Pool Leak Detection

You have been adding water to your pool twice a week. The autofill runs constantly. Your water bill crept up last month, and the chemical balance seems impossible to maintain. You tell yourself it is just evaporation — Hawaii is hot, the trade winds blow, water evaporates. But deep down, you know something is wrong. A pool that consistently loses more water than evaporation can explain has a leak, and ignoring it does not make it smaller. Koko Head Pool Service provides professional pool leak detection across Honolulu and Oahu, finding the source of your water loss accurately so it can be repaired before the damage and cost escalate.

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The Real Cost of Ignoring a Pool Leak

A pool leak is not just lost water. It is a chain of escalating problems that grows more expensive the longer it goes unaddressed:

Wasted water. Even a small leak — a quarter inch of pool water per day beyond normal evaporation — can waste thousands of gallons per month. In Hawaii, where water rates are already among the highest in the nation, that translates directly to your monthly bill.

Chemical waste. Every gallon of water that leaks out takes dissolved chemicals with it — chlorine, stabilizer, acid, salt. You are constantly replacing chemicals to maintain balance in water that is constantly draining away. For saltwater pools, you are also losing salt that costs money to replace.

Structural damage. Water escaping from underground plumbing or through structural cracks saturates the soil around your pool. Over time, this can cause:

• Soil erosion beneath the pool deck, leading to settling, cracking, and sinking
• Foundation undermining that compromises the pool shell itself
• Damage to nearby structures — retaining walls, patios, and even your home’s foundation
• Sinkholes in severe cases where persistent water flow washes away subsurface material

Equipment strain. A pool that constantly runs low forces your pump to suck air, which causes cavitation damage, overheating, and premature failure. The skimmer cannot function properly when the water level drops below the intake.

The math is simple: finding and fixing a leak now costs a fraction of what ignoring it costs over the next 6 to 12 months.

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Types of Pool Leaks

Pool leaks fall into three categories, and each requires a different diagnostic approach. After over 26 years of finding and fixing leaks across Oahu, Paul Costello has developed a systematic process for isolating each type.

Plumbing Leaks

The most common type. Your pool’s plumbing system includes suction lines from skimmers and drains, return lines from the filter back to the pool, and all the connections at the equipment pad.

Common plumbing leak sources:

• Equipment pad fittings — unions, valves, and PVC connections that loosen, crack, or deteriorate
• Underground pipe cracks — caused by ground shifting, root intrusion, or UV degradation of exposed sections
• Skimmer connections — the joint where the skimmer body meets the underground plumbing
• Main drain lines — cracks or separations in the plumbing running to the pool’s main drain
• Return line fittings — where return pipes connect to the wall fittings inside the pool

Plumbing leaks often start small and worsen over time as water pressure works against the damaged area.

Structural Leaks

These occur in the pool shell itself — the plaster, gunite, fiberglass, or tile that holds the water in.

Common structural leak sources:

• Cracks in plaster or gunite — caused by ground movement, settling, age, or improper construction
• Tile line separations — grout and mortar failures along the waterline tile allow water to seep behind the tile and into the deck or soil
• Coping joint failure — the expansion joint between the pool coping and the deck deteriorates, creating a path for water to escape
• Pool light niche — the housing where the pool light sits is sealed into the shell; if the conduit seal or niche itself fails, water leaks through
• Skimmer body cracks — the plastic or concrete skimmer can crack from impact, ground movement, or freeze-thaw cycles (less common in Hawaii, but still occurs from other stresses)

Equipment Leaks

The easiest to find but still important to address promptly.

Common equipment leak sources:

• Pump shaft seal — the seal where the motor shaft enters the pump housing wears out and allows water to drip
• Filter housing — clamp bands, tank o-rings, drain plugs, and pressure gauge ports can all develop leaks
• Heater connections — plumbing unions at the heater inlet and outlet, or internal heat exchanger leaks
• Salt cell housing — the unions and o-rings that seal the salt cell into the plumbing line
• Valve stems and handles — multiport valves, ball valves, and check valves can develop weeping leaks through seals and gaskets

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How We Find Your Leak

Our leak detection process is methodical. We do not guess, and we do not start digging until we know exactly where the problem is.

Step 1: Interview and Observation

We start by talking to you. How much water are you losing? How often do you add water? Is there a pattern — does the pool lose water only when the pump is running, or also when it is off? These details narrow the search significantly before we even open a toolbox.

Step 2: Visual Inspection

We walk the entire pool — the shell, tile line, coping, deck joints, skimmers, returns, lights, and equipment pad. Many leaks leave visible clues: damp spots on the deck, cracks in the plaster, white calcium deposits around fittings, eroded soil near the pool, or dripping connections at the equipment pad.

