How do you find where a pool is leaking?

Pool leaks are usually found by checking the most common failure points in order: equipment and plumbing first, then the pool shell. Most leaks are in the pump, filter, valves, or return lines because they are easiest to test and repair. The most common leak locations include: - **Pump and filter assembly** - leaking seals, unions, or O-rings ($50-$400 to repair) - **Suction and return lines** - cracked or separated pipes, often under the deck ($300-$1,500) - **Skimmer and returns** - cracks around fittings or gaskets ($200-$800) - **Light niches and fittings** - failed seals ($300-$900) - **Plaster or tile cracks** - hairline or structural cracks in the shell ($1,000-$5,000+) A leak detection specialist will typically perform pressure testing on the plumbing lines first before inspecting the shell.

How much does it cost to have a pool leak detected?

Pool leak detection in the Phoenix area typically costs between $150 and $600, depending on the method and how hard the leak is to find. Simple bucket tests and visual inspections are the cheapest, while electronic or pressure testing costs more. | Method | Typical Cost (Phoenix) | What It Finds | |--------|------------------------|---------------| | Bucket test | $0-$50 (DIY) | Confirms whether water loss is from the pool or evaporation | | Visual inspection and dye test | $150-$350 | Surface and fitting leaks, skimmer and light niche issues | | Pressure test (plumbing) | $200-$450 | Leaks in underground or return lines | | Electronic leak detection | $300-$600 | Hard-to-locate leaks in pool shell or plumbing | | Combined diagnostic visit | $400-$800 | Full evaluation including equipment and shell |

Why is my pool losing water even though there is no leak?

Pool water loss without an obvious leak is most often caused by evaporation, splash-out, backwash, or filter issues. In Phoenix's heat and low humidity, evaporation can be significant, especially in summer and during windy periods. Common non-leak causes include: - **Evaporation** - 1/4 to 1/2 inch per day in summer ($0 to fix, normal loss) - **Splash-out** - from heavy use, wind, or water features ($0 to reduce) - **Backwashing** - removing water during filter cleaning ($0-$50 per cycle) - **Overflowing or misaligned skimmer weirs** - water leaking out unnoticed ($0-$100 to adjust) - **Improper water level** - pool set too high for skimmer operation ($0 to adjust) If losses exceed normal evaporation, test for a hidden leak.

Where is the most common place for a pool leak to occur?

The most common leak locations are in the plumbing and fittings, especially around the equipment pad, pump, filter, and return lines. Skimmers, main drains, and light niches are also frequent problem spots. Common leak sources include: - **Equipment pad and plumbing unions** — Cracked unions, valves, and fittings from heat cycling are a leading cause. - **Skimmer connections** — Gaps where the skimmer meets the shell often leak as the surrounding soil shifts. - **Return and suction lines** — Underground pipes can crack from ground movement or age. - **Light niches** — Worn seals around underwater lights can let water escape. - **Main drain** — Cracks or failed fittings at the drain can cause slow losses.

What is the lifespan of an inground pool?

An inground pool structure can last 25 to 50 years or more with proper care, but the surface and equipment wear out much sooner. In Arizona's intense sun and hard water, the surface finish is the component most likely to need replacement first. | Component | Typical Lifespan in Arizona | |---|---| | Pool shell (gunite or fiberglass) | 25-50+ years | | Plaster finish | 10-15 years | | Pebble or quartz finish | 15-20 years | | Vinyl liner | 5-9 years | | Pump and motor | 8-12 years | | Heater | 8-12 years | | Pool tile | 10-20 years | Regular chemical balancing and weekly service help extend the life of every component.

Is it normal to lose 2 inches of water out of a pool?

It depends on the time period and the weather. In Phoenix, evaporation alone can remove roughly 1/4 inch or more per day in summer heat, so losing 2 inches over a week in June or July can be normal. Losing 2 inches over a cooler month or a few days in winter is more likely a sign of a leak. A simple way to check: 1. Fill a bucket with pool water and set it on the top step, with the water line matched to the pool. 2. Mark both water levels and let it sit for 24 to 48 hours. 3. If the pool drops about 1/4 inch or more than the bucket, you likely have a leak.

How do you fix a leak in a pool without draining it?

Many pool leaks can be repaired without draining the pool, especially those in equipment, skimmers, returns, and light niches. Leaks in the plumbing lines or shell often need the water level lowered below the damaged area, but a full drain is usually not required. Structural shell repairs may need the pool drained or partially drained. Common no-drain repairs include replacing pump seals, tightening unions, applying underwater epoxy to small cracks, and replacing skimmer gaskets. Underwater hydraulic cement can also seal some small shell cracks. In Arizona, pool contractors should hold a valid ROC CR-6 or R-6 license for pool repair work.

How to detect pool leaks in an inground pool?

