--- title: "Pool Water Level and Evaporation in a Texas Summer" description: "A pool can lose about a quarter inch a day to evaporation. See what drives water loss, how to tell it from a leak with a bucket test, and what city rules say." url: https://marinapool.multisites.ai/post/pool-evaporation-texas-summer publisher: Marina Pool Services phone: +1-817-896-1120 quote: https://marinapool.multisites.ai/contact --- # Pool Water Level and Evaporation in a Texas Summer PoolResearch.com puts average pool evaporation near one quarter inch per day, or about two inches a week. Sun, wind and heat raise it. If the pool drops more than a bucket of water set beside it, suspect a leak. City drought rules may limit how you top off, so check yours. Water carePublished October 21, 20264 min read ## How much water does a pool lose in a Texas summer? About a quarter inch a day is the common figure. PoolResearch.com says average evaporation is “around 1/4 inch of water per day,” or roughly 2 inches a week. It gives a range of two millimeters to two inches a week. PoolResearch’s article is not specific to Texas. Its sample chart is for a 400-square-foot pool with minimal use, no rain and a dry climate. It shows 10 inches (2,469 gallons) lost in summer, 7.8 inches in spring, 5.7 in fall and 2.8 in winter. Use it as a model, not a promise. DFW summers are hot. The National Weather Service counted 52 days at or above 100 F so far in 2026 as of September 22. Hot days speed evaporation. ## What makes the water level drop faster? PoolResearch says climate is the biggest factor. It names: - Sun and solar radiation - Wind - Temperature - Rainfall - The gap in vapor pressure between water and air It also lists human factors: whether the pool sits in sun or shade, swimmer traffic, splashing, and fountains or other water features. Splash-out and backwashing also lower the level, but those are not evaporation. Factor Effect on water loss Hot, dry, windy day More evaporation Full sun More evaporation Water features and fountains More evaporation Pool cover when not in use Less evaporation Shade Less evaporation ## Is it evaporation or a leak? Do a bucket test. PoolResearch describes it this way: 1. Fill a bucket with pool water and mark the level. 2. Set it on a pool step with the rim slightly above the water line. 3. After 24 hours, mark the new level. 4. Compare the loss in the bucket to the loss in the pool. PoolResearch says, “if the bucket loses less water than your pool, a leak is likely the culprit.” Run the test when no rain is forecast. Our [bucket test guide](https://marinapool.multisites.ai/guides/pool-leak-bucket-test) has the full steps. PoolResearch adds a second test with the pump off. Comparing the two results can point to the return lines, the skimmer or drain, or a structural problem in the shell, liner or fittings. Finding and fixing leaks is a separate trade. Marina Pool Services does not list leak detection, so ask a leak specialist for that work. ## What does a low water level do to the equipment? A low level can pull air into the system. That can make the pump lose prime and run dry. See our post on [why a pump loses prime](https://marinapool.multisites.ai/post/pool-pump-loses-prime-air-leak). A dry-running pump can fail. Keep water high enough that the skimmer draws water. Your pump and filter manuals describe the right level for your setup. An [automatic water leveler](https://marinapool.multisites.ai/glossary/automatic-water-leveler) tops off for you. That is handy, but it can hide a leak. If your bill jumps or the leveler runs a lot, run the bucket test. ## Can I top off my pool during a drought? Often yes, with limits. Rules vary by city and stage, and they change. As of October 2026, Keller’s page says: - Stage 1 restricts draining and refilling swimming pools. - Stage 2 prohibits filling pools with automatic fill valves. - Stage 3 prohibits draining, filling or refilling pools, but allows filling existing pools to maintain levels. Pools may not be refilled with automatic fill valves. Euless’s page shows no restrictions while its reservoir system is above 75 percent. It listed 81 percent on October 21, 2026. Check your own city before you fill. See [water restrictions](https://marinapool.multisites.ai/glossary/water-restrictions) in our glossary, and our post on [high CYA and drought rules](https://marinapool.multisites.ai/post/high-cya-drought-options). ## How do I cut water loss? 1. **Use a cover.