Sink clogged (water drains slowly or not at all)

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

1. Check 1

   Stop adding water and observe the sink and nearby fixtures. Note whether one basin, both basins, the disposal, a nearby tub or toilet, or several fixtures are slow or backing up.

   Expected result: Record one sink only; both bowls; water rising in another fixture; gurgling or sewer odor; wastewater backing up; or water already pooling under the cabinet.

   Next step: Avoid using affected fixtures and arrange a plumber for multiple-fixture backup, sewage, recurring gurgling, or water damage. If only one sink is affected and no chemical has been used, continue with the visible debris and plunger checks.

   Stop if: Stop immediately for sewage backup, flooding, a ceiling or wall leak, contaminated water, or water near electrical equipment or a disposal connection.

   Why this matters

   Why: A single sink points more toward a local strainer, stopper, trap, or branch obstruction. Multiple fixtures or wastewater backup makes a downstream or main-line restriction more likely. Water under the cabinet adds a leak or trap-joint concern and is not solved by repeated plunging.

2. Check 2

   With standing water kept shallow and using gloves, inspect the visible strainer, stopper, and drain opening for hair, food, grease, or a small object. Remove only loose material that is plainly accessible; do not push it deeper or use a sharp tool.

   Expected result: Record a visible obstruction that lifts out; a stopper or disposal baffle that is not seated; a clear opening with slow flow; or an object that is stuck below the opening.

   Next step: Restore only the visible strainer or stopper position and add a small amount of water to observe flow. If the sink remains slow or blocked, use a plunger only when no chemical opener is present, or call a plumber.

   Stop if: Do not reach into an energized disposal, run it to clear a blockage, probe the drain with a sharp object, or push debris farther into the pipe.

   Why this matters

   Why: Debris at the opening can cause a local slow drain and may be removed without opening the plumbing. A clear opening with no improvement means the restriction may be in the trap or branch line; a stuck object should not be forced downward.

3. Check 3

   Only if no drain chemical has been used, place a sink plunger over the drain with enough water to cover the cup. Seal the overflow opening and, for a double sink, close the other drain; use controlled strokes without splashing.

   Expected result: Record that water begins draining; the level moves but returns; no movement occurs; the other basin rises; or dirty water or chemical odor splashes back.

   Next step: If flow improves, flush cautiously with ordinary water and monitor for recurrence. If it does not, stop and arrange plumbing service rather than increasing force, adding chemicals, or opening the trap without a safe plan.

   Stop if: Do not plunge after chemical opener was used, over a disposal that is energized, against a cracked fixture, or when sewage or chemical liquid can splash into eyes or skin.

   Why this matters

   Why: Improvement suggests a local, movable obstruction. Little or no movement, water transferring to another basin, or backup elsewhere makes a trap, branch, vent, or downstream restriction more likely. Splashback or chemical odor makes continued plunging unsafe.

4. Check 4

   From outside the cabinet, use a flashlight to observe the P-trap and drain connections for standing water, bulging, corrosion, dripping, a loose joint, or a visibly kinked or collapsed section. Do not loosen the trap or supply lines.

   Expected result: Record a dry, intact trap; water leaking at a joint; a damaged or corroded trap; a trap packed with visible residue; or no safe access under the sink.

   Next step: Place a container under a minor drip only if it can be done without touching contaminated liquid, stop using the sink, and arrange service for any leak, corrosion, standing water, or inaccessible trap. Do not rely on tightening a joint as a clog repair.

   Stop if: Do not unscrew a trap, cut piping, force slip nuts, or work beneath a sink where chemical opener, sewage, or electrical equipment is present.

   Why this matters

   Why: The P-trap is a common local clog location, but a leak or damaged fitting changes the job from simple flow clearing to containment and repair. Inaccessible, corroded, or chemical-contaminated piping should be opened by a plumber.

5. Check 5

   Ask whether any drain opener, bleach, acid, lye, baking-soda mixture, or other cleaner was poured into the sink, and check the label or container without handling spilled liquid. Note any fumes, heat, splashing, skin or eye contact, or breathing symptoms.

   Expected result: Record no chemical use; a chemical used recently; an unknown product in standing water; fumes or heat; or a person with eye, skin, throat, breathing, or swallowing symptoms.

   Next step: Do not add another product or plunge. Keep people away, ventilate only without spreading fumes, tell the plumber the product and time, and obtain immediate medical or poison-control help for exposure symptoms.

   Stop if: Stop and leave the area for strong fumes, eye or skin burns, breathing difficulty, collapse, or an unknown chemical spill; do not touch or neutralize the product yourself.

   Why this matters

   Why: No chemical history permits a mechanical plunger decision. A chemical in a blocked drain can remain concentrated and make plunging, trap opening, or mixing products hazardous. Exposure symptoms require poison-control or emergency guidance, not drain troubleshooting.

6. Check 6

   Prepare the plumbing service request with sink type, single or double basin, disposal presence, affected fixtures, onset, standing-water level, visible debris, plunger result, P-trap condition, leak or backup location, chemical history, and any water damage.

   Expected result: Confirm that the record contains observations only and that no trap, branch pipe, disposal, supply line, or chemical residue was disturbed or mixed.

   Next step: Arrange plumbing service when the drain remains slow or blocked after a safe visible check and plunger attempt, when multiple fixtures are affected, or when the trap is leaking, inaccessible, corroded, or chemically contaminated.

   Stop if: Stop homeowner troubleshooting when the next step requires trap or branch disassembly, a powered auger, disposal removal, chemical handling, or work near electrical equipment.

   Why this matters

   Why: The pattern helps a plumber distinguish an opening or local trap clog from a downstream or main-line restriction, a disposal or trap leak, a damaged fitting, or a chemical-contaminated drain.