American Standard sink faucet keeps dripping: What to Check and What to Do Next

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

1. Check 1

   Dry the spout, handle, faucet deck, and cabinet area. With the faucet fully off, observe where the first new drop appears and whether it occurs only from the spout, around a handle or base, at the pull-out hose, or at a supply connection below the sink.

   Expected result: The spout drips with the faucet off; water appears around a handle or base; or water begins at a hose, shutoff, threaded fitting, or supply line.

   Next step: Use the matching branch rather than ordering a generic cartridge. Keep the area dry and record a photograph of the leak location and whether it is hot-side, cold-side, or both.

   Stop if: Stop if water is spraying, reaching electrical equipment, the faucet body is cracked, or the leak rate is increasing.

   Why this matters

   Why: A spout drip points toward an internal shutoff valve, cartridge, seat, or seal. A handle or base leak may involve an O-ring, cartridge seal, or body joint. A below-sink leak is more likely an external connection or hose issue and can damage cabinetry even if the spout is dry.

2. Check 2

   Place a towel or container under the leak and identify the accessible hot and cold shutoff valves below the sink. Close only the affected stop if it is clearly labeled and turns normally; if both sides feed the leaking faucet or a stop will not close, use the home's main water shutoff according to local plumbing guidance.

   Expected result: The leak stops when one supply is closed, stops only when both are closed, continues despite the faucet stops, or the shutoff itself leaks or will not move.

   Next step: Leave the affected supply closed, protect the cabinet, and prepare the exact faucet model information. If the stop leaks, will not close, or the main shutoff is needed, arrange licensed plumbing service before disassembly.

   Stop if: Stop for a seized or corroded valve, active spray, flooding, water near electrical equipment, or any need to remove a pressurized fitting.

   Why this matters

   Why: A one-sided stop isolates a hot- or cold-side valve or supply issue. A spout drip that stops only when both supplies are closed still leaves the faucet's internal valve as a possibility. A failed or seized stop increases the risk of flooding during repair.

3. Check 3

   Identify the faucet configuration and model without dismantling it: count handles, note whether it is a single-hole, centerset, or widespread layout, and read the model marking or installation paperwork if available. Compare the manufacturer's model-specific installation guide or repair-parts diagram before touching a handle, retaining nut, cartridge, or seal.

   Expected result: The faucet is single-handle or two-handle, the model is confirmed, the model cannot be found, or the available diagram does not match the faucet's handle and body.

   Next step: Use the confirmed model's instructions or give the model and photos to a plumber or manufacturer support channel. Do not buy a part based only on the American Standard name, handle style, or a generic cartridge description.

   Stop if: Stop if the model cannot be confirmed, a part diagram conflicts with the installed faucet, the handle is seized, or repair would require force or cutting.

   Why this matters

   Why: Single-handle and two-handle faucets can use different valve assemblies, and even similar-looking collections can have different parts. An unidentified or mismatched diagram makes a guessed cartridge or washer unsafe and likely to create another leak.

4. Check 4

   With the water supply isolated and the cabinet protected, inspect only visible fittings, flexible hoses, faucet-base seams, and the aerator for debris or damaged seals. Do not remove a cartridge or valve unless the exact model guide clearly gives that procedure and the supply is fully off.

   Expected result: A supply nut, hose, base seam, or visible gasket is wet; the aerator is obstructed but the body is dry; or all external surfaces are dry while the spout continues to drip.

   Next step: For a confirmed loose connection, follow the exact manufacturer instruction without overtightening; otherwise keep the water isolated and arrange plumbing service for internal valve, cartridge, or seal work. Reopen a supply slowly only after the repair procedure is complete and the area can be watched.

   Stop if: Stop for a cracked body, damaged hose, a fitting that spins or will not seal, active leakage after a normal gentle correction, or any need to force internal parts.

   Why this matters

   Why: A wet external connection can be the leak source and needs the correct model or fitting procedure, not an internal cartridge by default. An obstructed aerator can affect flow but does not explain a persistent valve drip. Dry external surfaces with a spout drip make the internal shutoff assembly more likely.

5. Check 5

   After a model-specific repair or professional visit, reopen the isolated supply slowly while watching the spout, handle, base, hose, and shutoff connections. Operate each handle through its normal range and leave the faucet off long enough to check for a returning drip.

   Expected result: The faucet remains dry when off, drips only after movement, leaks immediately at a connection, or the original drip returns after a short period.

   Next step: Close the supply again for any returning leak, document the exact location and timing, and arrange licensed plumbing service rather than repeatedly tightening or replacing parts by guesswork.

   Stop if: Stop immediately for spraying water, cabinet damage, a cracked faucet body, or a supply stop that cannot isolate the leak.

   Why this matters

   Why: A dry complete cycle supports that the repair addressed the leak. A drip only during movement suggests a handle or dynamic seal issue; an immediate connection leak suggests assembly or fitting trouble; recurrence suggests a mismatched, damaged, or worn internal part or a faucet-body problem.