How do I correct a Low water level problem in toilet bowls.?

I have a 2 story house with 3 bathrooms. The toilet bowl in each one has a low water level. The plumber said he has never seen a situation where all the toilet bowls in a single house had a defect. He still suggest I replace the bowls. However, if the problem is not a defect in the bowls I would have wasted money. Is there some other problem that could cause this low water level?

Answers:
It isn't a defect. The water level in the bowl is determined by the P trap that is design built in the toilet. If you look at the side of the toilet you can see it, it is the s shaped part of the porcelain. The water will be as high as the highest part of this p trap. To know if this is the case absolutely simply pour a bucket of water into the toilet VERY slow. You do not want it to flush during this test by pouring too fast. Now when the water equalizes it will be no higher than the designed water level height. It should rest at close to the level it rest at when flushed. If it is significantly higher then you have a venting problem in the sewage system itself causing too much/long of a siphon cycle. Which simply means that the flush is sucking out more water than the tank is replacing. If this is the case than you need only adjust the tank to fill up to the top of the overflow tube inside the tank. Do this by adjusting the float. This will cause the water to flow longer after the flush which will put more water in the bowl. Hire a better plumber.

Other answers:
You can bend the arm that holds the ball, the straighter the arm, then the more water will fill the tank.
You can bend the arm that holds the ball, the straighter the arm, then the more water will fill the tank.
The plumber's sort of right, it's unusual for all the toilets to have the same problem. It could just be that the previous tenant liked to conserve, so you may try adjusting the spigot behind the toilet (it has a metal hose running from the wall to the back of the tank). It's possible that the house just doesn't have much water pressure... do the sinks and showers run cold water very fast? One way to Macguyver it would be to adjust the arms in the tanks on the back of the toilet. Generally there's a floating piece that raises with the level of the water and closes off the valve to the bowl. If you bend the arm holding the floater upwards so that more water flows before the tank water catches up, then more of it will get to the bowl.
It sounds to me like the refill valve is shutting off too early. I can't tell without seeing the actual toilets, but if the valve mechanisms are all the same, that would be a strong clue.

Try adjusting the valve. If you can't, buy a new mechanism from the hardware store ($10 or $15) and replace it yourself. It's actually quite easy and the instructions that come with the replacements are pretty clear. See if that solves the problem for the one toilet. If so, go ahead and replace the others. If not, at least you haven't spent much money.
jiggle the chain on the inside, see if it is attached, if not attach it. use a plunger. Sometimes it doesn't look stopped up, but a air bubble sometimes gets on the inside and just needs too be pulled.
Place a brick in the tank, to occupy the sppace of about a half gallon of water.
The water level in the bowl is determined by the path of water flow into the drain. I would suggest trying to replace one toilet and see what that does.

(Nothing in the tank can be changed or replaced to affect the water level inside the bowl)
Everyone seems to answer your question about the TANK, not the bowl. My question to you would be, have they ever been at a higher level? Basically the waterlevel would always have to be thesame and is determined by the twisted pipe meeting the floor, because of the twist, water always stays in the bowl. You could check if the waterlevel is level with the top of the lower part of the twisted pipe. If not, there is maybe dirt in it. But then again, strange if all your toilets are low. Then I ask again, have they ever been higher? It must be that they are designed like that
if there is no venting in the plumbing system it is possible that when you flush it syphons extra water out of the bowls, otherwise it is probably the toilets themselves, i would recomend an american standard cadet 3 toilet
The problem is in the tank and not the bowl. The fill valve in the tank is closing too soon. Open the tank and adjust the float or arm. Since there are different designs, you'll have to watch it operate to determine how to adjust it.
I'm with bairland....can't you raise your floats. The reason they have the same problem is they are probably the same make/model which all have the same defect. Good Luck!
is the tank itself full ???? if not raise the float,,,either with the adjustment screw,,or just bend the arm up if metal !!!not too far or it will overflow,,try a bit at a time untill satisfied !!
Problem may be in the bowl fill tube. Also, water only flows into the bowl as long as it does in the tank. Once the float shuts the valve off the water stops flowing into the tank and bowl. Make sure that you are getting a full tank and you should get a proper amount in the bowl. If the water intake valve has been changed it may not be the proper valve for your tank and bowl. Also, proper venting is a must to keep the sewage line from siphoning the water out of the bowl. Improper venting won't affect the tank water only the water level in the bowl.
I find it hard to believe there is a defect in all the bowls unless they were installed incorrectly from the beginning. Is pressure good to the rest of the 2nd story? What about pressure before it enters the bowls? You did not say if they are all running on the same line or are on the same floor. There are adjustments that can be made to the amount of water or pressure in the bowl. Get another opinion I think that plumber doesn';t know what he is talking about.
Ask your neighbours if they have similar problem. Do you live in an elevated area? if so then it could be displacement. Being on a well or a city system makes a big difference. The ball-**** in the back may be shutting your water off prematurely, check the angle. The water level is relative to the height of the ball-****. You can put a brick in the tank to displace about 1ltr of water per flush. Saves a little water, just don't drop it in there or let it interfere with moving parts.
Try raising the floats in the toilet tanks.
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