The short answer
Common Causes of Drain Pipe Leaks
Most drain pipe leaks happen at the joints. The slip nuts that hold the pipes together can work loose over time, especially after temperature changes or minor bumps. A worn or missing washer inside the nut is another frequent cause, allowing water to seep past the seal.
Cracks in the pipe itself also cause leaks. Plastic pipes can crack if they are over-tightened or if something heavy presses against them. Metal pipes can corrode and develop pinholes. Look for water drips, mineral stains, or a musty odor under the sink to pinpoint the source.
How to Check the Drain Pipe Yourself
Start by placing a dry towel or a shallow pan under the pipes. Run water for a minute and watch where drips appear. Feel the slip nuts and the pipe surfaces with your fingers. A small drip may only need a gentle quarter-turn on the nut, but do not force it.
If the leak persists, take the pipe apart carefully. Remove the slip nuts and inspect the washers for cracks or flattening. Look at the pipe ends for rough edges or cracks. Replace any damaged parts with matching sizes from a hardware store. Reassemble and test again.
- Check the slip nuts at every joint
- Inspect washers for wear or cracks
- Look for cracks or corrosion on the pipe body
- Run water while you watch for drips
- Tighten nuts gently, not with tools
- Replace damaged parts with matching sizes
When to Call Water Damage Pros
If the leak is behind the wall or under the floor, or if you cannot stop it with simple repairs, you may need help. A hidden leak can soak drywall, cabinets, and subflooring without being obvious. Water damage can spread quickly, so act fast to limit the harm.
Local water damage pros can detect the leak's source and clean up any water that has already escaped. They use moisture meters and other tools to find hidden dampness. If the leak has caused damage, they can dry the area and help prevent mold from taking hold.
What to Do Right After a Leak
Turn off the water supply to the sink if you can. Look for the shutoff valves under the sink or the main valve for the house. If you live in Layton, keep the location of your shutoff valves written down so you can find them quickly in an emergency.
Wipe up standing water with towels and open the cabinet doors to let air circulate. Remove any items stored under the sink. If the leak has soaked the cabinet or floor, use a fan to help dry it. Do not ignore damp spots, as they can lead to mold growth.
Preventing Future Drain Leaks
Avoid using harsh chemical drain cleaners, as they can weaken plastic pipes over time. Use a mesh strainer to catch food scraps and hair, and clean the strainer regularly. Do not hang heavy items from the drain pipe, as the weight can stress the joints.
Check the drain pipe connections every few months. Give the slip nuts a gentle hand-tightening if they feel loose. Replace washers at the first sign of wear. A little routine attention can stop a small drip from becoming a major water damage event.
Talk to someone now
Water keeps spreading into floors and walls, so it is worth acting early. Calls are answered 24/7.
Call Now (801) 383-0232Frequently asked questions
Can I fix a drain pipe leak myself?
Yes, if the leak is at a joint and the pipe is intact. Tighten the slip nut gently or replace a worn washer. If the pipe is cracked or the leak is hidden, you may need a plumber or water damage help.
Why does my sink leak only when I use the drain?
That points to the drain pipe itself, not the supply lines. Water flows through the drain only when you run the sink, so the leak appears then. Check the joints and the P-trap for loose connections or cracks.
What if water has already damaged my cabinet?
Dry the area thoroughly and watch for swelling or staining. If the damage is extensive, the pros can help with cleanup and drying. Mold can grow within a day or two, so act quickly.