Pool Leak Detection in Portland, OR
Find the exact source of your pool leak before you replaster, drain, or dig. Pressure testing and dye testing for inground pools throughout the Portland metro — gunite, fiberglass, and vinyl liner.
Pressure testing on all plumbing lines
Written report before any repair
Gunite, fiberglass & vinyl liner pools
Detection only — no repair conflict
Is Your Portland Pool Actually Leaking — or Just Evaporating?
Portland’s mild summers create a diagnostic problem that pool owners in hotter climates do not have. Evaporation here is low — typically a quarter inch per day or less even in the hottest July weather. If your pool is dropping more than that in summer, with the cover off, it is almost certainly leaking rather than evaporating.
The Bucket Test — Do This First
Fill a bucket, set it on the pool step, and mark both the pool water level and the bucket water level. Wait 24 hours. If the pool dropped more than the bucket, you have a leak. The bucket accounts for evaporation, so any additional pool loss is from a leak in the shell or plumbing. If both drop the same amount, the pool is not leaking — you are just evaporating normally.
Do you need to drain the pool to find the leak? For plumbing line leaks, no. We pressure test the return lines, skimmer, main drain, and light niche with the pool full. A pressure drop in any circuit confirms a failure in that line. If the plumbing holds pressure, the shell itself is suspect — dye testing locates cracks, skimmer throat gaps, and fitting separations without draining the pool.
Portland area pools are mostly gunite and concrete, particularly in older established neighborhoods — the West Hills, Westmoreland, Lake Oswego, Lake Grove, and West Linn homes built between the 1960s and 1990s. Fiberglass pools are more common in newer construction. Vinyl liner pools are less common here than in other parts of the country but we service them too.
What is the most common pool leak we find in Portland? Skimmer throat separation, by a significant margin. As gunite pools age, the plastic skimmer throat can separate from the concrete shell — water drains straight down the gap rather than recirculating. It is often invisible from the surface. Dye injection at the skimmer throat shows the separation immediately.
Schedule Pool Leak Detection
Call or text with your pool type, approximate age, and what you are seeing — how much water it is losing per day, whether the auto-fill is running constantly, or whether the loss changes when the equipment is on or off. That last detail is important: loss only when the pump runs usually means a pressure-side plumbing leak; loss only when the pump is off usually means a suction-side or shell issue.
Mon–Fri 8AM–6PM · Sat 9AM–4PM · Sun by appt
2455 NW Nicolai St, Unit 200, Portland, OR 97210
Pool Leak Detection Services We Provide
Every component that can leak in an inground pool — plumbing lines, shell, skimmer, fittings, and equipment pad.
Return Line Pressure Testing
Return lines carry water from the pump back to the pool. We pressure test each return circuit with the lines isolated to confirm whether any line is losing pressure. A failing return line joint or crack in the line shows up immediately as a pressure drop in that circuit. Common in older gunite pools where the original plumbing was galvanized or ligid copper.
Skimmer & Main Drain Testing
The skimmer box, skimmer throat, and main drain are the most common failure points in Portland inground pools. We pressure test the skimmer circuit and use dye testing to confirm whether the skimmer throat has separated from the shell — the most common single cause of pool water loss we encounter in this area.
Light Niche & Fitting Pressure Testing
Pool light niches have a conduit that exits through the pool shell. When the gasket or niche fitting fails, water follows the conduit into the ground rather than recirculating. We pressure test the light niche circuit and use dye at the fitting when pressure testing indicates a loss in that area.
Shell & Fitting Dye Testing
When plumbing pressure tests hold but the pool is still losing water, the shell itself is the source. We introduce dye at suspected crack locations, fittings, and transitions — any failure point pulls the dye toward it visibly. This works on gunite, fiberglass, and vinyl liner pools without draining the pool.
Equipment Pad Plumbing
The plumbing between your pump, filter, heater, and pool shell runs above grade at the equipment pad and underground on both sides. Equipment pad fittings, unions, and valves fail from UV exposure, thermal cycling, and age. We pressure test and visually inspect the pad plumbing as part of every pool leak detection visit.
Vinyl Liner Inspection
Vinyl liner leaks are typically found at the fittings — where the return jets, skimmer, and light niche penetrate the liner — rather than in the liner body itself. We use dye testing at all fittings and inspect the liner perimeter at the bead track. If the liner body has a tear, it is usually visible during inspection with the pool at operating level.
How Pool Leak Detection Works — Step by Step
From your call to a confirmed leak location in one visit.
Water Loss Confirmation
We start by confirming the rate of loss and whether it changes when the pump is on versus off. Loss only when the pump runs points to pressure-side plumbing. Loss when the pump is off points to suction-side or shell. This directs the sequence of testing.
Plumbing Pressure Testing
We cap and pressurize each plumbing circuit in isolation — returns, skimmer, main drain, light niche. A circuit that cannot hold pressure has a failure somewhere along its run. This confirms which line is leaking before any dye or digging begins.
Dye Testing
At the skimmer throat, fittings, shell cracks, and any point where pressure testing flagged a possible failure, we introduce dye into the water near the surface. Any leak point pulls the dye visibly toward it — the direction and speed of dye movement confirms the leak location.
Equipment Pad Inspection
We inspect and pressure test the above-grade plumbing at the equipment pad, including pump unions, filter fittings, heater connections, and any valves. Equipment pad leaks are common and often overlooked when owners focus on the pool shell itself.
