Escaping?
Leak location narrows the diagnosis faster than faucet age or brand. Dry the faucet completely, place a tissue around the handle base and spout, then observe the first wet point while the supply valves remain open.
| Leak location | Most likely cause | First repair check | Typical difficulty |
|---|---|---|---|
| Spout tip, continuous | Washer, cartridge, ball seal, disc seal | Isolate hot and cold, then remove valve | Low to moderate |
| Handle base | Stem O-ring, packing nut, cartridge seal | Tighten packing nut slightly, inspect O-ring | Low to moderate |
| Faucet body seam | Cracked casting or internal body corrosion | Inspect body with supply isolated | Moderate to high |
| Hose or pull-out connection | Loose fitting, worn gasket, damaged hose | Check connection beneath sink | Low |
| Supply-line connection | Loose nut or failed cone gasket | Dry and observe flexible connector | Low |
| Escutcheon or wall penetration | Shower valve trim or piping leak | Remove trim only after isolating supply | Moderate to high |
A spout drip and a handle-base leak can occur together. Replacing the cartridge may stop the spout leak but leave a damaged body O-ring untouched, so test both locations after reassembly.
Could Water Pressure Be the Real Cause?
Water pressure above 80 PSI can force water past marginal seals and accelerate faucet wear. A pressure-related drip often appears intermittently, becomes stronger when another fixture operates, or returns soon after a new cartridge is installed.
Attach a pressure gauge to an outdoor hose connection or washing-machine connection, with fixtures closed. Read the static pressure after the plumbing has been idle for several minutes. A reading above 80 PSI warrants investigation of the home’s pressure-reducing valve, or PRV, and possible thermal-expansion control.
| Pressure reading | Interpretation | Recommended action |
|---|---|---|
| 40-60 PSI | Typical residential operating range | Repair the faucet normally |
| 61-79 PSI | Elevated but commonly serviceable | Repair and monitor recurrence |
| 80 PSI | Upper commonly accepted limit | Test again and inspect PRV |
| 81-100 PSI | Excessive static pressure | Have PRV and expansion control checked |
| Over 100 PSI | Potential fixture and piping stress | Shut down nonessential use and call a plumber |
Pressure does not excuse a visibly worn seal. A faucet that drips at 55 PSI still needs repair, while a faucet that repeatedly fails at 95 PSI needs both seal replacement and pressure correction.
How Do You Repair a Dripping Sink Faucet?
Most sink-faucet repairs require shutting off both supplies, protecting the drain, removing the handle, extracting the valve mechanism, replacing the failed part, and testing before final assembly. Allow 30-60 minutes for a first repair, and let the exact manufacturer part determine success.
Before you start
| Requirement | Typical specification |
|---|---|
| Time | 30-60 minutes for a first attempt |
| DIY parts cost | $5-$50, depending on washer or cartridge |
| Tools | 4 tools: screwdriver, hex key, adjustable wrench, needle-nose pliers |
| Materials | 1 replacement washer, O-ring, cartridge, or seal kit |
| Protection | 1 towel, 1 drain cover, 1 small container |
| Prerequisite | Working hot and cold shutoff valves |
Do not begin if the supply valves are corroded, the faucet is mounted to brittle old piping, or the repair is part of a shower valve inside a wall. Those conditions increase flood and property-damage risk.
Step 1: Shut off both water supplies
Turn the hot and cold angle stops clockwise until they stop, without forcing them. Open the faucet fully and let the remaining water drain into the basin.
You will know the supply is isolated when the faucet produces no continuing flow after several seconds. If water continues at full pressure, close the main shutoff and do not loosen the faucet’s retaining nut.
The common mistake is relying on the handle alone. A closed handle does not isolate the supply line.
Step 2: Cover the drain and document the assembly
Place a towel over the drain opening and set a small container nearby for screws and clips. Take close photographs of the handle, retaining hardware, cartridge orientation, and seal placement.
You will know the workspace is ready when every small component has a visible storage location. A lost set screw can delay a ten-minute repair longer than the leak itself.
