Plumbing Checklist Before Vacation: How to Best Plan for Vacation

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In Post 33 we covered the risks that extended absence creates for your plumbing system, and why the consequences of a plumbing problem in a vacant home are so much more serious than the same problem in an occupied one. If you have not read that post, it is worth starting there for the full context.

This post is about action. Specifically, the practical steps you take in the hours and days before you leave, working through your home systematically so that your plumbing system is in the best possible position to look after itself while you are away.

The checklist approach here is intentional. Vacation preparation involves a lot of competing priorities, and a systematic walkthrough is more reliable than trying to remember everything from memory while simultaneously packing, arranging pet care, and confirming travel details. Work through these steps in order, and by the time you lock the front door you will have done everything that can reasonably be done to protect your home.

This article is part of the Seasonal and Risk Prevention section of the Homeowner Education Series from 3rd Rock Plumbing, helping homeowners stay ahead of seasonal plumbing risks before they become emergencies.

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Plumbing Checklist Before Vacation

Step 1: Decide on Your Water Supply Strategy

The single most impactful decision you will make in vacation plumbing preparation is what to do with your main water supply. Everything else on this checklist is built around that decision.

For trips of three days or fewer: Shutting off the main supply is not typically necessary for short absences. The risk of a supply-side failure in three days is relatively low, and the inconvenience of restoring water service when you return is not worth it for a brief trip.

For trips of four to seven days: Consider shutting off the main supply, particularly if your home has older supply lines, an aging water heater, or a history of any plumbing concerns. At this duration, a supply-side failure could run long enough to produce significant water damage.

For trips of one week or longer: Shut off the main water supply. The math is straightforward: the longer the absence, the greater the potential damage from any supply-side failure running undetected. Shutting off the main supply eliminates that entire category of risk for pressurized supply lines.

How to shut off the main supply: Your main water shut-off valve is typically located where the water service enters the home: in the basement, crawl space, utility room, or near the water meter. Turn the valve clockwise (or lever-style valves a quarter turn perpendicular to the pipe) until flow stops. We covered locating your main shut-off valve in detail in Post 3 of this series.

Important note when shutting off the main supply: When the main supply is shut off, set your water heater to vacation mode or turn it off entirely. A water heater that continues to heat water in a closed system (with no supply replenishing what is used) can develop excess pressure. Most modern units have safety features that handle this, but setting vacation mode eliminates the concern entirely and saves energy throughout your absence.

Step 2: Water Heater

Whether you are shutting off the main supply or not, the water heater deserves specific attention before any extended absence.

Set vacation mode. Most modern water heaters have a vacation or away setting that reduces the set temperature to a minimal holding level during the absence. This reduces energy consumption and, as noted above, reduces the potential volume and severity of a developing leak if one occurs while you are away.

Check for any developing symptoms before you leave. If your water heater has been making unusual sounds, if you have noticed any moisture around the base, or if hot water performance has been inconsistent in recent weeks, have it evaluated by a plumber before you leave rather than hoping it holds through your absence. A water heater that is developing a problem does not improve with time.

Tankless water heater note. Tankless water heaters do not have a traditional vacation mode but also do not have a stored tank of water to manage in the same way. In most cases, a tankless unit can simply be left in its normal state when the main supply is shut off. Consult your unit's manual for specific manufacturer guidance.

Step 3: Toilets

Toilets deserve a brief but important pre-departure check because they are one of the most common sources of continuous water loss in a home, and a running toilet that was easy to ignore by sound becomes a significant water waste issue over a week-long absence.

Confirm no toilet is running. Flush each toilet in the home and observe whether the fill cycle completes cleanly and the sound of running water stops within about a minute. A toilet that continues to run after the tank should be full has a flapper or fill valve issue worth addressing before you leave.

Quick flapper test. Add a few drops of food coloring to the tank of each toilet. Wait ten minutes without flushing. If color appears in the bowl, the flapper is not sealing and water is running continuously. This is a simple, inexpensive repair that should be done before departure rather than left running throughout your absence.

For longer absences in homes with older toilets: Consider turning off the individual supply valve at the base of each toilet before leaving. This is a simple quarter-turn shutoff that stops water supply to the toilet without affecting the rest of the home's plumbing. The toilet cannot overflow or run in a supply-off condition.

Step 4: Washing Machine

The washing machine is one of the highest-risk appliances in the home from a vacation water damage standpoint. As we covered in Post 33, washing machine supply hoses are under continuous pressure whether the machine is running or not, and a hose failure can release significant amounts of water very quickly.

