Pool Losing Water in Texas? How to Tell If It’s Evaporation or a Leak

If your pool is losing water during a Texas summer, it’s natural to wonder whether it’s simply evaporation or a leak. In Texas, the most common causes of pool water loss are evaporation, everyday pool use, and leaks. While evaporation is expected during the summer, excessive or unexplained water loss may indicate a problem that needs attention.

This article walks you through what’s normal, what’s not, and how to figure out which situation you’re actually in. Identifying the cause early helps protect both your pool and your water bill.

Understanding Pool Water Loss

Pool water loss occurs when water leaves your pool through evaporation, normal use, or leaks. Your pool can even lose water for more than one reason, but not all of them are problems. Some are just part of owning a pool in Texas heat, while others truly need fixing.

Why Is My Pool Losing Water?

If your pool is losing water, the cause usually falls into one of two categories: normal water loss from everyday conditions or water loss caused by a leak or equipment problem.

Natural causes include:

• Evaporation — During the hottest parts of the Texas summer, especially when temperatures stay above 95°F, pools naturally lose water through evaporation. Wind, low humidity, direct sunlight, and warm water temperatures can all increase evaporation, making water loss more noticeable.
• Splash-out — Active swimming naturally sends water over the pool’s edge. Kids, dogs, and energetic pool games can all contribute to water loss.
• Backwashing — If you have a sand or DE filter, backwashing removes debris from the filter but also sends some pool water to waste. (Cartridge filters do not require backwashing.)

Abnormal causes are a different case:

• Leaks — Cracked plumbing, damaged fittings, failing equipment, or structural cracks can all cause your pool to lose water faster than normal evaporation.
• Structural issues — Soil movement, deteriorated vinyl liners, cracked skimmers, or damaged pool shells can create leaks that lead to steady, unexplained water loss.

What Pool Water Loss Means and How to Spot It

A dropping water level simply means your pool is losing water faster than it’s being replaced. The next step is determining whether that rate of water loss falls within the normal range.

To observe and track it:

• Mark the waterline on your pool tile or skimmer with a piece of tape
• Check it at the same time every day — morning works well before the sun affects the reading
• Use a ruler or tape measure to record how many inches have dropped over 24 hours

During a typical Texas summer, many pools lose about 1/8 to 1/4 inch of water per day through evaporation. During periods of extreme heat, low humidity, and windy conditions, evaporation can occasionally approach 1/2 inch per day. If your pool consistently loses more water than expected for the weather conditions, or the loss continues despite cooler or calmer weather, it’s worth investigating for a possible leak.

How Much Pool Water Loss is Normal in Texas Summers?

Most Texas pools lose about 1 to 2 inches of water per week during a typical summer, although periods of extreme heat, dry air, and persistent wind can temporarily push evaporation closer to 3 inches per week.

Evaporation Rates in July: The Texas Perspective

July in Texas brings three conditions that speed up evaporation: high heat, low humidity in many regions, and wind. Together, these conditions significantly increase evaporation rates.

• Temperatures across much of Texas regularly exceed 95°F during July.
• During drier periods, lower humidity allows moisture to evaporate from the pool surface more quickly.
• Even light winds continually move moist air away from the water’s surface, increasing evaporation.

Here’s what that actually looks like in practice:

• Daily loss from evaporation: somewhere between 1/8 and 1/4 inch, which adds up to roughly 1 to 2 inches per week.
• Under typical July conditions, this equals roughly 1 to 2 inches of water loss per week.

For a standard 16×32-foot pool, every inch of water equals approximately 320 gallons. Losing 2 inches per week means replacing roughly 640 gallons of water from evaporation alone.

When Does Water Loss Become a Concern?

Water loss becomes a concern when it exceeds what normal weather conditions and regular pool use can reasonably explain. In most cases, consistently losing more than 2 inches per week deserves further investigation.

Signs your pool that’s losing water may point to something beyond evaporation:

• The water level drops more than 1/4 inch per day consistently under typical summer conditions.
• Wet or soggy ground around the pool area that isn’t from splash-out or irrigation.
• You’re refilling the pool far more often than usual
• Persistent air bubbles are coming from the return jets, especially alongside noticeable water loss.
• The pump loses prime or begins drawing air because the water level has dropped below the skimmer.

If any of these warning signs show up, don’t wait, since leaks often become more expensive to repair over time.

Is It Evaporation or a Leak? How to Tell the Difference

One of the more practical ways to check whether your pool water loss is due to evaporation or a leak is the bucket test. No special equipment is required, and you’ll usually have an answer within 24 hours.

The Bucket Test Explained

The bucket test compares how much water evaporates from your pool with how much evaporates from a bucket sitting under the same conditions.

Here’s how to run it:

• Fill a straight-sided bucket about three-quarters full with pool water.
• Place the bucket on a pool step so it’s partially submerged and stable, with the water inside at roughly the same level as the pool water outside.
• Mark the water level inside the bucket with tape or a marker. Then mark the pool’s water level on the outside of the bucket.
• Turn off any automatic water-fill system so it doesn’t replace lost water during the test.
• Leave the pool operating under its normal conditions for 24 hours. Avoid swimming or adding water during the test.
• Compare the two water levels after 24 hours.

Avoid performing the test during rain or unusually windy conditions, as both can affect the results.

Reading the results:

• If the pool water drops noticeably more than the bucket water, the pool is likely losing water from something other than normal evaporation.
• If both water levels drop by about the same amount, evaporation is the most likely explanation.

The bucket test won’t pinpoint the exact location of a leak, but it can tell you whether further investigation is needed.

Other DIY Leak Detection Methods

If the bucket test result suggests that there’s a leak, a few more checks can help you get closer to the source before calling anyone.

