Yes, it's fine to leave it off overnight. If there's a toilet leak, overflow, or any malfunction, shutting off the valve will shut the water supply and prevent further issues.
No danger in turning off the water. Actually it is a good idea to do so. All those plastic tubes and hoses connecting your fixtures to the wall like the ones found under you kitchen and bathroom sink, toilets, washing machine, behind your refrigerator, etc.
Don't Leave a Toilet Clogged Overnight — Take Action!
The answer is: it's not worth the risk.
Residual Water
As water freezes and expands, it can still cause the pipes to burst if you don't drain them properly. This expansion can create significant pressure within the pipe walls, leading to cracks or complete bursts.
Do feel free to shut off your water. That is fine, and the system will stay pressurized unless you have a faucet drip somewhere. I have seen houses hold pressure for months.
The way toilets work: Flushing when water is shut off doesn't do any damage, it just empties the tank. No biggie, this is a normal operation when changing the parts in the tank or doing other maintenance.
Unless you turn off the water coming into your home, water sits in the pipes, waiting to be used by faucets, toilets and water-using appliances. If any of those lines fail from age, wear, corrosion or breaks, water will flow out at normal pressure just as if a faucet had been turned on.
After shutting off the main valve, ensure you drain the water from all the fixtures. In summer, the temperature of the water raises the pressure inside the pipes. If there is a crack, parts of your plumbing could burst. It is even more critical to drain hoses and faucets in the winter.
Overall, it's best that you take heed and drip your faucets when temperatures dip below freezing. A simple trickle of hot and/or cold water—both from faucets inside and outside the home—can prevent you from having to deal with a much larger issue (and bill!) in the long run.
Pipes typically burst when exposed to extremely low temperatures for an extended period of time (anywhere from 1-3 days depending on temperature).
It is perfectly safe to turn it off by either turning the wheel clockwise or closing the lever.
Leaving a toilet clogged overnight is not advisable for several reasons. First, it can cause unpleasant odors and unsanitary conditions in your bathroom. The longer the clog sits in the toilet, the more bacteria will grow, and the smell will become increasingly unbearable.
No need to worry, a running toilet is usually a simple fix. The three most common causes are a broken or dirty flapper, too long or too short of a chain between the flush lever and the flapper or a float that is out of position. The first thing you will need to do is turn off the water feeding into the toilet.
Use a Bucket to Flush a Toilet Without Running Water
All you need to do is quickly pour about 1.6 gallons of water into the toilet bowl. The hardest part of flushing a toilet this way might be getting the water. If the shutoff is planned, you should fill up a bucket or two with water before turning off your water.
Shut off the water supply:
Locate the main shut-off valve for your water supply and turn it off. This will prevent any further water from entering the pipes and causing more damage. If you can't find the main shut-off valve, turn off the water supply to the affected fixture or appliance.
Pipes can still burst in freezing temperatures even after you turn off your home's water. The pipes will still have water inside them, which means the water may freeze and potentially burst your pipes.
Immediately after you turn off the main water valve, turn on a tub or sink faucet to its highest level, for both hot and cold connections. This relieves the pressure in the plumbing lines, and also ensures a full shut-down. Continue to open faucets around the house to drain down the home.
If you live in a climate with freezing temperatures, you'll want to cover your outdoor faucets in the winter rather than dripping them. Even with a vigorous drip, frigid temperatures can travel through your faucet and freeze the connecting pipes. Before using a cover, you'll need to properly winterize your faucet.
No problem. Toilets don't technically require running water in order to flush. Grab at least two gallons of water from an outside source and open the lid to your tank. Slowly pour the water into the tank until it fills the top of the overflow tube.
If you decide to turn your water heater off for vacation, it might be a good idea to test it beforehand. You could try turning it off and on over the course of a day to make sure it won't cause any problems. Otherwise, it's best to just leave it on for your time away.
Shut Off the Water
This step isn't necessary for a short getaway, but if you will be gone a week or more it is a good practice to get into. It's best to turn off the water main but if you have appliances like an ice maker that need water regularly you can still turn off the water to your bathroom toilets and sinks.
Opening the faucets drains the pipes once you turn the water off. Leaving them open prevents any pressure build-up, which can help in cold weather climates to avoid water freezing in the pipes, which can cause major issues as pipes can expand, crack, and burst.
Preparing your toilets before you leave is crucial to prevent odors and bacteria buildup. After turning off the water supply, flush each toilet to drain the tank and bowl. Then, clean the bowl thoroughly. You can also place plastic wrap over the toilet bowl to prevent evaporation and keep odors at bay.
Well-maintained traditional gas and electric hot water heaters can last 8-12 years, or more, before it's time for a hot water heater repair or replacement. Turning off your unit while you'll be away— or anytime your main water supply is off— is a good way to prolong the life of your system.