Leak Location Mark
We mark the confirmed leak location clearly — on the pool deck, shell surface, or equipment pad — so your pool contractor or plumber can make a targeted repair without exploring. One mark, one repair, no guessing.
Written Report
Before we leave: water loss observations, pressure test results by circuit, dye test findings, and the marked location. If your contractor or insurance adjuster needs documentation before authorizing a repair, this report covers it.
Pool Types in Portland — What We See and How We Detect
The construction type affects where leaks happen and how we find them.
Gunite & Concrete Pools
The most common pool type in Portland’s established neighborhoods. Gunite pools from the 1960s through 1990s in the West Hills, Westmoreland, and Lake Oswego areas most commonly fail at the skimmer throat, return line joints, and light niche. Shell cracks from settling or freeze-thaw cycles also occur, particularly near the skimmer and steps.
Fiberglass Pools
More common in newer Portland metro construction from the 1990s forward. Fiberglass shells do not crack the way gunite does, but fittings — the return jets, skimmer, and main drain penetrations through the shell — are the primary failure points. Pressure testing and dye testing at fittings is the standard approach.
Vinyl Liner Pools
Less common in the Portland metro than in other regions, but present. Liner failure is usually at fitting penetrations rather than in the liner body. Liner tears at the waterline or near steps are inspected visually. Dye testing confirms fitting leaks at returns, skimmer, and light niche.
Older Galvanized Plumbing
Pools built before the 1980s in Portland sometimes have galvanized steel plumbing lines underground. These corrode from outside in and fail at fittings and joints. Pressure testing isolates which circuit is failing; tracer gas or acoustic equipment locates the specific point underground without digging first.
Signs Your Portland Pool Has a Leak
At the Pool
- Water level dropping more than the bucket test shows for evaporation
- Auto-fill valve running constantly or cycling on frequently
- Loss rate changes depending on whether the pump is on or off
- Visible cracks in the shell near the skimmer, steps, or waterline
- Algae growing in one consistent spot on the shell wall
- Pool chemicals requiring more frequent adjustment than normal
- Skimmer box visibly separated or cracked at the throat
Around the Property
- Wet ground or soft spot near the equipment pad when no rain has fallen
- Unusually green or lush grass in one area of the pool deck perimeter
- Water bill higher than prior summers with no change in household use
- Settling or lifting of pool decking near the skimmer or return jets
- Heaving near the pool perimeter or uneven settling of the deck surface
- Soggy ground near the filter, pump, or heater equipment
Pool Leak Detection — Portland Metro Service Area
We serve inground pool owners throughout Portland and the surrounding communities. Can you find a leak in a fiberglass pool? Yes — same pressure testing and dye approach, focused on fitting penetrations where fiberglass shells most commonly fail. We cover the full Portland metro within approximately 20 miles.
Pool Leak Detection — Common Questions
The bucket test is the most reliable starting point. Fill a bucket, place it on the pool step, and mark both the pool water level and the bucket water level with tape. Leave the pump running normally. After 24 hours, if the pool dropped more than the bucket, you have a leak. Portland’s summer evaporation rate is low — typically a quarter inch per day or less. If you are losing half an inch or more per day, it is almost certainly a leak rather than evaporation. A leak that changes rate depending on whether the pump is on or off gives you a further clue: pressure-side (pump running) versus suction-side or shell (pump off).
No. Pressure testing is done with the pool at operating level — we cap off each circuit and pressurize it independently with the pool full. Dye testing is also performed with the pool full; the dye is introduced near the suspected location and any leak point pulls it visibly. Draining a pool to find a leak is rarely necessary and can actually make some leaks harder to locate because changes in shell pressure can affect crack behavior. We locate the vast majority of Portland pool leaks with the pool at normal operating level.
In Portland’s older gunite pool stock, skimmer throat separation is the most common single cause. The plastic skimmer throat separates from the concrete shell over time — it is almost invisible from the surface but creates a direct path for water to drain into the ground rather than recirculate. Return line joint failures are the second most common in older pools with original plumbing. In newer fiberglass installations, fitting penetrations — where returns, skimmer, and light niche pass through the shell — are the primary failure points.
Yes, and that symptom is actually helpful. Loss only when the pump runs almost always means a pressure-side plumbing leak — a crack or failed joint in the return lines or fittings that only opens under pump pressure. We pressure test the return circuits with the lines isolated and pressurized to confirm which line is losing pressure. Acoustic equipment can then locate the specific failure point underground without digging. Conversely, loss only when the pump is off points to the suction side or the shell itself.
No. Replastering a leaking pool does not fix a plumbing line leak, a skimmer throat separation, or a fitting failure — those are structural or plumbing issues that new plaster does not address. If the leak is in the shell surface itself, replastering might address it, but that is worth confirming first. We locate the source before any repair decision is made. Knowing whether you have a $300 skimmer throat repair or a $3,000 plumbing reroute is information you want before committing to either replastering or excavation.
Find Your Pool Leak in Portland — Before You Replaster or Dig
Call or text with your pool type, age, and what you are seeing. Same-day service available across the Portland metro. No draining. No destruction. Just the location.
(503) 914-2356 — Call or Text Now
No opening. No destruction. Just the location and a plan to fix it.