Mobile Home Water Shutoff Valve: Where to Find It and How to Use It
Most mobile home owners don’t think about their water shutoff valve until a pipe bursts, and then every second counts. Knowing exactly where every shutoff valve is before an emergency can be the difference between a small cleanup and replacing a soaked floor. This guide covers every valve location in a manufactured home, from the main park supply all the way to the washing machine.
Walk through your home today and locate every shutoff valve in this guide. Label the ones that are hard to find with a piece of tape. Write the park’s emergency maintenance number on your fridge. The five minutes you spend now can save you a lot of damage when a pipe fails at 2 AM.
The water supply line enters through the skirting near the base of the home. This is where your under-home shutoff valve is located.
The Main Shutoff: Park vs. Private Land
How your home connects to the water supply determines what shutoff options you have and who controls what. The answer is different depending on whether you’re in a mobile home park or on private land.
In a Mobile Home Park: Two Valves
In a park, there are two main valves to know about:
- The park’s valve (outside crock): This is the valve at the connection point between the park’s main supply line and the line running to your home, sometimes called the “crock” or meter box. This valve belongs to the park. You should not operate it yourself, but you need to know where it is. During a major emergency when you cannot reach your own valve, call the park’s emergency maintenance line.
- Your valve (under-home supply): Where the park’s supply line enters beneath your skirting, there should be a shutoff valve on your side of the connection. This is your responsibility and your primary emergency shutoff. See the next section.
Most mobile home parks have an after-hours emergency maintenance number. Get it from your park office today, write it on your fridge, and save it in your phone. A pipe burst at 11 PM is not the time to be searching for a phone number.
On Private Land: City Water or Well
If your mobile home is on private land with city water, the main shutoff is typically at the street-side meter box, operated with a meter key (check with your water utility before operating it yourself). Your secondary shutoff is where the supply line enters the home through the belly. If you’re on a well, there is usually a shutoff valve near the pressure tank, and switching off the well pump breaker in your electrical panel also stops the pump from supplying water.
Under-Home Supply Line Valve
A ball valve shutoff on the main supply line. Turn it 90 degrees to shut off.
Pull back your skirting near where the water supply line enters the home. The supply line rises from the ground into the belly of the home, and there should be a shutoff valve on that line, typically a ball valve or gate valve within the first foot or two of where it enters.
This is your most important valve. It shuts off all water to the entire home. If yours is missing, which happens in older homes or after replumbing, installing one should be at the top of your maintenance list. For a plumber this is usually a quick job.
The Frozen Pipe Risk
The exposed section of supply line between the ground and the belly is the most freeze-prone part of your plumbing. In cold climates it needs heat tape (an electrically heated wrap that keeps the pipe above freezing) plus insulation, installed according to the heat tape manufacturer’s instructions. Frozen pipes are a common cause of water damage in mobile homes in northern states. See our article on Frozen Pipes in a Mobile Home for the full heat tape guide.
Fixture Shutoff Valves: Every Location
Beyond the main valve, every major water fixture in your mobile home should have its own shutoff valve. These let you isolate one fixture for repair without cutting water to the entire home.
Kitchen Sink
Two valves under the sink, one on the hot supply and one on the cold. Look at the cabinet’s back wall or along the floor near the supply lines. These are typically small quarter-turn or multi-turn compression stops.
Bathroom Sinks
Same setup as the kitchen: hot and cold valves inside the vanity cabinet. If your bathroom sink has no cabinet, the valves are typically at the wall or floor behind the supply tubes.
Shower / Tub
Some homes have shower shutoffs behind an access panel near where the lines rise to the faucet. In many older mobile homes there are no separate shower valves or no access panel. If that’s the case, you’ll rely on the main valve for shower repairs.
Toilet
Located on the wall or floor behind the toilet, on the supply line connecting to the fill valve. Always the first thing to close when fixing a running or leaking toilet. These valves can seize from years of sitting unused, so test yours now.
Washing Machine
Two valves on the wall directly behind the washer, hot and cold. The supply hoses connect to these. You need to pull the washer out from the wall to reach them. Many homes have these; some older ones do not.
Water Softener
If your home has a water softener, there should be a bypass valve or dedicated shutoff on the supply line to the unit. This lets you take the softener offline for service without shutting off household water.
Shutoff valves that sit unused for years can seize in the open position. They look fine but won’t actually close when you need them to. Once a year, turn each fixture valve fully closed and back open, and check for drips at the stem afterward. This keeps the mechanism working and tells you which ones need replacing before an emergency.
Hot Water Heater Shutoff
The shutoff valve sits on the cold water supply line entering the top of the water heater.
In many manufactured homes, the water heater sits in its own closet, often in or near a bedroom or utility area behind a removable panel held on with a few screws. Some homes have an outside access door to the water heater compartment instead. Open the panel or door and you’ll find the water heater along with its supply connections.
The shutoff valve for the water heater is on the cold water supply line entering the top of the unit. Closing this valve stops water from flowing into the heater. Use it when replacing the heater, when the pressure relief valve is discharging, or when you need to drain the tank.
If your water heater is electric and you are going to drain the tank, turn the water heater breaker off in your electrical panel first. Running an electric water heater without water in the tank burns out the heating elements very quickly, a repair that typically runs $150 to $300 on top of whatever work you were already doing. If it’s a gas water heater, turn the gas control to Pilot or Off before draining. Don’t turn the power or gas back on until the tank is completely full again.
Toilet Supply Line Valve
The toilet supply line valve is the small valve on the wall or floor behind the toilet, connecting to the braided supply line that feeds the fill valve in the tank. This is the first thing to close any time you need to work on the toilet.