Step 3: Equipment Pad Testing

We inspect every fitting, union, valve, pump seal, filter connection, and plumbing joint on the equipment pad. Equipment leaks are the most common and the simplest to repair, so we rule them out first.

Step 4: Static vs. Running Loss Test

We determine whether the pool loses water with the pump running, with the pump off, or both. This tells us whether the leak is on the suction side (pump off loss), return side (pump running loss), or in the shell (loss in both conditions).

Step 5: Dye Testing

For suspected structural leaks — cracks, tile separations, light niches, skimmer joints — we use dye testing. A small amount of colored dye released near the suspected area will be drawn toward a leak by the escaping water flow. This non-invasive method pinpoints the exact location of shell and fitting leaks without any damage to the pool.

Step 6: Pressure Testing

For suspected plumbing leaks, we can pressure test individual lines by isolating and pressurizing each pipe section. A line that will not hold pressure has a leak. This method locates underground plumbing leaks without excavation during the diagnostic phase.

Step 7: Repair Plan

Once the leak is located, we provide a clear explanation of the problem, the repair method, and the cost. For simple equipment pad or fitting repairs, we can often fix the leak during the same visit. For underground plumbing or structural repairs, we provide a detailed plan and schedule.

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Signs Your Pool Has a Leak

If you notice any of these symptoms, call us for a leak inspection:

• Water level dropping more than half an inch per day (beyond normal evaporation)
• Autofill system running constantly or nearly so
• Higher than normal water bill without a change in other water use
• Difficulty maintaining chemical balance — chemicals seem to disappear faster than expected
• Air in the pump basket when the system is running — may indicate a suction-side plumbing leak
• Wet or soggy spots in the yard near the pool, deck, or equipment pad
• Cracks in the pool deck — settling caused by water erosion underneath
• Algae growth despite proper chemistry — a leak can introduce contaminants and dilute sanitizer
• Loose or shifting tiles along the waterline
• Standing water around the equipment pad when it has not rained

Do not wait for the problem to get worse. Call 808-399-4388 at the first sign of unusual water loss.

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The Bucket Test — A Simple Home Check

Before you call us, you can confirm whether your water loss exceeds normal evaporation with a simple test:

1. Fill a bucket with pool water and set it on a pool step so it is partially submerged
2. Mark the water level inside the bucket and on the pool wall at the same height
3. Wait 24 hours — do not swim, do not run the autofill, and leave the pump on its normal schedule
4. Compare the levels — if the pool dropped more than the bucket, the pool is leaking (both experienced the same evaporation conditions, so the difference is leak loss)

If you confirm a leak, the next step is calling us for professional detection. The sooner a leak is found, the less damage it causes and the less it costs to repair.

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Hawaii-Specific Leak Factors

Pools in Hawaii face leak risks that mainland pools do not:

Volcanic soil movement. Hawaii’s geology is not static. Subtle soil shifts, settling, and compaction can stress underground plumbing joints and pool shell connections over time, creating cracks that let water escape.

Salt air corrosion. Metal fittings, clamps, and connections on the equipment pad corrode faster in Hawaii’s salt-laden air, leading to weeping leaks at joints that were tight when installed.

Root intrusion. Hawaii’s aggressive tropical vegetation — banyan roots, palm roots, plumeria roots — can grow into or around underground pool plumbing, cracking pipes or shifting their alignment.

Year-round UV exposure. Exposed PVC pipe, rubber gaskets, and sealants degrade faster under constant UV radiation, becoming brittle and prone to cracking.

High water table in coastal areas. In low-lying areas near the coast, a high water table can complicate leak detection by masking the signs of water escaping from the pool shell.

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Leak Repair Across Oahu

We provide pool leak detection and repair throughout Honolulu and across Oahu:

• Hawaii Kai — our home base since 1995
• Portlock — oceanfront properties with high salt exposure
• Kahala — trusted by Kahala families for decades
• Diamond Head — from Kapahulu to the Gold Coast
• Aina Haina — fast response for our East Honolulu neighbors
• Greater Honolulu and Oahu — call to confirm service in your area

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Related Services

Leak detection often connects to other services we provide:

• Pool Equipment Repair — repair for pumps, filters, heaters, and all pool equipment, including equipment-related leaks
• Residential Pool Service — weekly maintenance that catches water loss and leak symptoms early
• Emergency Pool Repair — when a major leak requires urgent attention

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Stop Losing Water and Money

Every day a leak goes unrepaired, you are paying for water that drains into the ground, chemicals that wash away, and potential structural damage that compounds. Call 808-399-4388 and talk to a CPO-certified technician with over 26 years of experience finding and fixing pool leaks across Oahu. We find the source, explain the problem, and repair it right — so you can stop worrying and start enjoying your pool again.

Koko Head Pool Service — family-owned since 1995, CPO certified, and trusted across Oahu for accurate, honest pool leak detection and repair.