There are a few different reasons that water could be coming out of your dryer vent. One possibility is that the vent pipe is damaged and is allowing condensation or water to leak in from the outside. Another possibility is that there is a clog somewhere in the vent line, which can cause water to start leaking out of the system. If you notice that your water usage has increased recently and you think there might be a problem with your dryer vent, it's best to take action and have it checked out by a professional.