Turn off the supply valves. Behind or beside every washing machine there are two supply valves, one for hot water and one for cold. Turn both clockwise until they stop. This eliminates the pressure from those supply lines and removes the risk of a hose failure during your absence.

Inspect the hoses while you are back there. Before turning the valves off, take a moment to look at both hoses. Check for any bulging, cracking, brittleness, or corrosion at the fittings. If you see any of those signs, the hose should be replaced before you leave, not when you return.

Leave the machine door or lid open. Washing machines left with the door closed trap moisture in the drum, which can promote mold and mildew growth during an extended absence. Leaving the door or lid slightly open allows the interior to breathe and stay dry.

Step 5: Under Every Sink

A quick under-sink check in every bathroom, the kitchen, and any utility areas takes only a few minutes and catches any developing drips or moisture that should be addressed before departure.

Open each cabinet and look for:

• Any moisture, water staining, or standing water on the cabinet floor

• Dripping or visible mineral deposits at supply line connections or P-trap fittings

• Soft spots in the cabinet floor material (which indicate moisture absorption that has been occurring for some time)

  
  

Inspect supply line condition. Look specifically at the flexible supply lines connecting the shut-off valves to the faucet or fixture. These lines have a finite service life and should be replaced if they show any signs of wear, corrosion at fittings, or bulging. A supply line failure under a sink produces the same category of damage as a washing machine hose failure, continuous pressurized water in an enclosed cabinet space.

Consider turning off individual shut-off valves. For longer absences, turning off the individual shut-off valves under each sink (in addition to or instead of the main supply) provides a localized layer of protection. These quarter-turn valves should be tested occasionally to confirm they still operate freely, valves that have not been turned in years can seize.

Step 6: Dishwasher

The dishwasher is an often-overlooked source of vacation water risk. Like the washing machine, the dishwasher has a supply line that is under continuous pressure when connected to supply.

Confirm the last cycle completed. Make sure the final cycle before your departure ran completely and the unit drained fully. A dishwasher left mid-cycle with standing water in the basin is a mold risk during an extended absence.

Turn off the supply valve. The dishwasher supply valve is typically located under the kitchen sink. Turning it off before departure eliminates the pressurized supply line risk for the dishwasher.

Leave the door slightly ajar. Same principle as the washing machine; a slightly open dishwasher door allows the interior to dry out and prevents mold development during an extended absence.

Step 7: Outdoor Plumbing

Outdoor plumbing gets specific attention before any summer absence since it is in active use during warm months and presents its own set of departure risks.

Irrigation systems. If your home has an in-ground irrigation system, decide whether to leave it running on its timer or to shut it down during your absence. For short trips, leaving the system on its normal schedule is typically fine. For longer absences, particularly if you are not confident in the system's current condition or if there have been any zone irregularities recently, shutting the system off entirely before departure is the more conservative choice.

If you leave the system running, confirm the rain sensor is functional; an irrigation system that continues to run during rainstorms in your absence wastes water and is a sign the rain sensor needs attention.

Hose bibs. Disconnect all garden hoses from outdoor spigots before leaving. A hose left connected to a frost-free bib can prevent proper drainage and creates a small but unnecessary risk. Disconnecting hoses takes thirty seconds per spigot.

Pool and spa equipment. If your property includes a pool or spa, follow the specific maintenance protocol for your equipment during extended absences. In warm summer months, water chemistry management during absence is primarily a water quality concern rather than a plumbing concern, but any equipment that circulates water through supply connections should be confirmed to be in good working order before you leave.

Step 8: Drains and P-Traps

This step is specifically for longer absences where the home will be completely unoccupied for two weeks or more.

As covered in Post 33, P-traps in infrequently used drains can dry out during extended periods of vacancy, allowing sewer gas to enter the home. Before leaving for a longer absence, run water briefly in every drain in the home (every sink, every tub, every shower, every floor drain) to ensure all P-traps are fully charged with water at the time of departure.

For very long absences, adding a small amount of mineral oil to infrequently used drains can slow evaporation of the P-trap water seal. Mineral oil floats on top of the water in the trap and reduces the rate at which it evaporates.

Step 9: Set Up Your Monitoring

Before leaving, confirm that whatever monitoring approach you have decided on is active and functioning.

Leak detection sensors: Confirm sensors are powered (batteries fresh or power connected) and that the associated app on your phone is active and set up to send alerts. Test each sensor briefly by touching it with a damp cloth to confirm the alert fires correctly.

