Faucet dripping supply stops work — supply stops work

Use only checks that match the exact appliance or system and its official guide.

1. Check 1

   With the faucet handle or handles fully off, dry the spout, handle area, faucet base, flexible hoses, threaded fittings, and each supply stop with a paper towel and observe where the first new moisture appears; do not reach into energized appliances or use a tool on a wet connection.

   Expected result: The first moisture forms at the spout, around a handle or base, at a hose or threaded fitting, or at the body or stem of a supply stop.

   Next step: Photograph the location and continue with the isolation check. If water is accumulating under the sink, at a stop, or at a hose, keep the cabinet clear and arrange plumbing service rather than tightening blindly.

   Why this matters

   Why: A spout drip with the faucet off makes an internal cartridge, stem, seat, or seal issue more likely. Moisture under the sink or at a hose, fitting, or stop points to the supply side and may continue regardless of the handle position.

2. Check 2

   Locate both hot and cold supply stops under the sink or at the accessible faucet connection, turn each clockwise gently to its closed position, then open the faucet handle to release pressure; do not force a corroded, seized, or leaking stop.

   Expected result: The flow drops to a brief release and stops, only one side stops, or water continues steadily after both stops appear closed.

   Next step: Proceed only with a model-specific faucet procedure after isolation is proven. If either stop fails to isolate the faucet, stop and use the main shutoff only if known and safely accessible, then call a plumber.

   Why this matters

   Why: A brief release followed by no flow supports that the fixture is isolated. Continued flow means a stop is not closing, the wrong valve was used, or another supply path remains; disassembly could cause an uncontrolled leak.

3. Check 3

   With both supply stops closed and the faucet open, watch the spout and the under-sink connections for several minutes and note whether the drip ends, slows, or continues at the same rate; keep a container below the outlet without placing hands near a leaking connection.

   Expected result: The spout stops after residual water drains, the spout continues to drip while the supply side stays dry, or the under-sink hose or stop continues to wet.

   Next step: For a confirmed internal drip, record the faucet model and handle type before selecting a conditional repair part. For a supply-side leak, leave the stop closed if it holds and arrange service; if it does not hold, shut off the main supply and call a plumber.

   Why this matters

   Why: A short tail that ends is residual water. A continuing spout drip after verified isolation supports a faucet-internal sealing problem. Continued under-sink moisture identifies a supply-side leak that needs isolation and may need a stop, hose, or fitting repair.

4. Check 4

   Identify whether the faucet is single-handle or two-handle and record its make, model, cartridge or stem markings, and whether the drip is from the spout, handle, or base; do not remove the handle or retaining parts until the supply is verified off.

   Expected result: The model is known and the leak location matches the manufacturer's spout or base symptom, or the model is unknown and the visible design could accept several different internal assemblies.

   Next step: Use the manufacturer's identification guide or a plumber to identify the correct part. If the model cannot be identified, keep the fixture isolated when practical and do not force a generic cartridge into the body.

   Why this matters

   Why: Faucet cartridges, stems, seats, and seals are not universal. A model-specific symptom and part diagram can narrow a replacement; a guessed part can leave the valve unable to close or create a new leak.

5. Check 5

   Test each supply stop's behavior without disassembling it: observe whether the handle closes normally, stops at the end of travel, leaks around the stem, or leaves water flowing when the faucet is open; do not use pliers or a wrench to overcome resistance.

   Expected result: Both stops close and remain dry, one stop is stiff or will not close, a stop leaks at its stem or connection, or the main shutoff is needed to stop the flow.

   Next step: Leave a reliable stop closed if needed and arrange a plumber for a failed stop. If water cannot be controlled locally, use the known main shutoff and seek prompt help; do not remove the supply stop yourself while the line is pressurized.

   Why this matters

   Why: Working, dry stops support a controlled faucet repair. A stop that is seized, leaking, or unable to isolate the line is itself a plumbing fault and makes faucet disassembly unsafe until the water can be controlled upstream.

6. Check 6

   After isolation is proven, inspect the cabinet and nearby wall or floor for swelling, staining, mildew, or water reaching electrical equipment, and note whether the drip rate changes when the faucet is moved; do not operate electrical equipment that has become wet.

   Expected result: The cabinet is dry with a small spout drip, or there is cabinet damage, standing water, a supply leak, water near an outlet or appliance, or a drip that becomes a stream when the handle moves.

   Next step: Keep the water isolated, remove only loose dry items from the area, and arrange prompt plumbing service. For water near electrical equipment, keep clear and have the appropriate electrical professional assess it before use.

   Why this matters

   Why: A small isolated spout drip can usually wait only for a controlled model-specific repair. Cabinet damage, a supply leak, uncontrolled flow, or water near electricity raises the chance of property damage or a shock hazard.