When water comes into your toilet bowl after a flush, it sits at a constant level. If you notice that this water level is lower than usual, then you might have a problem. Why is the water in your bowl so low?
Blockages
Sometimes, a clog in your toilet's system can affect the volume of water that stays in a bowl after a flush. A minor blockage can do this by preventing your system from working correctly. For example, the water might rise higher than normal when you flush and then go down to a much lower level than usual.
This problem often resolves itself. A couple of extra flushes might be enough to push the blockage through the system and get things working again.
However, if the blockage is bigger or further down in the drain, then it won't go away on its own. In fact, it could get worse. If it blocks your system completely, then your toilet could start to fill too high and even overflow.
Tank Problems
Your toilet's tank controls the water that goes into your bowl after a flush. The tank releases water when you flush and then refills itself.
If a part in the tank has a problem, then it might affect this process. For example, if a fill valve or control isn't working, then the tank might not fill up enough to give a full flush. Your toilet might work, but its post-fill level might be lower because the system isn't providing enough water.
Inlet Hole Problems
Your toilet bowl contains inlet holes. When you flush, water comes down and out from these holes to fill the bowl.
Sometimes, these holes can get blocked up, say with limescale. If some of them are blocked, the water can't come out of them. This affects the volume of the water each flush provides. It can then reduce the water level in your bowl after a flush.
Leaks
If your toilet cracks or breaks, then it can start to leak. You can't always see this damage if it is further down in your system. However, it can affect the level of water in the bowl.
Here, the leak lets water out of your toilet. The water in your bowl after a flush might be at a normal level to start with, but it will then slowly recede as it leaks out further down the system.
If your water level doesn't go back to normal, then you need to call out a plumber. If this problem doesn't resolve itself fast, then you could have a more serious problem with your toilet or in its drain.
Contact a plumber near you to learn more.