Smart thermostat: Confirm the thermostat is set to maintain a minimum temperature appropriate for the season and that remote access through the associated app is working. For summer absences, the risk of heat-related pipe issues is low, but confirming the HVAC system is operational provides useful overall home monitoring.

Trusted contact: Confirm that the neighbor, family member, or property checker who has agreed to check on the home during your absence has the following information: the location of the main water shut-off valve, your contact information and the best way to reach you, the name and number of your preferred plumber (3rd Rock Plumbing at 828-324-0500), and any specific things to look for based on your home's known characteristics.

Step 10: Final Walkthrough

Before locking the door, a final two-minute walkthrough confirms everything is in order.

• Main water supply shut off (if applicable)

• Water heater set to vacation mode

• Washing machine supply valves closed

• Dishwasher supply valve closed

• No running toilets (listen at each one)

• All outdoor hoses disconnected

• Leak sensors active and tested

• Trusted contact confirmed and informed

• Irrigation system confirmed on schedule or shut down

This final walkthrough takes less time than it takes to read through the list. It is the difference between leaving with confidence and spending the first day of your vacation wondering whether you remembered everything.

If Something Does Go Wrong While You Are Away

Even with thorough preparation, plumbing emergencies can occur. If your leak sensor fires, your property checker calls, or you receive any other indication of a plumbing problem at your home during your absence, here is the priority sequence:

First — if the main supply is on, arrange for someone to shut it off immediately. The main shut-off is the most important single action in limiting damage from any supply-side failure. Your trusted contact should know its location.

Second — contact 3rd Rock Plumbing at 828-324-0500. We work with homeowners who are away from their properties and are comfortable with door codes and other arranged access arrangements. We can assess the situation promptly and communicate clearly with you about what was found and what needs to happen next, so you can make informed decisions from wherever you are.

Third — if water damage has already occurred, document everything photographically before any cleanup begins. Insurance documentation is significantly more effective with photographic evidence of the original damage condition.

A Final Thought

Vacation is supposed to be the part of summer where you stop worrying about the house. Thorough pre-departure plumbing preparation is what makes that possible: because it systematically addresses the most common causes of vacation-period plumbing emergencies before you leave, rather than leaving them to chance.

The steps in this post take a few hours at most. The peace of mind they provide lasts the duration of your trip. 3rd Rock Plumbing is here to help Hickory-area homeowners leave with confidence, whether that means a pre-departure inspection, a supply line replacement, or simply answering a question before you head out. Call or text us at 828-324-0500 or visit 3rdrockplumbing.com/schedule-now to schedule service before your next trip.

Frequently Asked Questions: Preparing Your Plumbing Before Vacation

Should I shut off my main water supply before going on vacation? For trips of a week or longer, yes — shutting off the main water supply eliminates the risk of a pressurized supply line failure running undetected during your absence. For shorter trips the decision depends on the age and condition of your plumbing. When the main supply is shut off, always set the water heater to vacation mode or turn it off to avoid pressure buildup in a closed system.

What appliances should I turn off before leaving for vacation? Turn off the supply valves to the washing machine and dishwasher before any extended absence. These appliances have supply lines under continuous pressure and are among the most common sources of vacation water damage. Set the water heater to vacation mode regardless of trip length.

How do I check if my toilet is running before I leave? Flush each toilet and listen for the fill cycle to complete within about a minute. A toilet that continues to run after the tank should be full has a flapper or fill valve issue. Add food coloring to the tank — if color appears in the bowl after ten minutes without flushing, the flapper is leaking and should be repaired before departure.

What should I tell my neighbor or property checker before I leave? Give them the location of the main water shut-off valve, your contact information, and the name and number of your preferred plumber. Ask them to look for sounds of running water when no fixtures should be in use, moisture on ceilings or floors, unusual odors, and any pooling water near appliances or fixtures.

How do I prevent sewer gas from entering my home during a long absence? Run water briefly in every drain before leaving to ensure all P-traps are fully charged. For very long absences, adding a small amount of mineral oil to infrequently used drains slows evaporation of the P-trap water seal and maintains the barrier against sewer gas for a longer period.

Does 3rd Rock Plumbing help homeowners who have a plumbing problem while they are away? Yes. 3rd Rock Plumbing works with homeowners who are away from their properties and is comfortable with door codes and other arranged access arrangements. Call or text 828-324-0500 and we will assess the situation promptly and communicate clearly with you about what was found and what needs to happen — so you can make informed decisions from wherever you are.