Start with a bucket test: fill a bucket with pool water, mark the water level inside and outside the bucket, set it on the top step, and check after 24 hours. If the pool drops more than the bucket, you likely have a leak. For a more precise check, a licensed leak detection specialist can use dye testing, pressure testing of plumbing lines, or acoustic listening equipment to pinpoint the source. In the Phoenix area, evaporation alone can lower a pool 1/4 to 1/2 inch per day in summer, so compare results carefully and run the test with the pump off.

Service · Phoenix metro

Pool Leak Detection and Repair

Locating and fixing leaks in pool shells, plumbing lines, skimmers, and equipment using pressure testing and electronic detection.

42 listed Valley companies say they do this.

See the 42 companies

Expert pool leak detection and precision repair services for you

Losing water?

Leak, or just Phoenix?

In a hot, dry, windy week the sun and wind take a lot from open water. Tell us how far your pool dropped and we’ll set it beside what the weather accounts for this week. Then do the bucket test: fill a bucket with pool water, set it on the first step, and mark the level inside and outside. After a day, if the pool dropped more than the bucket, something besides evaporation is taking water.

The full bucket test, step by step

My pool dropped inches in 7 days

Reading the week’s weather…

Find leak detection Weather: AZMET (University of Arizona), Phoenix Encanto station. Coefficient: FAO-56 Table 12, open water under 2 m deep.

Water Loss Won't Fix Itself

A pool leak keeps draining while you guess. Find the source before the water bill, the soil and the equipment pay for it.

Pressure testing pinpoints the failing line
Detection and repair are separate steps
A valid ROC licence comes first

Common problems

Signs You May Have a Pool Leak

Leak detection and repair means locating and fixing leaks in shells, plumbing lines, skimmers and equipment, using pressure testing and electronic detection. Finding the leak and fixing it are two separate jobs. A pool line repair is one common outcome.

Leaks tend to show up where two materials meet, such as the skimmer, drains, returns and tile line.^[1] Equipment connections are another usual suspect.

Pool pump and filter with plumbing on a backyard equipment pad — A pool equipment pad with pump, filter and plumbing connections

Watch for:

Water level dropping faster than evaporation explains
An auto-fill that never stops running
Wet soil or soggy ground near the equipment pad
Visible cracks or air bubbles in the lines

In Phoenix, summer heat makes evaporation hard to separate from a leak. The bucket and dye tests are the first checks, and why your pool is losing water walks through both.

A leak that appears only while the pump runs points to a different part of the system than one that continues with it off. That is why pros pressure test.

Sound familiar? The level drops every week. You top it off and blame the heat. Then the soil by the equipment turns soft, and the repair is bigger than it needed to be.

Waiting lets water erode the soil around the shell and plumbing. It also leaves the pump running while it pulls air.

How serious is it

Level 1 of 3: Early
Signs Water level drops faster than evaporation explains
What to do Run the bucket and dye tests
Level 2 of 3: Developing
Signs Auto-fill never stops running, or air bubbles show in the lines
What to do Book pressure testing and electronic detection
Level 3 of 3: Serious
Signs Wet, soggy soil near the equipment pad
What to do Stop topping off and get the leak located and repaired

What it costs

What Affects Leak Repair Cost

Price depends on leak location, access, detection time and repair scope. A leak under decking or plaster that must be opened costs more than a loose fitting at the pad.

Price factors

What moves the price

Leak location
Under decking or plaster costs more than a loose fitting at the pad
Access
Opening decking or plaster adds to the job
Detection time
More testing time raises the detection charge
Repair scope
Small fixes and large repairs sit far apart in price

The figures below come from Phoenix-area pool companies' own websites, checked October 2026, plus one industry source.

Item	What the sources say
Diagnostic or service-call fee	Most Phoenix companies list $85 to $95
Equipment repair labour	One Phoenix company's site says $80/hour plus parts, 30 minute minimum
Basic leak screening	$100 to $200^[2]
Standard detection with pressure testing	$300 to $500^[2]
Professional detection assessment, overall	$150 to $500^[2]
Swimming pool repairs, general	One Phoenix company's site says $100 to $20,000
Opening decking or plaster	Depends on the job

That repair spread shows why a single number means little. These are one company's guidance, not a quote.

Ask for an itemised written quote that lists detection and repair separately. That way you can compare bids in Mesa or Chandler line by line.

Pro tip

Ask each contractor to quote detection and repair as separate lines, so you can compare like with like.

602 Pool Pros

Permit rules for leak repairs are not confirmed for Phoenix, Mesa or Scottsdale. Ask the contractor and your city's permit office before work starts.

What to expect

How Leak Detection and Repair Works, Step by Step

A leak job runs in six steps, from confirming the loss to final paperwork.