The common mistake is using a thick towel that hides parts. Use a thin basin towel and a separate container.
Step 3: Remove the handle
Find the decorative hot/cold cap or side plug. Pry it up with a thin flat screwdriver, then loosen the exposed Phillips or hex-head set screw and lift the handle straight off.
Protect chrome, brushed nickel, and matte-black finishes with painter’s tape over wrench jaws. If the handle is seized, apply penetrating oil around the stem and wait 10-15 minutes rather than twisting the faucet body.
You will know the handle is free when the stem or cartridge top is exposed without side-to-side force. The common mistake is prying against the finished faucet body and leaving permanent marks.
Step 4: Extract the valve mechanism
Remove the retaining nut, bonnet, or clip according to the faucet design. Cartridge faucets may have a U-shaped brass or steel clip that must come out before the cartridge can be lifted.
Pull a cartridge as straight as possible. A cartridge-puller tool is safer than pliers when mineral scale has bonded the part to the housing. For a ball faucet, remove the dome cap and cam before lifting the ball, seats, and springs.
You will know the mechanism is ready for inspection when it comes out without bending the faucet body. The common mistake is rotating a cartridge that has an orientation tab or forcing it against a retaining clip.
Step 5: Replace the sealing component
Match the failed component by brand and exact dimensions. Compression faucets usually receive a new bottom washer and sometimes a new valve seat; cartridge faucets generally need a complete cartridge or manufacturer seal kit rather than a generic O-ring.
Clean loose mineral deposits from the valve cavity with a nylon brush and a cloth. A small amount of silicone plumber’s grease on compatible O-rings helps installation, but petroleum jelly can damage some rubber compounds.
You will know the replacement is correct when the cartridge tabs, ports, or stem flats align exactly with the housing. The common mistake is installing a visually similar part that is the wrong height or port orientation.
Step 6: Reassemble and test slowly
Reinstall the mechanism, retaining clip or nut, handle, and decorative cap. Open each supply valve slowly while watching the faucet body and connections, then operate the handle through its full range.
Leave the handle partly open during the first pressurization so trapped air can escape. Run cold and hot water for 30-60 seconds to flush loose debris, then close the faucet and watch the spout for at least five minutes.
You will know the repair worked when the spout remains dry and no tissue around the handle base becomes wet. The common mistake is tightening until resistance feels extreme, which can crack plastic cartridges or pinch O-rings.
How Do Compression, Cartridge, Ball, and Disc Repairs Differ?
Repair method depends more on the valve mechanism than on whether the faucet is in a kitchen or bathroom. Compression repairs are often inexpensive and straightforward, while cartridge and ceramic-disc repairs depend heavily on exact model compatibility.
| Mechanism | Common part price | Typical repair time | Replace faucet when |
|---|---|---|---|
| Compression washer | $2-$8 | 20-40 minutes | Seat is deeply pitted or stem is corroded |
| Cartridge | $15-$45 | 30-60 minutes | Cartridge is discontinued or body is damaged |
| Ball repair kit | $10-$35 | 30-60 minutes | Ball surface is scored or dome is cracked |
| Ceramic-disc cartridge | $20-$80 | 30-75 minutes | Ceramic body or faucet casting is cracked |
Compression faucets can often be rebuilt with a washer, screw, and valve-seat repair. A rough valve seat will cut a new washer, so replacing only the rubber is a short-term fix when the metal surface is pitted.
Cartridge faucets are less forgiving of generic parts. A replacement that is one millimeter too tall can prevent the retaining clip from seating or leave the valve partly open.
Ceramic-disc faucets rarely benefit from aggressive sanding. Polished ceramic surfaces can be permanently damaged by abrasive tools, so replace the cartridge or use the manufacturer’s cleaning procedure.
Why Does the Faucet Drip Only After Use?
A faucet that drips briefly after use may contain residual water in the spout, aerator, or pull-out hose. A drip that continues beyond several minutes, returns every time, or worsens under pressure indicates a valve or seal problem.
Remove and rinse a clogged aerator if water hangs at the outlet after shutoff. Mineral deposits can hold a small volume of water and make a faucet appear to leak, although they do not usually produce a steady drop every few seconds.
