Is My Pond Leaking, or Is It Just Summer Evaporation?
It is one of the most common questions I get once the weather warms up: “Jordan, my water level keeps dropping. Do I have a leak?” Sometimes the answer is yes. But more often than not, the cause turns out to be something simple. Before you start to worry, here is how to tell the difference, where leaks usually hide, and what is actually worth calling someone about.
Is It a Leak, or Just Evaporation?
Here is the part most people do not realize: ponds lose water to evaporation every single day, and in a hot Virginia summer, that adds up fast. At a minimum, expect to lose somewhere around an inch of water per week to evaporation alone. With an active waterfall or stream running, since moving water evaporates faster than still water, that number climbs quickly, and a loss of half an inch to three-quarters of an inch per day is common.
So a dropping water level is not automatically a leak. The real question is how much you are losing, and that is exactly what the test below will help you figure out.
How to Test for a Pond Leak Yourself
Want to check before you call anyone? Here is an easy way to narrow it down:
- Top your pond off to its normal level.
- Turn off the pump and waterfall, then mark the water line with tape or a grease pencil.
- Let it sit for a day or two, then check the mark.
If the level holds steady with the pump off but drops when it is running, the issue is almost always somewhere in the waterfall, stream, or plumbing, not the pond basin itself. If it keeps dropping steadily even with everything off, the leak is more likely in the pond liner.
Either way, you have just narrowed it down enormously before anyone sets foot in your yard.
If you have fish, add a small battery-powered aerator while the pump is off so they have plenty of oxygen during the test.
Where Do Pond Leaks Usually Hide?
After years of tracking these down across the Richmond area, I can tell you most leaks are not dramatic. The usual suspects are:
Settled Liner Edges
By far the most common culprit. Over time, the ground beneath a liner edge along the waterfall or stream can shift and settle, letting water trickle over the edge where you cannot see it.
A Stream Blocked by Debris
Leaves, sticks, or overgrown plants can back water up in the stream and push it over the side of the liner.
The Skimmer or Biofalls
Loose fittings or a clogged skimmer basket are an easy source of sneaky water loss.
Plumbing Connections
A small drip at a fitting can quietly drain a surprising amount of water over time, especially when it is hidden behind rockwork.
The Good News: Most Pond Leaks Are Simple Fixes
A leak does not have to mean a big, expensive project. A large share of the water-loss calls I get are resolved right on the spot: packing soil beneath a settled liner edge, clearing leaves and debris from the stream, or emptying a clogged skimmer basket. More often than not, that is genuinely all it takes to get a pond holding water again.
When Should You Call a Pond Professional?
If you have run the test above and your pond is still losing more than it should, that is when it is worth bringing in someone who does this every day.
My one-hour leak inspection is built exactly for this. I carefully check all the usual culprits: beneath the rocks, the plumbing fittings, the low edges in the liner, and the hardware. Minor fixes like the ones above are included right in the visit. If I find something that needs more extensive work, I will walk you through exactly what I see and provide a clear, separate estimate. No surprises.
Help Your Pond Pro Find the Leak Faster
Before I come out, there is one thing that helps enormously: document what you are seeing.
- Run the simple test above and write down how much the water dropped and over how long.
- Snap a few photos of any wet or soggy spots around the pond, waterfall, or stream.
- Note the time of day the level seems to fall fastest.
Sharing that with me ahead of the visit gives me a real head start. It often means I can pinpoint the leak faster and spend our time fixing it, rather than hunting for it.
If your pond has been losing water this summer and you would like a second set of eyes on it, reach out anytime.
Frequently Asked Questions
Can I run the leak test if I have fish in the pond?
Yes, but add a small battery-powered aerator while the pump and waterfall are off. A day or two without circulation is fine for most fish as long as they have oxygen.
What if the water only drops when the waterfall is running?
That points to the waterfall, stream, or plumbing rather than the pond basin itself, which usually means a smaller, faster fix.
How much worse can a leak get if I ignore it?
Small leaks rarely stay small. A settled liner edge tends to erode further over time, and a slow drip at a fitting can turn into a steady one. Catching it early almost always means a simpler fix.
Do I need to drain my pond to find a leak?
In most cases, no. The majority of leaks are found and fixed without draining the pond, which is easier on your fish, your plants, and your schedule.
Is a sudden, large drop different from a slow one?
Yes. A sudden overnight drop usually points to something specific, like a torn liner or a major plumbing failure, while a slow, steady drop over days or weeks is more often one of the simple culprits above.
