Same-Day Service Available
Need a Plumber in Knoxville? We’re Ready to Help!
Preparing home plumbing before a long trip starts with reducing pressure and limiting the chance of leaks or freeze damage. Closing the main shutoff valve stops any supply line failure from running unattended. Water heaters should be set to vacation mode or a reduced temperature. In winter, keep the thermostat set to at least 55 degrees to help reduce freeze risk. For longer absences, unused drain traps can dry out and allow sewer gas into the home, which is addressed by refilling them on return.
A supply line that fails while someone is home makes a mess. The same failure on day three of a two-week trip makes a claim. What often makes unattended water damage more costly is the amount of time water runs before anyone notices. That single variable explains why unattended water damage tends to be so much more expensive than the same event with someone in the house.
Tennessee Standard Plumbing has handled the aftermath of both versions across Knoxville and Knox County for more than 13 years. With a 5.0 Google rating from more than 1,000 reviews, our team helps farms, second homes, and vacation properties in East Tennessee. This means we often see how an empty house affects the plumbing system. Homeowners planning a trip can reach Knoxville’s local plumbing team for a pre-travel check.
The steps below are organized by what fails, what to shut off, what to adjust, and how the answer changes with the length of the trip.
An empty house can still face plumbing risks, especially because no one is there to notice early signs of trouble. Supply lines stay pressurized, water heaters keep cycling, and seasonal temperature swings continue. What changes is that nobody is present to notice the first sign of trouble, so every failure runs to its full extent.
Toilet supply lines, faucet connectors, refrigerator water lines, and washing machine hoses hold pressure continuously. Rubber hoses for washing machines last about 5 years. Plastic lines for refrigerators, found behind appliances, are often ignored in homes. None of these care whether the home is occupied. A worn connector can fail whether the home is occupied or not.
Every drain holds a small water seal in its P-trap that blocks sewer gas from entering the home. That seal evaporates and can dry out after a few weeks of disuse, depending on conditions, faster in dry, heated air. Guest bathrooms, basement floor drains, and utility sinks are the usual offenders, and the result is a sewer odor that greets the household on return. Running each unused fixture for a minute refills the trap and clears the smell.
East Tennessee freeze events are typically short but sharp, and an unoccupied house has no one to notice a thermostat failure or a power interruption. Homes left unoccupied during winter should keep heat on to reduce freeze risk. The related risk of a power interruption during an absence is covered in this overview of plumbing dangers during power outages.
Closing the main shutoff valve is the highest-value action before an extended absence, because it removes pressure from the entire system. A supply line cannot flood a house it is not feeding. The decision comes down to trip length and whether anything in the home needs water while nobody is there.
For longer trips, many homeowners choose to close the main shutoff valve. The valve sits near the front foundation wall in a crawl space or basement, in a utility room near the water heater, or in a covered meter box near the street. Gate valves with a round handle close clockwise over several turns. Ball valves with a lever close in a quarter turn. Opening a low faucet afterward drains residual pressure from the lines.
Some households cannot close the main because an irrigation system, a humidifier, or a pet watering device needs supply. In that case, individual stop valves under sinks and behind toilets and the washing machine cover the highest-risk connections while leaving the rest of the system live. This approach can work for shorter trips or when someone will check the house.
Refrigerator ice makers continue producing ice on a timer and will keep calling for water. On a long absence, that can leave the ice maker running for no benefit and keep the supply line pressurized. Turning the ice maker off is a two-second task that is almost always skipped. Irrigation controllers should also be reviewed, since a zone running unattended for weeks can saturate a foundation. Households worried about an existing weak point can arrange burst pipe repair before travel rather than after.
Appliances that cycle on a schedule keep cycling for an empty house. Adjusting them before departure saves energy and, more importantly, reduces the number of components operating without supervision.
Many tank water heaters have a vacation setting. If yours does not, follow the manufacturer’s instructions for temporary shutdown or a reduced setting. On gas units without that feature, the thermostat can be set to its pilot position. Fully shutting a unit down is reasonable for long absences, though it should be done in the correct order, and anyone unsure about the restart procedure can ask about water heater services before leaving.
Washing machine supply valves should be closed at the wall, since those hoses hold pressure at all times and are a leading cause of indoor flooding. A dishwasher should finish its cycle and drain fully rather than sitting with standing water. Refrigerator water lines run to a plastic connector behind a heavy appliance, which makes a slow leak there both likely to go unnoticed and awkward to reach.
