While certainly not the worst plumbing problem you could experience, finding your kitchen sink filled with water from the dishwasher can be inconvenient and unpleasant. If you’re currently dealing with your dishwasher backing up into your kitchen sink, you’re in luck—well, sort of. The following article underlines common reasons as to why this happens and what you can do to fix it.

Dishwasher Backing Up Into the Kitchen Sink

Your dishwasher drain and kitchen sink are connected to the same drainage line. This means that if there is a blockage within the main line, it can cause water to backup and overflow into your kitchen sink every time you run the dishwasher.

Typically, blockage in the kitchen sink drainage line can occur in one of four places: in the air gap, in the dishwasher drain, in the garbage disposal unit or in the sink itself.

Blockage in the air gap

An air gap is a device installed on the top of the kitchen sink to prevent contaminated water from draining back into the dishwasher. If blocked, however, it can leak the water coming from the dishwasher into the kitchen sink and cause the sink to overflow. Luckily, cleaning out a clogged air gap is easy. Simply remove the cover of your air clog, unscrew its protective cap and look inside it for any visible debris. Clean out the debris and reassemble the air gap.

Blockage in the dishwasher drain

Blockage in the dishwasher drain can also cause the dishwasher to back up into the kitchen sink. To determine if that’s the issue in your case, check out the bottom of your dishwasher. If the drain is blocked, it should have standing water. Remove any particles that may be causing the blockage. If there is no standing water, then the problem lies elsewhere.

Blockage in the garbage disposal unit

Garbage disposal units come with a drain plug. This drain plug should be removed at the time of installation to allow the unit to properly drain water from the dishwasher or sink. Sometimes, plumbers forget to remove the drain plug when installing a garbage disposal unit.  Check your garbage disposal unit to see if the drain plug has been mistakenly left on it. If the plug is still intact, remove it.

Blockage in the kitchen sink

Lastly, it’s possible that a clog in your kitchen sink is preventing water from your dishwasher to drain properly. To clear the blockage, use a heavy-duty drain cleaner or a drain snake.

If the problem still persists, and your dishwasher continues to back up into your kitchen sink every time you run it, contact your local plumber to fix the issue.

Monahan’s Plumbing is your trusted plumbing repairs and installation company in Cape Coral, FL. We specialize in clogged drains, toilet repairs, faucet repairs, garbage disposal unit repairs and other plumbing-related jobs. Our service areas include Cape Coral, Estero, Fort Myers, Sanibel Island, Captiva Island, Marco Island, Naples and Bonita Springs. Contact us to discuss your plumbing problems.