Water on the floor or even a wet appearance around a toilet is always a sign of a problem. There are several causes that can lead to a wet appearance on the floor grout. The grout lines are often the lowest part of the floor and accumulate and show the water first. For this reason the wetness should be seen as a first sign of trouble and dealt with before the problem becomes worse.
Warm, moist air that comes in contact with cold materials, like a toilet that has just been flushed, condenses. This means the water vapor in the air has turned to liquid on the surface of the toilet. This water then runs down towards the floor and can result in a wet look to the floor. To check if the water accumulation you're seeing is condensation dry the floor and flush the toilet. Watch for an accumulation of water and identify its source. Limit the amount of airborne humidity in the bathroom by using exhaust fans to reduce condensation. Left unchecked the moisture can result in wetness to the wood floorboards, which can lead to decay.
Leaking Wax Ring
The joint between the toilet and the flange or top edge of the plumbing pipes is sealed by a wax ring. If this ring develops a leak, water can leak along the floor of the home. This is more dangerous because if water leaks along the floor, sewer gas can also enter the room. Repair involves removing the toilet and replacing the wax ring and is commonly a job left for a plumbing professional.
Leaking Toilet Tank
A leak at the connection between the toilet tank and toilet bowl may also result in water leaking to the floor when the toilet is flushed. Check for the source of the water. In this case the water will run down along the back of the toilet bowl from the joint. Repairs to this joint require removing the toilet tank and replacing the rubber gasket.
Leaking Water Line
Leaks from the water line connected to the toilet are commonly continuous and not related to the flushing cycle. Check the point where the water supply line connects to the household water line at the valve and also where the line connects to the toilet.