Intermittent dripping can also result from debris moving through the supply line. After replacing a cartridge, flush each supply for 30 seconds with the aerator removed, then reinstall the aerator and retest.
A temperature-related drip deserves extra attention. Heated water can expand in a closed plumbing system, raising pressure temporarily through thermal expansion, especially where a check valve or backflow preventer prevents expansion toward the supply main.
What If the Under-Sink Shutoff Valve Will Not Close?
A stuck angle stop should not be forced with a wrench. The valve stem or packing can break, and the resulting leak may require the home’s main water shutoff or emergency plumbing service.
Try turning the handle gently while supporting the valve body with your other hand. If the handle spins without stopping the water, or if the valve begins leaking around its stem, stop and close the main shutoff.
| Shutoff condition | Safe next action | Do not do |
|---|---|---|
| Handle turns normally, water stops | Proceed with faucet repair | Leave valve half-open |
| Handle is stiff | Apply gentle hand pressure only | Use locking pliers |
| Water leaks at stem | Close main supply | Tighten aggressively |
| Valve will not isolate flow | Call a plumber or use main shutoff | Remove faucet cartridge under pressure |
A renter should report a failed shutoff valve and dripping faucet to the landlord before disassembly. A homeowner should know the main shutoff location before attempting any pressurized plumbing repair.
When Should You Repair or Replace the Faucet?
Repair a faucet when the body is sound, the model is supported, and the replacement part costs less than approximately one-third of a comparable new fixture. Replace the faucet when corrosion, repeated failures, unavailable parts, or mounting damage makes another repair uncertain.
| Decision factor | Repair is preferable | Replacement is preferable |
|---|---|---|
| Fixture age | Under 10 years | Over 15 years with recurring failures |
| Part availability | Manufacturer cartridge costs $15-$45 | Discontinued cartridge costs $40-$100 |
| Body condition | Smooth valve cavity, no cracks | Pitting, cracks, or damaged threads |
| Labor scope | One seal or cartridge | Multiple leaks and seized hardware |
| New fixture cost | Repair costs under $50 | New faucet costs $60-$300 |
A new faucet does not guarantee a better repair outcome if the supply valves, countertop holes, or shutoff connections are also deteriorated. Measure the mounting-hole spacing and check connector lengths before purchasing a replacement.
High-quality ceramic-disc faucets can reduce routine washer replacement, but ceramic discs still fail when grit enters the valve. They are not a substitute for filtration in a home with recurring sediment.
What Does Faucet Repair Cost?
A typical DIY repair costs $5-$50, while a standard professional faucet repair commonly costs $150-$350 before unusual access, emergency timing, or concealed plumbing increases the bill. Full faucet replacement generally adds the fixture price and may require new supply connectors.
| Service choice | Typical parts cost | Typical labor or total | Typical duration |
|---|---|---|---|
| DIY compression washer | $2-$8 | $5-$20 total | 20-40 minutes |
| DIY cartridge replacement | $15-$45 | $20-$60 total | 30-60 minutes |
| Plumber seal or cartridge repair | $10-$80 | $150-$350 total | 30-90 minutes |
| Plumber faucet replacement | $60-$300 fixture | $250-$600 total | 1-3 hours |
Costs vary by region, access, brand, and minimum service charges. A bathtub or shower faucet may cost more because the shutoff is inaccessible, the trim is corroded, or the valve is installed behind finished wall material.
How Do Situations Differ for Other Faucets?
Kitchen, bathroom, outdoor, and bathtub faucets share the same sealing principle but differ in access and risk. A sink faucet is usually the best DIY candidate because both supply valves are visible and the replacement parts are accessible.
An outdoor hose bib that drips when off may need a new stem washer, packing, or complete frost-free sillcock. Shut off the interior supply first, because an outdoor faucet can discharge water into a wall cavity when its vacuum-breaker or stem assembly fails.
A bathtub or shower faucet that drips from the spout often has a cartridge or pressure-balancing valve problem. Do not assume the visible trim is the shutoff; many shower valves require a main-house or integral service stop.
