Leak Under Kitchen Sink

A leak under the kitchen sink is one of those leaks that are easy to spot. A puddle of water on the bathroom floor can’t be ignored easily. Even if you can see the damage, that doesn’t mean you should let it go unchecked. Your home’s structure can be severely impacted by any leak or plumbing issue. The worst aspect is that insurance doesn’t cover the full extent of the damage.

Having a working knowledge of kitchen sink leak detection is essential. Without the assistance of an expert, you may be able to fix some issues yourself.

How to locate a leak under kitchen sink?

The first step in learning how to remedy a kitchen sink leak is figuring out where it is. This is a list of the most common leaks:

Types of leaks

  • Drain leak
  • Damaged washers
  • Broken reverse osmosis system
  • Clogged or damaged pipes
  • Water supply leak
  • Faucet leak
  • Leaky P-Trap

Detailed instructions on how to find most of these leaks are provided below. Moreover, we’ll give you a few pointers on how to fix them – and whether or not you can do so on your own.

Drain Leak

This is the most common type of leak, and it’s relatively straightforward to find. Drain the sink once you’ve turned on the water. As water drains, look for any leaks that might be causing it. Most likely, you have a clogged drain or corroded or rusted parts within. (corroded valve seat regularly).

Plumber’s putty is used to seal the drain in most sinks. To prevent leaks, you should always keep this putty on hand. However, the putty can dry out with time.

When it was too thin, to begin with, it couldn’t hold on to that much water. You should call a specialist if any of these is the problem. Rather than replacing a putty, you should remove the drain entirely.


A loose nut may be the source of the problem in some cases. Before you assume anything else, make sure these nuts are tightened to the proper torque. It’s easy to replace loose nuts, but they might cause major leaking.

Water supply leak

Water supply leaks are another frequent cause of kitchen sink leaking or damage. Let the water run and try to drain it to find it, just like you would with a drain leak. If you see a puddle under the sink and the water isn’t draining.

The most common source of supply leaks is a faulty pipe or joint. Leaks that occur frequently are another sign that you have an issue with your supply. A cold and a warm water supply line are generally seen on a kitchen sink leaking.

(Secondary drain leaks)

If your sink has a separate sprayer, there may be the third connection as well. Water can drip from any of these connections if they break, corrode, or rust. These leaks frequently go unnoticed until they flood everything in the under-sink storage area. This is because the connections are often hidden from view.

As a result, there shouldn’t be any further leaks. You don’t always have to replace it; just make sure everything is properly adjusted before you start digging. Contact your local plumber if the leaks continue. There is little you can do if the problem is in the rusted pipes.

Faucet kitchen sink leaks

The majority of the time, you’ll be able to notice this leak without difficulty. When you turn on the water and see a puddle, you know you’ve found the source of the problem.

If you have a cartridge faucet, you’re more likely to leak this one. The faucet’s O-ring isn’t the most durable part. After a few years of regular use, the nut may become loose or worn out. Unfortunately for you, it’s not that difficult to replace the O-ring, and you can often do it yourself.

This eventually leads to the faucet leaking as a result of wear and tear. Although it is possible to replace the valve seat on your own in some cases, it is recommended that you seek the assistance of a mechanic.

It’s also a good idea to get the valve seat cleaned by an experienced plumber. If you do this, your kitchen sink will last longer than normal.

Faucet kitchen sink leaks

Leaky P-trap kitchen sink leaking

The sink is located under the kitchen counter. There’s a bent length of pipe over there. The P-trap is a term for something.

It stops unpleasant odors from escaping. If the leak is accompanied by foul odors, your P-trap is likely clogged.

All of these things obstruct the flow of water. Use a plunger or chemicals to unclog it. Hopefully, this will put an end to the faucet leaks or leaky sink.

In addition, if the trap is constructed of metal components, it will rust with time. If this is the case, you need to get a new one to prevent faucet leak or kitchen sink leaking.

This is again another task best left to a licensed professional plumber offering affordable plumbing services.

Leaky P-trap kitchen sink leaking

Damaged washer

Another common cause of a kitchen sink leak is a faulty or worn-out washer. Compression faucets, in particular, are notorious for this problem. Using a touchless faucet is also an excellent option.

Whenever the water faucet is turned on, a rubber washer is pressed against the valve seal.

Make sure the new washers are the same size as the old ones! Unless the replacement ones are thick enough, the sink could leak again and even prevent water supply connections, especially two water supply connections.

Damaged washer

Broken reverse osmosis system

Reverse osmosis water filtration systems are a cost-effective approach to ensure that your fresh drinking water is safe and pure and no loose water supply connection.

The problem is that these systems can fail, resulting in water puddles on the kitchen floor and in the cupboard.

Dripping hoses leading to the sink can be an indicator of their presence. The water dispenser or ice maker in your refrigerator is another common area to search for leaks.

Broken reverse osmosis system

Clogged or damaged pipes

Your sewage system is the most likely cause of a kitchen sink leak. Sewage pipelines have a lengthy lifespan.

As time goes on, we’ll all have to find new places to live. Although this is possible, it is unlikely.

Even though clogged pipes may just leak under the kitchen sink, it is feasible for them to do so. When the water is unable to flow through the system, resulting in leaks, this is done. The wall behind the sink is usually the first place to look for a water leak. If there are any water stains, pipes are the most likely culprits.

As a result, you should seek the assistance of a trained specialist. Don’t just meddle with pipes; this will just lead to more damage.

Clogged or damaged pipes

It’s time to figure out what to do about the kitchen sink leak!

Even if a little leak or trickle doesn’t appear to be a big deal, you should never put off fixing it. Water may cause serious damage to both your home and your health if it gets into the wrong places.

In addition to damaging the structure of the house, it can also cause the parquet to rise.

When in doubt about the source of the leaks, don’t be afraid to call in the experts. This is the only way to be sure that you did everything you could to avoid future issues.

It's time to figure out what to do about the kitchen sink leak!