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Group by The Deep End
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The Deep End
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💦 HOW MUCH WATER SHOULD MY POOL BE LOSING? 💦
One of the most common questions in the DFW Pool Owner Group is:
"My pool is losing water. Is it normal evaporation or do I have a leak?"
The answer is... it depends.
Every pool is different, and evaporation can vary dramatically from one backyard to the next.
📏 First, Let's Put Water Loss Into Perspective
Many people are surprised how much water is represented by only 1" of water loss.
💧 1 inch of water over 100 square feet equals approximately 62 gallons.
The average backyard pool is roughly 500 square feet of surface area.
That means:
💧 1 inch of water loss = approximately 312 gallons
💧 2 inches of water loss = approximately 624 gallons
💧 3 inches of water loss = approximately 936 gallons
That's why a pool can appear to be losing a lot of water even when the loss is completely normal.
🌞 Typical DFW Evaporation by Month
(Undisturbed Water Surface)
January: 1.5–2.0 inches/month
February: 2.0–2.5 inches/month
March: 3.0–4.0 inches/month
April: 4.5–5.5 inches/month
May: 5.5–6.5 inches/month
June: 6.5–7.5 inches/month
July: 7.0–8.0 inches/month
August: 7.0–8.0 inches/month
September: 5.5–6.5 inches/month
October: 4.0–5.0 inches/month
November: 2.5–3.5 inches/month
December: 1.5–2.0 inches/month
These values represent relatively calm, undisturbed water surfaces and should only be used as a starting point.
🏊 The More You Disturb The Water, The More You Evaporate
Think about a glass of water sitting on the counter versus pouring that same glass back and forth between two glasses all day. The more water exposed to air, the faster it evaporates.
Approximate Multipliers:
✅ Calm Pool Surface
x1.0
✅ Pool Returns Breaking the Surface
x1.1–1.2
✅ Raised Spa Spillway Running Daily
x1.1–1.3
✅ Bubblers / Aerators
x1.1–1.3
✅ Deck Jets
x1.2–1.5
✅ Sheer Descents
x1.2–1.6
✅ Waterfalls
x1.3–2.0+
✅ Negative Edge Pools
x1.5–3.0+
⚠️ Important Disclaimer
Not all water features are created equal.
A small waterfall running two hours per day is not the same as a large grotto waterfall running twelve hours per day.
One bubbler is not the same as six bubblers.
A small spa spillway is not the same as a large spillway moving significant water.
These multipliers are intended only as general guidelines. Actual evaporation can vary substantially.
🌳 Other Factors That Affect Evaporation
✔ Wind exposure
✔ Privacy fences and wind blocks
✔ Trees and landscaping
✔ Shade
✔ Water temperature
✔ Air temperature
✔ Humidity
✔ Pool covers
✔ Pool orientation to prevailing winds
Two pools with identical equipment can have very different evaporation rates simply because one is shaded and protected from wind while the other sits in full sun with strong wind exposure.
🌧 Rainfall Can Be Misleading
Just because DFW Airport received 1.5" of rain does NOT mean your backyard received 1.5".
North Texas storms are often highly localized.
Your pool may have received:
☔ 0.5"
☔ 1.5"
☔ 3.0"
Always consider what happened at your own home rather than relying solely on regional weather reports.
🧪 Chemistry Can Be A Clue
One of the best ways to identify a possible leak is by monitoring chemistry trends over time.
I highly recommend testing and recording at least monthly:
✔ Calcium Hardness (CH)
✔ Cyanuric Acid (CYA / Stabilizer)
These values typically move slowly on their own.
In North Texas, calcium hardness generally increases over time because our fill water contains calcium.
If your calcium hardness is dropping and you have not:
• Drained water
• Overflowed from heavy rains
• Accidentally overfilled the pool
• Lost water through a spillway
then a leak becomes a possibility.
The same concept can apply to CYA.
If you notice unexpected drops in CH or CYA, begin testing weekly and recording the results.
One test rarely tells the story.
A trend often does.
🔍 When Should You Suspect A Leak?
If your water loss appears significantly higher than expected for the season, your pool features, and your local weather conditions, you can start with a bucket test. But Bucket tests take a few days, and the water in the bucket is not necessarily being exposed to the same evaporation factors as the pool. i.e. water falls, upturned returns, etc...
If water chemistry trends, water loss measurements, and the bucket test all point toward a leak, it's time to investigate further.
📞 If you believe you definitely have a leak, Poolwerx Deep End Team performs professional swimming pool leak detection throughout the DFW area, and we'd be happy to help.
Call: 972-962-9119
📋 Bottom Line
Most DFW pools lose water every day.
Evaporation is normal.
Water features can dramatically increase water loss.
Rainfall varies by neighborhood.
Chemistry trends can help identify leaks.
And understanding how many gallons are represented by even a small drop in water level can help you determine whether what you're seeing is normal—or something worth investigating.
— Deep End Frank
