How to Fix Low Water Level in a Toilet Bowl

Is the water level in your toilet lower than usual? Is your toilet bowl not filling with water after flushing? This common occurrence has a few potential culprits, and luckily, most are easy to adjust with a little plumbing know-how and a few minutes of your time.

4 Reasons for Low Water Level in your Toilet Bowl & How to Fix It

Read on to learn the top four most common reasons the water in your toilet bowl is low and how to raise the water level in a toilet bowl.

1. The Fill Tube Is Damaged

The most common reason your toilet bowl water level is low is a damaged fill tube.

The fill tube is a small flexible plastic hose. It’s usually black or clear and connects to a vertical, wider plastic tube (called the overflow tube) within the toilet tank.

This small component is responsible for allowing water to flow into the toilet bowl each time the toilet is flushed. Over time, it can unclip from the overflow tube or simply succumb to general wear and tear. When this happens, the toilet tank fills with water and the valve shuts off the water flow before the bowl fills adequately.

SOLUTION: Lift the tank lid to visually inspect the fill tube to determine whether it has shifted or is damaged. If it’s in good condition but not connected to the overflow tube, place it back into the cylinder.

2. The Toilet Bowl Is Cracked

Although cracks in the toilet bowl are rare, it can happen. When there’s a crack on the lower bowl, the water will leak out onto the floor. As a result, the water levels in your toilet bowl will be noticeably lower.

SOLUTION: If your toilet bowl is cracked, give your local plumbing professional a call, it will need to be replaced.

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3. The Sewer Vent Line Is Blocked

Although rare, low toilet bowl water levels can be caused by an issue with the sewer vent line.

The sewer vent line runs through the wall in your bathroom and out of the roof of your home. This important component of your plumbing system works to remove sewer gases when the toilet flushes. If there is no free flow of air through the vent line, the water level can be affected.

Possible reasons for blockage include:

  • Leaves, small branches, and other debris falling onto your roof
  • Bird’s nest
  • Dead rodent (gross, but true)

SOLUTION: Remove the debris from the roof and shine a flashlight into the vent. If you see a clog, insert a plumber’s snake to dislodge it. If that doesn’t work, or you don’t see a blockage, call a plumber.

4. The Fill Valve Is Damaged

To see what a fill valve looks like, check out our video on how to replace a toilet flapper and valve. If it is damaged, you can purchase a replacement at any hardware store.

SOLUTION: For step-by-step directions on to replace the valve, check out our article: How to Replace a Toilet Fill Valve in 8 Steps

Professional Plumbing Services in South Florida and Beyond

At Sansone, our plumbing experts are experienced with all types of plumbing systems. Our team of professionals provide quick and efficient plumbing repairs to get your home back to the comfortable oasis it should be.

If your toilet bowl water level is low and you’re not sure why contact us today.

Broward: (954) 800-2858
Palm Beach: (561) 701-8274
St. Lucie: (772) 879-5656

Schedule Service