Your Berwick pool is losing water: what it means and what repairs cost
If your pool is dropping 3 mm to 7 mm a day in summer, evaporation may be all it is. If it drops 20 mm to 40 mm a day, stops at a fitting, bubbles through the returns, or leaves wet ground near the equipment pad, budget $350 to $1,500 for testing and $450 to $6,500 for common repairs.
Leak symptoms, urgency and likely repair cost
| Symptom | Likely cause | How urgent | Likely 2026 cost |
|---|---|---|---|
| Water drops 3 mm to 7 mm a day in hot weather | Evaporation, wind, splash-out | Not urgent, test before booking | $0 if bucket test confirms evaporation |
| Water drops 20 mm to 40 mm a day | Active leak in shell, pipe or fitting | Book same week | $350 to $1,500 detection, then repair cost |
| Water stops falling at skimmer or light level | Skimmer throat, light niche, return fitting | Book within 1 to 2 weeks | $450 to $2,500 for common fitting repairs |
| Air bubbles in returns and pump basket will not fill | Suction-side leak, pump lid, valve or pipe | Same week, avoid running dry | $250 to $900 visible repair, $1,500 to $4,500 underground line |
| Wet patch near equipment pad | Pressure-side leak, filter waste, cracked valve | Same week if pump is running daily | $350 to $1,800 for pad repairs |
| Cracks, hollow render, staining and constant water loss | Concrete shell or interior finish failure | Plan repair, urgent if movement is active | $900 to $4,500 isolated repair, $18,000 to $35,000 resurfacing |
| Water disappears only after backwashing | Multiport valve or waste line leaking | Can wait days if valve is isolated | $180 to $850 for valve or seal work |
What you can safely test yourself
Start with a bucket test. Fill a bucket with pool water, place it on a step so the water inside the bucket is close to the pool level, mark both levels, then leave the pump off for 24 hours. If the pool and bucket drop by the same amount, it is probably evaporation. If the pool drops much more than the bucket, you have a leak worth investigating.
Run a second 24 hour test with the pump on if the first result is unclear. A leak that gets worse when the pump runs often points toward pressure-side plumbing, equipment pad valves or the filter waste line. A leak that gets worse when the pump is off can point toward the shell, fittings or suction-side pipework. These tests cost nothing and can save a wasted call-out.
Check the simple things before paying for leak detection. Look for water running from the waste pipe when the filter is on recirculate or filter. Check the pump lid o-ring, unions, drain plugs and visible valves. Make sure the autofill, if fitted, is not hiding the leak by constantly topping up the pool. If your water bill has jumped and the pool always looks full, turn the autofill off and mark the waterline.
Do not use food dye around lights or fittings if you are uncomfortable being in the water, and do not open electrical equipment. Pool lights, bonding and wet-area power are not DIY territory. If the pump is drawing air, switch it off until someone has checked it. A burnt-out pump motor or damaged mechanical seal can add $600 to $2,400 to a problem that may have started as a small suction leak.
Leaks that can wait a season, and leaks that cannot
A slow cosmetic leak in a water feature that is isolated and not undermining paving can often wait until the next renovation program. A tiny weep from an unused solar line may be capped and dealt with later. If your old concrete pool is due for resurfacing next winter, patching every small interior defect now may be poor value.
Same-week jobs are different. Any leak that draws air into the pump, drops below the skimmer, washes soil from behind paving, wets electrical areas or appears after a large crack opens should be checked quickly. Casey blocks can include reactive clay and fill, so uncontrolled water around the shell or paving can create movement that costs more than the original leak.
Fibreglass pools have their own pattern. Water loss around returns, skimmers or lights may be a fitting seal issue, while movement in the shell or paving can indicate poor backfill support or drainage. Do not let anyone grind, patch or foam a fibreglass shell until the leak path is proven. A neat seal repair can be $450 to $1,500. A badly guessed repair can hide the real failure and make later diagnosis harder.
Concrete pools often show staining, hollow render, cracking or rough interior patches before major water loss becomes obvious. One isolated crack does not automatically mean a full renovation. Several cracks, loose render and a tired surface across the whole pool usually point toward a larger plan. Compare the cost of repeated patching with the broader renovation service before spending thousands on short-term fixes.
Not sure if it is urgent? Mark the waterline, take photos of the equipment pad and call (03) 9003 0250. A clear pattern over 24 to 48 hours is more useful than guessing.
Send leak detailsWhat the repair bill usually looks like
Leak detection is normally a separate line from repair because no one knows the repair until the leak is found. A fair quote should tell you what the inspection includes: visual checks, bucket-test review, dye testing, pressure testing, acoustic location, equipment-pad checks and written findings. A basic visit for one obvious leak may be $350 to $750. A more involved job with multiple plumbing lines may be $800 to $1,500.
| Repair | Typical cost | When it makes sense |
|---|---|---|
| O-ring, union or valve seal | $180 to $650 | Visible leak at equipment pad, no underground work |
| Skimmer or return fitting seal | $450 to $1,800 | Water level stops near fitting and shell is sound |
| Underground pipe repair | $1,500 to $6,500 | Pressure test fails and access is manageable |
| Concrete crack injection or local patch | $900 to $4,500 | Isolated crack, no widespread finish failure |
| Interior resurfacing | $18,000 to $35,000+ | Many cracks, hollow finish, rough surface and recurring leaks |
For older pools in Narre Warren and Cranbourne, the cheapest repair is not always the smallest invoice. If the pool needs resurfacing within a year, a $2,500 leak patch can be poor value. If the pool is otherwise healthy, the same $2,500 repair can buy years of service. The right answer depends on the age of the surface, the leak path and whether the structure is moving.
Get help with a Berwick pool leak
Tell us how fast the water drops and where it stops, and we will reply within 1 business day with the most sensible next step.
Pool leak questions
How much water loss is normal for a Berwick pool?
In hot windy weather, a Berwick pool can lose 3 mm to 7 mm a day to evaporation, sometimes more with spillovers or heavy use. Losing 20 mm to 40 mm a day, or needing to top up more than twice a week, is a leak check rather than normal summer evaporation.
What does pool leak detection cost in 2026?
A standard residential leak inspection is commonly $350 to $750 in 2026, depending on access and testing required. Pressure testing several lines, dye testing fittings and locating underground pipe leaks can push the investigation to $800 to $1,500 before repair.
What is the most urgent leak symptom?
Water dropping below the skimmer, air in the pump basket and damp ground near the equipment pad should be treated as same-week work. Running a pump while it draws air can damage the pump, and a suction-side leak can turn a $450 repair into a $1,500 to $2,800 equipment problem.
Can I do a pool leak test myself?
Yes. A bucket test costs nothing and can separate evaporation from likely leakage within 24 to 48 hours. You can also check the waste line, pump lid, visible valves and water level pattern before paying for a tradesperson.
When does a leaking concrete pool need resurfacing?
If water loss is linked to widespread interior finish failure, shell cracking or many hollow drummy areas, resurfacing may be more sensible than patching. Berwick concrete pool resurfacing commonly starts around $18,000 to $35,000, while isolated crack repairs may be $900 to $4,500.