Phoenix Pool Water Loss: Evaporation or Leak?

In Phoenix, a falling pool level is not automatically a leak: heat, dry air, wind and exposed water surface all contribute to evaporation. Arizona Water Facts reports that an average pool evaporates roughly its entire 16,000-gallon contents over a year and describes Phoenix-area evaporation as about six feet of water depth annually; actual loss varies with pool size, exposure and weather. Track your own refill rather than treating a statewide average as a prediction.

Separate Evaporation from a Possible Leak

Compare the pool with a water-filled bucket placed on a step, keeping both exposed to similar conditions and equipment off as appropriate. A persistent difference beyond normal variation can justify a professional leak test. Check plumbing, fittings and the equipment pad as well as the shell.

• Record water level at the same time each day for several days.
• Note wind, temperature, splash-out and automatic refill operation.
• Meter makeup water if practical and investigate sudden changes.

Reduce Loss and Manage Refills

Arizona Water Facts says a pool cover can save 90–95% of water otherwise lost to evaporation, though actual savings depend on regular use and fit. Wind screens and lower splash-out can also help. When draining or refilling in Phoenix, review the City’s disposal guidance and your water bill; sewer-fee adjustments have rules and deadlines.

Protect Your Phoenix-area Pool

If water loss remains unexplained in Tempe or Mesa, arrange a leak assessment before resurfacing. A new finish cannot fix a plumbing leak, and proper diagnosis can prevent repeat draining. Contact a Phoenix-area pool professional to plan the work.