The situation
Illustrative example. Not a real job or customer.
A couple in a Fullerton condo starts the dishwasher after dinner. Halfway through, gray water with bits of food fills the sink basin next to the disposal. The faucet had seemed a little slow for weeks.
- They stop the dishwasher and switch off the disposal.
- They run the faucet alone; the basin drains slowly.
- They clean the countertop air gap cap; it is clear.
- They call a licensed plumber the next morning.
The dishwasher was working normally. A grease and food buildup in the trap arm and branch line could not handle the dishwasher's pumped flow.
What was checked and what it showed
| Check | Result | Meaning |
|---|---|---|
| Faucet alone | Slow drain | The shared drain is narrowed |
| Air gap | Clear | Not the cause |
| Dishwasher filter | Lightly dirty | Cleaned, not the cause |
| Drain hose | No kinks | Not the cause |
| Trap and trap arm | Grease and rice packed in | The cause |
How it was fixed
Cleared the trap
Removed packed food and grease.
Cabled the branch
Opened the narrowed section past the trap.
Ran a full cycle
Watched the sink during the dishwasher's drain to confirm the line kept up.
Questions the owners asked
- Is the dishwasher hose routed correctly?
- Does the condo's shared plumbing affect our drain?
- What should we change in how we use the disposal?
Why condos add a wrinkle
In a condo or townhome, the kitchen branch eventually joins piping shared with neighbors, and responsibility for that piping may sit with the association. In this example the clog was in the unit's own branch. If several units had been affected, the association would have been the first call.
Common questions
Did this really happen?
No. It is a hypothetical example written for this guide.
Should the dishwasher have been replaced?
No. It was doing its job; the drain was the problem.
Who handles shared drains in a condo?
Usually the association handles common piping, but check your association documents.
General information for Fullerton, not a quote or professional advice. In an emergency, call 911.