A running toilet, a cracked fill valve, a leaking supply line: all of these require closing this valve before you start. If your toilet’s supply valve is stuck and won’t close, which happens in older homes, close the main under-home valve temporarily while you replace the stuck fixture valve.
Washing Machine Shutoff
The washing machine hose connections are one of the most common sources of sudden water emergencies in manufactured homes. The supply hoses can develop pinhole leaks or fail at the connection point, and a burst hose under full pressure can release a lot of water very quickly.
Pull the washer away from the wall periodically and inspect both hoses for bulging, cracking, or corrosion at the fittings. Plain rubber washing machine hoses are commonly advised to be replaced about every 5 years regardless of condition. Braided stainless steel hoses are much more resistant to sudden failure and worth the upgrade. The hot and cold shutoff valves on the wall behind the washer should close fully, so test them when you pull the machine out.
Valve Types: What You Have and What to Use
Ball Valves: The Best Choice
A ball valve has a lever handle that turns 90 degrees from fully open (lever parallel to the pipe) to fully closed (lever across the pipe). Ball valves are the most reliable type for shutoff purposes. They seal well, usually still operate smoothly after long periods without use, and their open or closed position is obvious at a glance. If you’re replacing any valve, use a ball valve.
Gate Valves: Common but Problematic
Gate valves have a round wheel handle and take multiple full turns to open or close. Many older mobile homes have gate valves on the main supply line. The problem: gate valves can fail after years of disuse. The gate inside can corrode or break off the stem, leaving the valve stuck open or unable to fully close. If you have gate valves, consider replacing them with ball valves before they fail.
SharkBite Valves: No-Solder Installation
SharkBite push-fit valves are very handy for mobile home plumbing repairs. They push onto PEX, CPVC, or copper pipe without soldering, gluing, or special tools. Cut the pipe square, remove any burrs, mark the insertion depth, and push the fitting on until it reaches the mark. That makes them a good fit for adding a missing shutoff valve or replacing a failed one in the tight spaces common in manufactured homes. They cost more than standard fittings, but the time and skill they save often make them worth it.
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SharkBite Push-to-Connect Ball Valve
Works on PEX, copper, and CPVC pipe with no soldering or special tools. Useful for adding or replacing shutoff valves in tight under-sink or under-home spaces. Available in 1/2-inch and 3/4-inch sizes, so measure your pipe before ordering.
View on AmazonWater Sensing Auto-Shutoff Valves
If you leave your mobile home unoccupied for extended periods, seasonally or when traveling, a leak-sensing shutoff valve is worth considering. These devices install on your main supply line and use moisture sensors placed near likely leak areas. When water is detected, the valve closes automatically. For a home that sits empty, this can stop a slow leak that would otherwise go unnoticed for weeks.
Restoring Water After a Shutoff
When you reopen the main supply valve after any plumbing work, do it slowly and follow this sequence to limit water hammer and sputtering from trapped air:
- Open the faucets in the home, hot and cold, before turning the main valve back on. This lets air escape as water fills the lines.
- Turn the main valve on slowly, not all at once. Give the lines time to fill gradually.
- Let the faucets run until the sputtering stops and water flows clear and steady.
- Close faucets one at a time, starting with the farthest from the main supply and working toward it.
- If you shut off or drained the water heater, make sure the hot taps are running steady water (the tank is full) before turning the breaker or gas back on.
- Check under sinks and around any fixtures you worked on for drips before calling the job done.
Would You Rather Sell Than Repair?
A missing shutoff valve is a small fix, but years of hidden leaks can mean soft floors and bigger repairs. If the plumbing is one item on a long repair list, selling the home as-is is one option to compare. I buy mobile homes that need work, and you don’t have to fix anything first.
Frequently Asked Questions
Where is the main water shutoff in a mobile home?
Pull back the skirting near where the water supply line enters the home. The main shutoff valve is usually on that line within the first foot or two of where it enters the belly. In a park, there is also a valve at the park’s crock or meter box that park maintenance operates. On private land, the shutoff is typically at the street-side meter box, or near the pressure tank if you’re on a well.
What should I do immediately if a pipe bursts?
Close the under-home main shutoff valve right away. If you can’t find it or it won’t close, call park maintenance so they can close the park-side valve. Then call a plumber. If water is near outlets, cords or appliances, turn off power to that area at the breaker before you step in it. While you wait, put down towels and move belongings away from the water. Water sitting on a mobile home floor quickly damages the subfloor (often particleboard in older homes), which is expensive to repair.
Do I need hot and cold shutoffs under every sink?
Yes, it’s a good idea. Separate shutoffs on the hot and cold lines to each sink let you stop water to that sink without shutting off water to the rest of the home. If your sinks don’t have them, adding them is usually inexpensive and straightforward with push-fit valves.
What size is the main water supply line in a mobile home?
The main supply line in many manufactured homes is 3/4-inch, and branch lines to individual fixtures are typically 1/2-inch. To confirm, measure the outside diameter of the pipe: 3/4-inch PEX, copper, or CPVC measures about 7/8 inch across the outside, and 1/2-inch measures about 5/8 inch.
Why won’t my shutoff valve turn?
A valve that won’t turn has usually corroded or seized from years of sitting unused. This is especially common with older gate valves. Don’t force it hard, because you can break the valve or snap the stem and make things worse. Apply penetrating oil, let it sit for about 30 minutes, then try again with steady pressure. If it still won’t move, the valve needs replacing. Close the main under-home valve (or have park maintenance close the park-side valve) while the work is done.
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