Sediment Buildup

Over time, mineral deposits and other sediment can accumulate in the toilet tank and pipes. This buildup can interfere with the proper functioning of the flush valve and other components, causing noises like trickling or dripping after the flush.

To fix this issue, start by cleaning the tank thoroughly with a pumice stone or other abrasive sponge to remove sediment from the sides and bottom. Consider using a descaling product specifically formulated for toilets. Flushing a few times with white vinegar or citric acid can also help dissolve mineral deposits. Replace any corroded or damaged tank parts as needed.

Faulty Fill Valve

The fill valve is responsible for refilling the tank with water after flushing. A worn out or faulty fill valve may not seal properly, allowing water to continuously trickle into the tank and cause noises.

Check if the fill valve is old, damaged or misaligned. Try adjusting the float rod and water level if needed. If that doesn’t stop the noise, replacing the entire fill valve assembly should solve the issue. Make sure to get the correct replacement part for your specific toilet model.

Loose Toilet Mounting Bolts

With repeated use over time, the bolts holding the toilet to the floor can become loose. This allows the toilet to rock or wobble when flushing, resulting in a banging or clanking noise.

Tighten the bolts underneath the toilet using a wrench or socket. You may need to remove the toilet for easier access. Replace severely corroded bolts. Adding a silicone-based caulk around the toilet base can help reduce noises from minor rocking or vibration.

Worn Flapper Valve

The flapper is the rubber seal at the bottom of the tank that lifts up to release flush water into the bowl. A cracked, misaligned or otherwise faulty flapper won’t provide a tight seal. This allows water to continuously leak from the tank and cause trickling or running water sounds.

Examine the condition of the flapper and replace it if deteriorated. Make sure the new flapper fits snugly over the flush valve seal. Adjust the flapper chain as needed so the flapper can drop back down and seal completely after flushing.

Poorly Venting Drain Line

In some cases, gurgling or bubbling coming from the toilet drain pipe after flushing indicates a venting issue. Drain vent pipes allow air to enter the system so water can flow freely. Blocked vents prevent proper air flow and drainage, creating noise.

Snaking the drain, adding a vent pipe, or installing an air admittance valve can help solve a venting issue. For persistent noises, there may be a blockage or broken pipe deeper in the drain system requiring professional drain cleaning or repair.

Water Hammer

A loud bang or hammering noise when turning off a faucet or right after flushing is known as water hammer. It’s caused by sudden pressure changes in the water supply pipes. Water hammer from a nearby sink or appliance can reverberate through drain pipes and make the toilet noisy.

Installing water hammer arrestors on supply lines can muffle these pressure spikes. Drain line modifications may also help dissipate the shock waves. If the hammering is severe, consult a plumber to inspect for any pipe or valve damage.

Other Causes

  • A loose toilet seat or tank lid hitting the bowl can create noises. Tighten the bolts or adjust the hinges to prevent banging.
  • A weak or defective flush can leave debris stuck in the trapway, causing gurgling with each flush. Try plunging or use a closet auger to clear any clogs.
  • If noise is coming from a concealed toilet tank, a loose component like the flush valve may be rattling around inside. Open the tank to inspect and tighten or replace any problematic parts.

When to Call a Professional

If you’ve tried the above troubleshooting tips and the toilet is still persistently noisy after flushing, it’s best to call in a plumber. A pro can pinpoint the origin of the noise and remedy any issues requiring specialized tools, skills or replacement parts. They can also check for and correct any underlying drainage problems. Continuing to use a noisy toilet may worsen damage or cause leaks over time.

FAQs About Noisy Toilet After Flushing

Why does my toilet make noise for a few seconds after flushing?

A small amount of trickling or dripping immediately after flushing is normal as the fill valve refills the tank. If the noise persists more than 5-10 seconds, it likely indicates a problem like a faulty fill valve, improperly seated flapper, or poor venting.

What causes banging noises from the toilet after flushing?

Loud banging noises are typically caused by loose toilet mounting bolts that allow the toilet to rock when flushing. Water hammer from nearby plumbing can also reverberate through pipes and make the toilet noisy.

Why does my toilet gurgle after flushing?

Gurgling noises point to an issue with drain venting that prevents proper air flow for water drainage. Blocked vents, clogged drain pipes, or lack of venting can lead to gurgling sounds as the toilet backfills with water after flushing.

What should I do if plungering the toilet doesn’t stop the noise?

If plunging fails to quiet a noisy toilet, inspect the tank components for issues. Check the flapper, fill valve, overflow tube and chain, and sediment buildup. Tightening mounting bolts can also help with banging noises. If the noise persists, call a professional plumber.

Why does my toilet whistle or have a high-pitched noise after flushing?

A whistling or squealing toilet most often indicates that a tank component like the fill valve is leaking or releasing water improperly. Remove the tank lid and listen closely while flushing to identify the problematic part, then replace as needed.

Can a clogged main sewer line cause gurgling toilet noises?

Yes, a severely clogged main drain line can back up sewage and air, causing gurgling noises from drains and toilets throughout the house. This usually requires professional drain cleaning or clearing of the blockage in the main line.

Why does my toilet still make noise after replacing the fill valve?

Other faulty or misaligned components like the flapper valve could be causing the noise if replacing the fill valve did not help. Make sure the flush lever and chain allow the flapper to seal fully after flushing. An air leak between the tank and bowl can also make noises.

What should I check if my toilet is noisy when not in use?

Persistent noises from a toilet that isn’t actively being flushed can indicate a leak from a failed component like the fill or flush valve allowing water to continuously run. Remove the tank lid and visually inspect the various valve assemblies for leaks.

Can low water pressure cause a noisy toilet?

Insufficient water pressure can sometimes result in a weak, incomplete flush that fails to fully clear waste, leading to gurgling sounds on subsequent flushes. Check pressure at other plumbing fixtures and contact a plumber if pressure is persistently low throughout your home.


A noisy toilet after flushing is usually indicative of a fairly minor yet bothersome issue like sediment buildup, deteriorated tank components, or problems with the water supply and drainage pipes. Following some systematic troubleshooting and DIY maintenance steps can help quiet most noisy toilets. Call in a professional plumber if attempts to remedy the noise fail or you suspect deeper drainage system problems. Allowing an experienced plumber to fully inspect your toilet and pipes and make needed repairs can restore quiet operation and prevent potential leaks or damage. With the right repairs, your toilet can flush silently and effectively again.