N2316 toilet Water levels in bowl drop so low you get a sewer gas smell.

SOURCE: American Standard Elongated toilet bowl water level slowly drops

The tank holding the proper amount of water is a good sign. The inside of the stool is like the GOOSE NECK under you sink. It always holds water. This may sound like a bit of a hassle to do but if all 3 toilets are identical, here is what you can try if you are a bit handy. Go to the hardware store and purchase 4 toilet wax rings with a plastic flange and a few sets of toilet floor flange bolts(they are cheap and you can always return if not used, as It is better to have xtra parts on hand). Turn off the water supply to the "Mystery Toilet". Leave the tank and everything connected to the stool. Flush the toilet and remove all excess water from the tank and bowl. This can be done with a shop vac, sponge or towel. Disconnect the water supply to the tank. Remove the bolts holding the stool to the floor and carefully remove toilet. Scrap off all the old wax from the floor flange and bottom of stool. Now go and repeat this proceedure to one of the toilets that is working properly. In other words Switch the "Mystery Toilet" with a "Working Toilet" and see how they react. If the working toilet does it in the same bathroom and the "Mystery Toilet" does not do it in the other bathroom then you probably have a VENTING PROBLEM. If the "Mysery Toilet" Does it in the other bathroom then you most likely have a Defective Toilet. This Job is best done by 2 people, as it can sometimes be challenging to center the new wax ring on the toilet flange. Reconnect to the floor and reconnect water supply to the tanks. DO NOT OVERTIGHTEN BOLTS to the floor flange as you may crack the toilet. All drain lines must be vented properly for water to flow. If you are curious check out drain venting on the internet. Also, sometimes a vent can become obstructed with debris, ice, bird nest, etc.. I would 1st check the vent on the roof visually and then have someone flush and listen. If you believe the vent is clear....Then do the toilet switch and go from there.....Hope this helps and Happy Holidays....Joe

SOURCE: toilet does not flush strong enough to take down feces in bowl

You need to do 2 things. Take the lid off and check that the water level is up to the fill line, if it is you need to adjust the flapper. If it's not back the screw out on top until it is. Their should be a cylindrical piece of foam on the chain going to the handle. You need to pull off the retainers and move that foam closer to the flapper thus dumping more water in each flush.

Please rate this solution-

SOURCE: raising water level in the toilet bowl.

The water level in the bowl is limited by the height of the internal trap down stream from the bowl. There is no adjustment possible. If the problem is odors, you can either flush more often, turn on the exhaust fan, or buy a different brand or model of toilet.

SOURCE: Low water level in toilet bowl

Sorry, but there is no way to raise the water level in the bowl of a low-flow toilet. The water level is determined by the height of the internal trap, usually visible from the side of the toilet (that squiggly little bend). If the toilet is not flushing satisfactorily, you can make adjustments to the water level in the tank and adjust the closing of the flapper. If the problem is odors, flush half way through your business or turn on the bathroom exhaust fan. If you found this answer helpful, please don't forget to rate it.

SOURCE: Replaced toilet fill valve - now bowl water level a bit lower

put some water in with a bucket. poor some in slowly until you get it where you think it should have been. If it levels back out at the lower level. Then there is nothing wrong. Maybe the leaking water was keeping the bowl water line high than it should have been.