Commercial Faucet Dripping: Cartridge and Washer Troubleshooting
A faucet that drips after shutoff usually has a worn cartridge, stem washer, seat, seal, or debris preventing a seal. Identify the faucet type before disassembly.
Find the first drop before choosing a part
| Symptom | Possible cause | Useful check |
|---|---|---|
| Continuous drip from the outlet after shutoff | Valve/cartridge, washer or seat not sealing | Confirm persistent dripping rather than residual water; identify the faucet model before ordering. |
| Water around a handle | Stem/cartridge seal or connection in that area | Dry the surface and watch for the first fresh water. The service part depends on the design. |
| Water around a swivel-spout base | Possible spout seal, or water tracking down from above | Observe normal spout positions and consult the exploded diagram before assuming an O-ring. |
| Water underneath the sink | Supply connection, faucet body or drain leak | Dry accessible joints and locate the first drop. A drain leak needs a different repair. |
Tools and preparation
Bring these
- Adjustable wrench
- Magnetic parts tray
- Shop towels
- Exact model manual and phone for documentation
Before touching anything
- Confirm the exact location and complaint.
- Photograph labels, settings, fault codes, and the original condition.
- Determine whether the failure affects one item or several nearby items.
- Know how to safely isolate the system if the task requires it.
Step-by-step checks
Identify manufacturer and faucet style
Photograph the brand, handle arrangement, and cartridge identification; a similar-looking cartridge is not proof of compatibility.
Shut off hot and cold stops
Close both fixture stops gently and confirm flow stops when the faucet is opened; do not dismantle a faucet with a passing or seized stop.
Open faucet to relieve pressure
Leave the faucet open to release trapped pressure, protect the drain against lost parts, and catch residual water.
Remove handle and trim carefully
Follow the model's handle and retaining-clip sequence; place parts in order and do not pry against the ceramic sink.
Inspect cartridge, stem, and seals
Check the cartridge and sealing seats for damage or grit. Install the specified part, restore water slowly, and verify shutoff and dry joints through several hot/cold cycles.
Routine fixes that make sense here
- Clean debris from sealing surfaces
- Replace the exact cartridge or stem kit
- Reassemble and test both shutoff and handle leakage
Common mistakes
- Replacing parts before proving the failure.
- Changing several settings or components at once.
- Failing to photograph the original condition.
- Ignoring whether nearby equipment has the same symptom.
- Crossing into electrical, refrigerant, life-safety, structural, or plumbing work beyond training.
When to stop and hand it off
- Supply stops do not hold
- Faucet body is cracked
- Cartridge is seized badly enough to risk breaking the body
Frequently asked questions
Does every drip need a new cartridge?
No. Distinguish an outlet drip from a handle leak and water below the sink. Compression faucets may use a washer and seat, while other designs use cartridges. The installed model’s parts diagram determines the repair.
What if the shutoff will not stop the water?
Keep the faucet assembled and have authorized personnel isolate the supply. Do not open pressurized components or force a seized stop.
How do I check the repair?
Restore supply slowly as the manual directs. Dry and inspect connections, test hot and cold without scald exposure, then recheck the outlet with the faucet off. Record persistent dripping or fresh moisture.
Can I use a cartridge that looks the same?
Appearance is insufficient. Record brand and model, then confirm the part number, orientation and design in the manual. Never force a part that does not seat naturally.
Related BuildingWrench guides
BuildingWrench provides general educational information for commercial-facility maintenance. Manufacturer instructions, applicable codes, site procedures, and required trade qualifications always take priority.
Tools that fit this task
Use what you already own first. These affiliate links may earn a commission at no extra cost to you. Confirm model and compatibility before buying.
Smooth jaws help protect fittings; verify jaw opening fits the specific fitting.
Keep removed screws and clips organized away from the drain.
Dry accessible surfaces so fresh leakage is easier to identify; not for hazardous spill cleanup.
Diagnostic references: Kohler: leaking from the spout; Moen: leaking around the base. These references do not replace instructions for the installed faucet.