Every pool loses some water to evaporation, and Stillwater's hot, dry summer stretches make that loss more noticeable than homeowners expect. Before assuming a leak, it helps to know what normal evaporation actually looks like.
Evaporation vs. an Actual Leak
In Stillwater's summer heat, a quarter inch to half an inch of water loss per day can be entirely normal, more during especially hot or windy stretches. If your pool is dropping faster than that, or losing water at roughly the same rate whether the pump is running or off, a leak becomes more likely than evaporation.
The Bucket Test
This is the standard way to separate the two. Fill a bucket with pool water and set it on the top step, so it's exposed to the same sun and wind as the pool itself. Mark the water line on both the bucket and the pool. After 24 hours, compare how much each has dropped. If the pool has lost noticeably more than the bucket, that's a leak.
Where Pool Leaks Actually Happen
- Skimmer and return lines: A common spot for slow leaks, often showing up as wet ground near the equipment pad rather than a visible drop in the pool itself.
- Light niche fittings: Small gaps here can be masked by scale buildup from Stillwater's hard water, making them easy to miss without dye testing.
- Shell or liner cracks: More common in older gunite or vinyl pools, usually confirmed with an underwater camera.
- Equipment pad plumbing: Pumps, filters, and valves can leak independently of the pool itself.
What Happens With the Pump On vs. Off
A useful clue: if water loss only happens while the pump is running, the leak is likely in the pressurized return-side plumbing. If it continues at the same rate with the pump off, the leak is more likely in the shell, liner, or a suction-side line.
When to Call a Professional
Once the bucket test confirms a real leak, pressure testing each plumbing circuit and dye testing at suspected fittings will pin down the exact source. This usually avoids draining the pool for anything short of a significant shell repair.