Visual inspection:

• Look for cracks around the pool shell, tile line, skimmer, returns, or light fixtures.
• Check expansion joints and caulking for separation or deterioration.
• Inspect the equipment pad for wet spots, dripping equipment, or plumbing leaks.
• Watch for unusually soggy ground around the pool or equipment.

Pool dye test:

• Turn off the pump and allow the water to become completely still.
• Using leak detection dye or a few drops of dark food coloring, slowly release the dye directly next to a suspected crack, fitting, skimmer, or light niche.
• If the dye is drawn into one specific spot, it may indicate a leak.

What to Do If You Suspect a Leak

If your tests point to a leak and you can’t locate the source on your own, the next step is professional pool leak detection. Leaks rarely resolve on their own, and waiting usually allows water loss and potential damage to worsen.

When to Call a Pool Leak Repair Company

Reach out to a pool leak repair company when:

• Your pool consistently loses more water than expected for the current weather, especially more than about 2 inches per week during typical summer conditions.
• Wet ground, unusually soft soil, or areas of deck settling around the pool or equipment.
• There are visible cracks or shifts in the pool structure, deck, or tile line
• DIY tests confirm a leak, but you can’t find where it’s coming from
• Your pump frequently loses prime or shows signs of drawing in air

What a professional pool leak detection service typically involves:

• Pressure testing of the pool’s plumbing lines to determine whether the leak is in the plumbing system.
• Electronic listening devices and underwater microphones to locate leaks without excavation
• A clear diagnosis with repair options before any work begins
• Many companies provide written findings and repair recommendations.

Professional pool leak detection companies often use a combination of these methods to accurately locate leaks before recommending repairs.

Choosing the Right Pool Leak Detection Service

Pool leak detection services aren’t all the same. Some companies specialize in pool leak detection, while others are general plumbers who also offer the service. That difference matters when the problem is underground or inside your pool shell.

What to look for in a provider:

• Licensed and insured: If something goes wrong on your property, you want that covered
• Experience specifically with swimming pool leak detection and repair, not just general plumbing.
• Pricing that’s clear before anything starts
• Reviews from actual pool owners in your area, not just general contractor ratings

Before you hire, ask:

• What tools and methods do you use for pool leak detection?
• Do I get a written report after the inspection?
• If repairs are needed, does your team handle them, or will I need to hire another contractor?
• What does your guarantee cover, and for how long?

Preventing Excessive Water Loss: Best Practices for Pool Care

Reducing evaporation, spotting leaks early, and regular maintenance are the best ways to prevent excessive water loss.

Tips for Minimizing Evaporation

• A pool cover does more than keep debris out. It’s the most effective way to hold water in when the pool isn’t being used
• Providing shade with structures like shade sails, pergolas, or strategically placed landscaping can reduce direct sunlight on the water, which helps slow evaporation. Windbreaks such as fencing or hedges can also help reduce evaporation caused by wind.
• Refill in the early morning or after sundown. If you need to add water, early morning or evening is ideal because evaporation rates are typically lower than during the hottest part of the day.
• Keep the water level around the middle of the skimmer opening. If it’s too high, splash-out becomes a bigger factor

Regular Maintenance to Prevent Leaks

• Inspect the pool perimeter once a week for wet spots, new cracks, or anything that looks off
• Poor water chemistry—especially persistently low pH or low alkalinity—can accelerate corrosion of metal components and deterioration of seals, fittings, and some pool surfaces over time.
• Keep a simple log of your water levels to help spot unusual changes over time
• An occasional professional inspection can help identify small issues before they become costly repairs, especially on older pools.

Frequently Asked Questions (FAQs)

1) How can I tell if my pool is leaking or just evaporating?

Run the bucket test — it’s the most straightforward way to know. If the pool’s water level drops more than the water level inside the bucket, the pool is likely losing water from something other than normal evaporation, making a leak the most likely explanation.

2) What is the average amount of pool water loss per week in Texas?

During a typical Texas summer, most pools lose about 1 to 2 inches of water per week through evaporation. During periods of extreme heat, low humidity, or persistent wind, evaporation can occasionally be higher.

3) Are there simple tests I can do before calling a pro?

Yes. The bucket test is the most reliable DIY method. A visual check around the tile line, equipment pad, and exposed plumbing is also helpful. Pool dye placed directly next to a crack or fitting will drift toward the opening if water is escaping through it.

4) How quickly should I act if I suspect a leak?

If you suspect a leak, it’s best to investigate it as soon as practical. Even  a slow leak that goes ignored for weeks can waste a serious amount of water and may eventually contribute to soil erosion or structural damage around the pool.

5) Can normal pool maintenance reduce the risk of leaks?

Yes. Regular maintenance can help prevent leaks by catching worn fittings, small cracks, and equipment issues before they become larger problems. Keeping your water chemistry balanced also protects pool surfaces and plumbing components over time.

Take Control of Your Pool’s Water Loss

A pool losing water during a Texas summer isn’t unusual. In most cases, evaporation accounts for about 1 to 2 inches of water loss per week, especially during periods of intense heat. However, if your pool is losing water faster than expected, it’s time to investigate further. This is especially true if the loss is accompanied by wet ground, air bubbles, or equipment issues.

The bucket test is a reasonable first step, and regular tracking helps you notice changes early. If something doesn’t add up, calling a pool leak repair company before the problem gets worse is often the smarter financial decision.

If your pool continues losing water after you’ve ruled out normal evaporation, or your DIY tests suggest a leak, professional leak detection can identify the source before the problem becomes more expensive to repair. Poolie’s experienced technicians use specialized equipment to locate leaks accurately, so you can make informed decisions about the next steps. Schedule an inspection using the form below to get started.