Pool leak vs slab leak testing: what to know in Arizona
A pool in the Arizona summer loses water to evaporation every day, and an auto-fill valve quietly replaces it. That makes the meter and the bill rise in a way that looks like a leak, even when nothing is wrong.
A real leak in the pool shell or its plumbing behaves differently from one under the house. Sorting out which is which saves a detection visit in one case and points the right trade in the other.
Slab leak signs people notice
Tell the dispatcher the year the home was built and whether there is a pool.
Speak With Someone LocalWhy Arizona homes get slab leaks
Many Valley lots pair a pool with a long service line, so the pool fill line, the yard and the house all draw from the same meter. Evaporation in July can be considerable, and a pool that looks fine can still be topping itself up.
Because the signals overlap, the useful question is which signs are present. Indoor signs such as warm tile or running sounds belong to the house.
What you can safely observe
Note the waterline against a tile line in the morning and again the next morning. Write down the weather. Watch the meter with the house quiet and the irrigation controller off.
Do not turn equipment off, open pool plumbing or dig. If a drop looks more than evaporation, mention it on the call and contact a pool professional.
What a leak detection technician does
A technician tests the house side separately from the yard, so a leak under the slab is shown or ruled out whatever the pool is doing. If the isolation points at the pool or its lines, you will be told and the visit ends there.
Pool leak detection and repair belong with pool trades.
The contractor gives you a quote, and nothing starts until you agree to it.
Need a Leak Located? Call UsTelling a pool leak from a slab leak in more detail
A pool loses water every day in an Arizona summer. Sun, wind and dry air pull a surprising amount off the surface, and a pool that sits a little lower after a hot week is usually doing what pools do. A leak is a loss that keeps going when the weather is mild, when the pool has not been used, or when the level drops by more than the same stretch of days would explain.
The useful observation is a pattern, not a single reading. Note where the waterline sits against the tile in the morning, look again the next morning, and write the two down. Do this across a few days and across a hot day and a cooler one. A steady loss that tracks the heat points one way. A loss that is the same in any weather points another.
The reason this matters on a slab leak call is that both problems can show up as a higher bill. A pool that is being topped up by an auto-fill can hide its own loss behind a float valve, and the extra water shows up on the meter. That meter movement can look exactly like a leak under the house. Mentioning an auto-fill to the technician saves time.
The house side of the picture is different. A slab leak tends to leave signs inside: a warm patch on a tile floor, a hiss near a wall, damp baseboards, a water heater that never seems to rest. A pool leak leaves none of those. If the meter moves with everything off and the pool level is steady, attention goes to the lines under and around the house.
It is also possible to have both at once, and that is not unusual in older Valley neighborhoods with pools. The order of work does not change. The technician separates the house lines from the outdoor lines first, tests each, and reports which ones hold pressure and which ones do not. Anything that points to the pool itself is passed back to the homeowner as something for a pool trade to look at.
This service handles leaks in water lines under the slab. It does not repair pools, pool plumbing or equipment, and you are never asked to touch pool equipment. Watching the waterline is the whole of the homeowner side.
Telling them apart
A pool auto-fill hides a pool leak by topping it up. That can move the meter and raise the bill with nothing wrong under the house.
Mark the waterline against the tile and check it after a day. If the level drops more than you would expect, the pool may be losing water.
If the pool level holds and the meter still moves with everything off and the irrigation off, the house side is the more likely source.
We do not repair pools. If the pool is the source, the technician says so.
Pool equipment and the lines around it
Pools have their own plumbing: lines from the skimmer and drains to the pump, and return lines back to the pool. A leak in any of these can make the water level fall without showing on the deck. We do not repair pools or their equipment, but knowing they exist helps when reading the results of the waterline check.
The auto-fill line is part of the house supply. It draws water through the meter to top up the pool. If the pool is losing water, the auto-fill keeps the level steady and the meter keeps moving, which can look like a slab leak.
If you can switch the auto-fill off, the waterline check becomes clearer. A falling level with the auto-fill off points to the pool. A steady level with the meter still moving points elsewhere.
Evaporation is normal, especially in summer. A small daily drop is expected. A drop that seems large for the weather, or one that continues after a cool, still night, is the one to mention.
If the waterline check suggests the pool is the source, the technician says so and suggests a pool specialist. If the pool holds and the meter moves, the house side is checked next.
Earlier leaks, where they were and what was done, help the technician plan.
Warm Tile Underfoot? Call NowQuestions about pool leaks and slab leaks
How much evaporation is normal?
It varies with heat, wind and surface area. Compare it against a normal week and tell the technician what you saw.
Can you fix the pool if it is leaking?
No. We handle slab leaks only.
Does a leaking pool cause a slab leak?
They are separate systems. A pool leak does not create a leak in the house lines.
Should I turn off the auto-fill?
We do not ask homeowners to adjust pool equipment. Observing the level is enough for a first read.
Does evaporation explain a pool that drops a little each day?
Often, yes. In summer heat and wind, a pool can lose a noticeable amount from the surface alone. A leak is a loss that keeps going when weather would not account for it.
Can an auto-fill hide a pool leak?
It can. The float valve tops the pool up, so the level looks steady while the meter moves. Tell the technician if your pool has one.
Will you test the pool plumbing?
No. The aim is to decide whether the water loss is inside the house lines. Pool plumbing and equipment are for a pool trade.
How many days should I watch the level?
Two or three mornings in a row gives a clearer picture than one. Write the waterline position down each time.
What if the pool is steady and the meter still moves?
Then the house lines, the line from the meter to the house, and any outdoor lines come next. That is where a slab leak call usually starts.