Leaving the Phoenix metropolitan area during the peak of summer is a ritual for many families looking to escape the 115°F heatwaves. Whether you are heading coastward for two weeks or becoming a “seasonal traveler” for two months, leaving your home vacant in the middle of an Arizona summer requires more than just locking the doors and setting the thermostat.
An unmonitored plumbing leak in a vacant house under extreme desert heat can lead to catastrophic structural damage, toxic mold growth, and a ruined foundation within days. At APS Plumbing, we receive dozens of emergency calls from homeowners returning to a flooded house. Before you pack your bags, use this 2026 expert plumbing checklist to secure your home.
1. The Core Protection: Shut Off the Main Water Valve
The single most effective defense against a home flood while you are away is cutting off the water supply at the source.
- The Action: Locate your main interior water shut-off valve (usually inside the garage, utility closet, or near the front outdoor water line). Turn the handle clockwise until it is fully closed.
- The Pressure Release: After shutting off the main valve, go inside and open the highest and lowest faucets in the house to drain the residual pressure remaining in the lines.
- The Exception: If you have an outdoor irrigation system or a pool auto-fill that must run while you are gone, do not shut off the main water line to the whole property. Instead, isolate and shut off the dedicated interior water valves feeding your bathrooms, kitchen, and laundry room.
2. Water Heater Management: “Vacation Mode”
Leaving your water heater running at standard temperatures while nobody is home is a massive waste of energy and subjects the tank to unnecessary high-pressure strain.
- For Tank Heaters: Turn the dial on your gas or electric water heater to the “Vacation” (VAC) setting. This drops the water temperature down, preventing the burner from cycling constantly while maintaining enough warmth to stop mineral calcification.
- For Tankless Heaters: Modern tankless systems like Navien or Rinnai can simply be powered down or put on standby mode via their digital control panel or mobile apps.
- Internal Link: Thinking of upgrading before your trip? Read our Best Tankless Water Heaters for Arizona Hard Water Guide.
3. Lock Down Outdoor Irrigation and Pool Systems
In cities like Scottsdale, Mesa, and Gilbert, outdoor systems cannot be shut off entirely during summer without destroying your landscape investment.
- The Inspection: Check your irrigation timers to ensure they are set to early morning hours to prevent excessive evaporation. Inspect all drip lines for pinhole cracks that could blow out while you are away.
- Pool Auto-Fills: Ensure your pool’s auto-fill valve float is adjusted correctly. If it gets stuck open, it will continuously dump water into your pool, spiking your bill and risking a major backyard overflow.
- Internal Link: Suspect an issue with your pool lines already? See our guide on How to Detect Hidden Water Leaks in Arizona Summers.
4. Protect Your Drains from Evaporation and Sewer Gas
Every sink, shower, and floor drain in your home features a “P-trap”—a curved pipe that holds a small pool of water to block sewer gases from rising into your living spaces.
- The Desert Risk: In Arizona’s extremely dry summer air, the water inside unused P-traps can evaporate completely in less than two weeks. This allows toxic, foul-smelling sewer odors to fill your vacant house.
- The Pre-Trip Fix: Pour a cup of water down every unused drain (guest showers, laundry sinks) right before you leave. To slow down evaporation significantly, add a tablespoon of mineral oil or cooking oil to the drain—the oil creates a thin barrier on top of the water, preventing evaporation while you are away.
The Pre-Vacation Plumbing Checklist Summary
Use this quick summary sheet on the day of your departure:
- [ ] Main Line / Appliance Shut-off: Turn off main valve or isolate individual fixtures (washers, toilets).
- [ ] Water Heater: Set tank units to “VAC” mode; put tankless units on standby.
- [ ] Water Dispersal: Open internal taps briefly after shut-off to bleed system pressure.
- [ ] Drain Preservation: Add water and a drop of mineral oil to all P-traps and floor drains.
- [ ] Sump Pump & Softener: Test your sump pump (if applicable) and ensure your water softener has fresh salt pellets.
- [ ] Irrigation Audit: Confirm automated lawn timers and pool auto-fills are calibrated correctly.
Schedule a Pre-Trip Plumbing Audit with APS Plumbing
If you are planning to be away from your home in Maricopa County for an extended period, peace of mind is invaluable. Don’t leave your home’s integrity to chance.
At APS Plumbing, we offer rapid “Travel-Ready” plumbing inspections. Our licensed professionals will check your main valves, inspect your PRV for summer thermal strain, audit your water heater, and ensure your system is entirely secure before you pull out of the driveway.
Enjoy your vacation without the plumbing anxiety. Contact APS Plumbing today to schedule your seasonal checkup and keep your home protected while you enjoy the cooler weather.
Preparing home plumbing for a summer vacation in Arizona requires preventing dry-weather pipe leaks and system failures. The essential checklist includes shutting off the main water valve (or individual appliance isolation valves), placing the water heater into “Vacation Mode,” checking pool auto-fill line integrity, and treating unused P-traps with water and mineral oil to halt evaporation and block sewer gases in the arid Phoenix climate.
FAQ
- Q: Should I turn off my main water valve when going on summer vacation in Phoenix?
- A: Yes. Turning off the main water valve is the safest way to prevent accidental flooding. However, if your landscaping irrigation or pool auto-fill depends on that main line, you should isolate individual indoor shut-off valves (toilets, washing machines, sinks) instead.
- Q: Why does my house smell like sewage when I return from vacation in Arizona?
- A: This happens because the extreme dry heat accelerates the evaporation of water inside your drains’ P-traps. Without water acting as a seal, sewer gases travel freely up into your home.