Pull-out and pull-down kitchen faucets add hose, weight, quick-connect, and spray-head failure points. If water appears under the sink only while the faucet is operating, inspect the hose and quick-connect before replacing the cartridge.
Common Mistakes and How to Fix Them
- Loosening the retaining nut before isolating water. Close both angle stops, open the faucet, and confirm that pressure has fallen.
- Installing a replacement backward. Compare cartridge ports and orientation tabs with the original before tightening the retainer.
- Overtightening the packing nut. Tighten in small increments until seepage stops; excessive force can crush the stem seal.
- Cleaning with abrasive tools. Use a nylon brush on valve cavities, and avoid sanding ceramic discs or finished surfaces.
- Ignoring a rough valve seat. Replace or resurface a damaged seat before fitting a new compression washer.
- Testing only the spout. Dry the handle base and supply connections, then observe them during and after operation.
One practitioner rule matters especially: never use the faucet handle as leverage against the faucet body. The body can rotate in the countertop, damaging supply lines beneath the sink.
Another counterintuitive point is that a tighter handle does not always mean a better seal. Excessive compression can deform a washer, distort a cartridge, or make a ceramic-disc mechanism bind before it actually closes.
When Is DIY the Wrong Choice?
Call a licensed or qualified plumber when the main shutoff cannot isolate the line, the supply valve leaks, the faucet is connected to old rigid piping, or the leak enters a wall or cabinet base. Professional help is also appropriate when a shower cartridge is seized or the correct replacement part cannot be identified.
Stop immediately if water reaches electrical equipment, the cabinet floor swells, or a concealed leak is suspected. The cost of a service call is usually lower than repairing water-damaged cabinetry, flooring, drywall, or electrical components.
FAQ
Can a dripping faucet increase my water bill?
Yes. A continuous drip wastes water, although the exact amount depends on drop size and frequency. A commonly cited estimate places one drop per second at roughly 3,000 gallons per year, but a thin stream wastes far more. Measure the drip rate for one minute and repair persistent leakage promptly.
Is a faucet drip an emergency?
A spout drip is rarely an immediate emergency if the drain is open and the cabinet remains dry. A leak from the handle, supply connection, wall, or cabinet floor requires faster action because water can damage surrounding materials. Close the local shutoff or main valve if the leak accelerates.
Can vinegar fix a dripping faucet?
Vinegar can loosen mineral deposits on removable parts and aerators, but vinegar cannot restore a split washer, scratched cartridge, failed O-ring, or pitted valve seat. Use it only for compatible scale removal, rinse the parts afterward, and replace the sealing component when damage is visible.
Why is my new cartridge still dripping?
A new cartridge can drip when installed backward, left unsecured, contaminated by grit, or paired with excessive water pressure. Remove the aerator, flush the supply lines for 30 seconds, verify orientation and retaining-clip placement, then test static pressure if the leak returns.
How long should a faucet repair last?
A correctly matched washer or cartridge can last several years, but lifespan depends on water quality, pressure, usage, and faucet construction. Repeated failure within weeks suggests a rough valve seat, sediment, excessive pressure, incorrect part, or corrosion in the faucet body.
Should a renter fix a dripping faucet?
A renter should normally notify the landlord or property manager, particularly when the shutoff valve is stiff, the faucet is wall-mounted, or water is reaching cabinetry. A renter may clean an aerator or close an accessible valve, but should not disassemble a fixture without permission when lease terms assign plumbing repairs to the owner.
The Bottom Line
A faucet dripping when water is off is usually a failed internal seal, not a problem with the handle position itself. Identify whether the leak comes from the spout or handle, determine the faucet mechanism, isolate the water, and replace the correctly matched washer, cartridge, ball seal, or ceramic-disc component.
Repair is usually sensible when the faucet body is sound and parts cost $5-$50. Replace the fixture or call a plumber when corrosion, excessive pressure, seized shutoffs, concealed plumbing, or repeated failures make a reliable DIY repair unlikely.