Pool Skimmer Leaking Water? Check This First
Suspected skimmer leaks can be confusing because water often shows up near the skimmer even when the source is the coping joint, mastic, or nearby deck area. Here’s what to check before replacing parts.
Some suspected skimmer problems are actually joint or coping leaks. A quick inspection can help you avoid replacing the wrong part.
4 Quick Tests: Skimmer Problem vs. Expansion Joint Failure
Do these simple tests before calling anyone. Results will tell you exactly what type of repair you need.
Water Level Test
Fill pool to normal level, mark water line, wait 24 hours
Water drops significantly (2+ inches)
Water drops slightly (½-1 inch), stops at skimmer bottom
Visual Inspection
Look around skimmer opening while pool is full
Cracks in skimmer body, loose fittings visible
Water seeping from deck/skimmer junction, mastic gaps visible
Dye Test
Squeeze food coloring near suspected leak areas
Dye gets sucked into skimmer cracks or fittings
Dye flows toward deck/skimmer gap, follows expansion joint
Deck Inspection
Check soil around pool for wet spots or settling
Minimal soil impact directly under skimmer
Soggy soil along deck perimeter, possible deck settling
Signs the Expansion Joint Should Be Checked
Water level stops dropping near the skimmer bottom
If the loss slows after the water drops below a certain height, the leak may be near that elevation rather than deep underground.
Mastic or caulk around the skimmer is cracked or missing
Open joints can let pool water move into the deck/coping area and show up near the skimmer.
Water stains on the deck near the skimmer
Mineral stains can be a clue that water has been traveling through the joint or deck edge.
Deck settling or cracks near the skimmer area
Ongoing moisture can contribute to soil movement around the pool deck in DFW clay conditions.
When It May Actually Be Your Skimmer
Visible cracks in skimmer body
Physical damage to skimmer housing allows direct water escape
Loose plumbing connections inside skimmer
Pipe fittings have worked loose, allowing water to bypass system
Water continues dropping below skimmer level
Leak source is lower in system - main drain, returns, or underground plumbing
Why Accurate Diagnosis Matters
📋 What You See
Pool loses water when filled to normal level
❌ Wrong Assumption
Skimmer body must be cracked
Replacing the wrong part can cost more than a surface joint repair
✅ Likely Reality
The skimmer, coping joint, tile line, and mastic should all be checked at the same water level
📋 What You See
Water loss slows near skimmer height
❌ Wrong Assumption
The leak must be inside the skimmer
A focused inspection helps narrow the source before repair work starts
✅ Likely Reality
Any opening near that elevation can create the same pattern, including failed mastic nearby
📋 What You See
Wet soil appears near the skimmer
❌ Wrong Assumption
Underground skimmer plumbing is leaking
Confirm the source before excavation or major plumbing work
✅ Likely Reality
Water can travel from the pool edge and collect at low spots around the skimmer area
💡 Average Savings: $1,300-3,800 by Identifying the Real Problem
Pool leaks can look similar from the surface. Confirming the source first helps avoid unnecessary skimmer replacement, excavation, or repeat repair work.
What to Do Next If Water Loss Is Active
Reduce ongoing water loss if needed
Do promptlyIf the pool is losing water quickly, lower the water below the suspected leak level when it is safe for your equipment.
Document the pattern
Same dayTake photos of the water line, skimmer face, cracked mastic, stains, and any damp deck areas.
Check nearby joints and deck movement
Before authorizing repairsLook for gaps, brittle sealant, settling, or cracks around the skimmer and coping area.
Get a source-focused assessment
Within 24-48 hours for active water lossAsk for diagnosis of the skimmer, fittings, coping joint, and pool mastic before replacing equipment.
Need Professional Assessment?
Our Leak Assessment Can Include:
If the leak is severe or the pool is losing water quickly, get expert diagnosis.
Related Pool Leak & Joint Solutions
Pool Mastic Replacement
Professional expansion joint repair when a suspected skimmer leak traces back to failed pool mastic.
Get Professional Repair →Water Behind Pool Tiles?
Another possible sign of water getting behind the tile line or coping area.
Learn What to Check →Emergency Pool Repair
Priority response for fast water loss, active leaks, and visible pool-deck movement.
Get Priority Service →