Pool and spa leaks · Gilbert
Pool and spa leak detection in Gilbert
When a spa spills into the pool and both share the same pump, a loss anywhere in the system looks exactly like a loss in the pool.
Gilbert's median year of construction is 2002, with 59 percent of its housing built since 2000 and 83 percent of it single-family. Pools of that generation are commonly built with an attached spa on shared equipment, which is what makes the diagnosis here distinctive.
Pool leak detection in Gilbert usually means testing the pool and the attached spa as two separate vessels on one set of equipment, because a combined system that loses water says nothing about which part of it is at fault.
| Pool leaks in Gilbert | What that means here |
|---|---|
| Median year built | 2002, with 59 percent of housing built since 2000 |
| The usual arrangement | Pool and attached spa on shared equipment, with a spillway between them |
| Why that matters | A spa losing water refills from the pool across the spillway, so the pool is what appears to be dropping |
| Free first step | Gilbert is one of ten Valley cities publishing the Smart Home Water Guide, a step-by-step guide to finding a household leak |
Housing shares from U.S. Census Bureau, American Community Survey 5-year estimates (2023). The Smart Home Water Guide is published jointly by ten Valley cities through the Arizona Municipal Water Users Association.
Why does an attached spa make a pool leak harder to read?
Because the two vessels are hydraulically connected and the pool is the larger of them. A spa that is losing water through its own shell, fitting or plumbing is topped back up across the spillway or through the shared circulation, so what you observe is the pool going down while the spa looks perfectly stable.
Separating them is the first real step. With the equipment configured so each vessel stands alone, both are measured independently over the same period, and it becomes obvious which one is actually losing water — or whether the loss is in the plumbing they share.
What are the three sets of plumbing on a shared system?
The pool's own suction and returns, the spa's, and the shared lines between the equipment and both. Each can fail independently, and each is isolated and pressure-tested in turn rather than assessed as one circuit.
That is also why the valve configuration at the pad is written down before anything is changed. A system that has been switched between modes for testing has to be put back exactly as it was, and on a combined installation that is not always obvious afterwards.
What can you do before calling anyone?
Run the check the Smart Home Water Guide describes, which Gilbert co-publishes with nine other Valley cities. Close every tap and appliance valve, shut the irrigation, shut the pool auto-fill, and watch the meter's low-flow indicator; if it still moves, something on your side is losing water and the guide walks through narrowing it down.
Do newer pools leak through the shell?
Rarely. On a pool built in the 2000s the shell and plaster are generally well within their service life, so the candidates are the penetrations and the plumbing: the skimmer throat, return fittings, main drain, light niche conduit, and the joints beyond them. Each is checked with the water still and the equipment off, without draining anything.
Straight answers
Pool leak questions we get in Gilbert
The pool drops but the spa never does. Does that clear the spa?
No, and it is often the opposite. A spa that shares equipment and spills into the pool is continuously topped up from it, so a spa leak shows as a falling pool and a stable spa. Testing each vessel in isolation over the same period is what tells the two apart.
Can you test the pool without changing the equipment settings permanently?
Yes. The valve positions are recorded before anything is altered and restored afterwards, because a combined pool and spa installation can be left running in the wrong mode without it being obvious. Testing requires temporary changes; it does not require the system to be left different.
Where do I start if I just know the bill went up?
With the Smart Home Water Guide that Gilbert helps publish, and with your meter. Shut everything inside, the irrigation and the pool auto-fill, then watch the low-flow indicator. Movement means a loss on your side, and the next step is isolating one system at a time until it stops.
Pool leaks near Gilbert
Gilbert pool dropping and the spa looks fine?
Tell us whether the spa spills into the pool and shares the same pump.
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