Homes with basements or crawl space drainage depend on a sump pump that has no supervision during an absence. Testing it before departure by pouring water into the pit confirms the float and pump both respond. A battery backup matters most precisely when nobody is home, since a storm that knocks out power is the same storm producing the water the pump is meant to handle.
The right checklist depends on how long you’ll be away. A long weekend and a month abroad call for different measures, and treating them identically means either wasted effort or unnecessary exposure.
Short trips justify closing individual stop valves at the washing machine and turning off the ice maker, while leaving the main open. In winter, the thermostat stays at 55 degrees or higher. Cabinet doors under sinks on exterior walls can be opened to let warm air reach the pipes if a freeze is forecast during the absence.
At this range, closing the main becomes the default. Water heaters go to vacation mode. A neighbor or caretaker with a key and the location of the shutoff valve adds meaningful protection. On return, every unused fixture gets run briefly to refill traps that have partially evaporated.
Beyond a month, and for second homes around Norris Lake or in the mountains that sit empty through a season, full winterization becomes the sensible approach. That involves draining supply lines rather than simply closing a valve, since water left standing in a line can still freeze. Freeze and leak alarm systems that notify a phone are worth considering for any property regularly left unattended through winter.
Pre-travel plumbing prep is quick once a household knows the order of operations. Our team at Tennessee Standard Plumbing is glad to walk a Knoxville homeowner through it, or to handle a pre-trip inspection for a property that will sit empty for a while.
Four points cover most of the risk. Close the main shutoff valve for any trip beyond about a week. Set the water heater to vacation mode or its pilot position. Keep winter heat at 55 degrees or higher regardless of occupancy. Run every fixture briefly on return to refill dried traps.
Homeowners who want a pre-travel check can call our team at (865) 352-9003 or contact our team online. Peaceful Pipes, Peaceful Life.
We serve Knoxville, Farragut, Norris, and communities across Knox County and East Tennessee.
For longer trips, shutting off the main water supply is often recommended. Closing the main removes pressure from the whole system, so a supply line failure cannot flood an unattended house. For shorter trips, closing individual stops at the washing machine and turning off the ice maker covers most of the risk.
In most Knoxville homes, it sits near the front foundation wall in the crawl space or basement, in a utility room near the water heater, or in a covered meter box near the street. Locating and testing it before a trip is far easier than searching for it during an emergency.
The water seal in unused P-traps evaporates over roughly 2 to 4 weeks, removing the barrier that blocks sewer gas. Guest bathrooms, basement floor drains, and utility sinks are the usual sources. Running each fixture for a minute refills the trap and the odor clears.
55 degrees or higher, even in an empty house. Lowering it further to save energy risks pipe freezing in crawl spaces, exterior walls, and unheated areas. The cost of a freeze-related repair is usually far greater than the energy saved by lowering the thermostat too much.
Vacation mode or the pilot setting is usually the better choice for trips of one to four weeks, since it avoids repeatedly heating a full tank for nobody. A complete shutdown suits longer absences, though restart order matters and a tank should never be energized without a full water supply.
Turning off the refrigerator ice maker. It keeps producing on a timer for an empty house, holds a plastic supply line under pressure behind a heavy appliance, and produces a freezer full of fused ice. Closing washing machine supply valves runs a close second.
Only partially. Closing the valve stops resupply, but water already standing in the lines can still freeze and split a pipe. For extended winter absences, draining the supply lines after closing the valve is the more complete approach, particularly in seasonal or second homes.
Yes. Pouring water into the pit confirms the float rises and the pump discharges. A pump that fails during an absence has no one to notice, and the storms most likely to cause power loss are the same ones producing the water the pump is meant to move. Battery backup matters most when nobody is home.
For absences beyond a week, it adds real protection. A neighbor or caretaker who knows where the shutoff valve is and how to operate it can stop a failure within hours rather than weeks. Leaving contact details for a plumbing company alongside the key shortens response time further.
Reopen the main slowly rather than all at once, so the system repressurizes gradually. Then run every fixture briefly to refill dried traps and clear stale water from the lines. Checking under sinks and around the water heater for moisture confirms nothing shifted while the house was empty.
If your tankless water heater stops working, the most common causes include power supply failures, low water flow, gas supply interruptions, minera... Read More
Repeated drain clogs signal deeper sewer problems because they indicate blockages in the main line, not just a single fixture, often caused by tree... Read More
Key Takeaways Tree roots are one of the leading causes of sewer line damage across East Tennessee, especially in older neighborhoods with ... Read More