Step by step

The six steps at a glance

Confirm the loss
Rule out evaporation and check visible equipment.
Pressure test
Isolate each line to find the one losing water.
Pinpoint the spot
Acoustic gear or dye locates the exact point.
Match the fix
Repair the line, skimmer seal or shell crack.
Recheck
Retest the pool to confirm the loss has stopped.
Paperwork
Get the contract in writing and confirm the permit.

Finding the leak

Confirm the loss. The tech verifies the water drop is not evaporation, then inspects visible equipment, skimmers and the tile line.
Pressure test the lines. Each plumbing line is isolated to find which one is losing water.
Pinpoint the spot. Acoustic equipment, hydrophones or dye testing locate the exact point.^[1]

Repairing it

Match the fix to the location. That could be a line repair, skimmer resealing or shell crack repair. Caliche under many Gilbert and Peoria yards can make digging to a buried line slow work.
Recheck. The pool is retested to confirm the loss has stopped.
Paperwork. Get the contract in writing and confirm who pulls any permit.

Summer is the busy season for pool equipment failures, so winter often has more open scheduling.

Backyard pool with clear water after a completed repair — A pool after repair, with clear water and a finished deck

Choosing a company

How to Verify an Arizona ROC Licence for Leak Work

Arizona requires an ROC licence for pool repair. R-6 or CR-6 covers service and minor repair. B-5, B-6, KA-5 or KA-6 cover broader work. The licence class guide explains which fits your job.

Search the contractor on the ROC Contractor Search at roc.az.gov and confirm:

The licence is active
The class covers the work you need
Bond and Recovery Fund status

R-6 excludes potable-water plumbing connections, gas lines and electrical work beyond the first disconnect. Confirm class fit before agreeing to line work.

"Licensed, bonded and insured" in an ad proves nothing. ROC requires only workers' compensation insurance, and an unlicensed hire leaves you without ROC recourse. See what that phrase covers.

Also ask these questions of every contractor before you hire, and tick them off as you go:

Checklist

Questions to ask each contractor

0 of 3 ticked

Do you quote detection and repair separately?
Who pulls the permit, if one is needed?
Is the recheck included?

Tick them off as you go. Nothing is saved or sent.

Compare the licensed pros serving Scottsdale, Tempe and the rest of the Valley below.

Questions Valley pool owners ask

Pool leaks are usually found by checking the most common failure points in order: equipment and plumbing first, then the pool shell. Most leaks are in the pump, filter, valves, or return lines because they are easiest to test and repair.

The most common leak locations include:

Pump and filter assembly - leaking seals, unions, or O-rings ($50-$400 to repair)
Suction and return lines - cracked or separated pipes, often under the deck ($300-$1,500)
Skimmer and returns - cracks around fittings or gaskets ($200-$800)
Light niches and fittings - failed seals ($300-$900)
Plaster or tile cracks - hairline or structural cracks in the shell ($1,000-$5,000+)

A leak detection specialist will typically perform pressure testing on the plumbing lines first before inspecting the shell.

Pinch A Penny. "Pool Leak Detection & Repair." https://pinchapenny.com/services/pool-leak-detection. Accessed October 17, 2026.
PoolFounder. "Pool Leak Detection for Service Companies." https://www.poolfounder.com/pool-leak-detection-for-service-companies. Accessed October 17, 2026.

Top-graded for leak detection

All 42

AExcellent

San Tan Valley, AZ

ASP - America's Swimming Pool Company of Queen Creek

Pool service
Pump repair
Pool repair
+3 more

Google: 4.8 · 225
In business: 21 yrs
ROC no.: Listed

Request an estimateCompare

AExcellent

Scottsdale, AZ

Leak Science LLC

Leak detection

Google: 4.9 · 284
In business: 20 yrs
Posts prices: Yes

Request an estimateCompare

AExcellent

Serves the Valley

ASP - America's Swimming Pool Company of Mesa

Pool service
Pump repair
Pool repair
+3 more

Google: 4.6 · 394
In business: 21 yrs
ROC no.: Not listed

Request an estimateCompare

Leak, or just Phoenix?

Common problems

Signs You May Have a Pool Leak

What it costs

What Affects Leak Repair Cost

What to expect

How Leak Detection and Repair Works, Step by Step

Finding the leak

Repairing it

Choosing a company

How to Verify an Arizona ROC Licence for Leak Work

Questions Valley pool owners ask

How do you find where a pool is leaking?

How much does it cost to have a pool leak detected?

Why is my pool losing water even though there is no leak?

Where is the most common place for a pool leak to occur?

What is the lifespan of an inground pool?

Is it normal to lose 2 inches of water out of a pool?

How do you fix a leak in a pool without draining it?

How to detect pool leaks in an inground pool?

Top-graded for leak detection

ASP - America's Swimming Pool Company of Queen Creek

Leak Science LLC

ASP - America's Swimming Pool Company of Mesa

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