** PoolResearch says covering the pool when not in use “significantly” reduces evaporation. Solid covers cut the exposed surface. Solar covers warm the water closer to air temperature, which reduces evaporation too. 2. **Turn off water features** when you are not using them. 3. **Check your [evaporation loss](https://marinapool.multisites.ai/glossary/evaporation-loss) weekly.** Mark the level with tape at the tile line. 4. **Fix leaks early.** Water loss over two inches a week deserves a bucket test. 5. **Keep up weekly service.** A tech who sees the level every week spots a change. ## Does evaporation change my chemistry? Yes. When water evaporates, the minerals stay behind. The leftover water gets more concentrated. That is plain physics, not a measured figure. High calcium leads to [scale](https://marinapool.multisites.ai/glossary/scale). Our post on calcium scale on pool tile covers it. If you top off with hard tap water, hardness rises over time. Marina Pool Services’ weekly service covers water balance, including calcium hardness, plus emptying baskets, backwashing filters as needed, and vacuuming and brushing as needed. See the [pool maintenance services page](https://marinapool.multisites.ai/our-services/pool-maintenance-services) and the weekly service page. The North Texas pool care guide covers summer in more detail. ## How do I track my water level? A simple log makes small changes visible. 1. Mark the water level against the tile or skimmer opening with painter’s tape. 2. Check it on the same day each week, at the same time. 3. Note the weather. Hot, windy days will show larger drops. 4. Note any rain, big parties or backwashing. 5. If the loss runs well above two inches a week, run the bucket test. A log also helps your service tech. It shows whether the level is following the weather or following something else. ## Next step If your water level keeps dropping, see the [pool maintenance services page](https://marinapool.multisites.ai/our-services/pool-maintenance-services), then call Marina Pool Services at (817) 896-1120 or use the quote form at [/contact](https://marinapool.multisites.ai/contact). ## Frequently asked questions ### How much water does a pool lose to evaporation in summer? PoolResearch.com says average evaporation is around one quarter inch per day, or roughly two inches a week, with a range of two millimeters to two inches a week. Its model for a 400-square-foot pool in a dry climate shows about 10 inches in summer. ### How can I tell evaporation from a leak? Run a bucket test. Fill a bucket with pool water, mark the level, set it on a pool step, and compare the loss to the pool's after 24 hours. PoolResearch says a pool that loses more than the bucket likely has a leak. ### Can I top off my pool during a drought? It depends on your city. As of October 2026, Keller's page says Stage 2 bans filling pools with automatic fill valves, and Stage 3 allows filling existing pools to maintain levels but not with automatic fill valves. Check your own city. ### Does a pool cover stop evaporation? It reduces it a lot. PoolResearch says covering the pool when not in use will significantly reduce the evaporation rate, and solid covers cut the exposed surface. The page gives no percentage. ## Pool terms on this page - [Automatic water leveler](https://marinapool.multisites.ai/glossary/automatic-water-leveler) - [Water restrictions](https://marinapool.multisites.ai/glossary/water-restrictions) - [Calcium hardness](https://marinapool.multisites.ai/glossary/calcium-hardness) - [Evaporation loss](https://marinapool.multisites.ai/glossary/evaporation-loss) - [Leak detection](https://marinapool.multisites.ai/glossary/leak-detection) - [Water balance](https://marinapool.multisites.ai/glossary/water-balance) - [Bucket test](https://marinapool.multisites.ai/glossary/bucket-test) - [Drought](https://marinapool.multisites.ai/glossary/drought) - [Skimmer](https://marinapool.multisites.ai/glossary/skimmer) - [Scale](https://marinapool.multisites.ai/glossary/scale) ## Sources 1. [PoolResearch.com: How Much Water Do You Actually Lose in Your Pool From Evaporation? (June 25, 2024)](https://poolresearch.com/water-evaporation/) 2. [City of Keller: Water Restrictions](https://www.cityofkeller.com/services/utility-billing/water-wastewater-drainage-billing/water-restrictions) 3. [National Weather Service Fort Worth: DFW Annual Days at or Above 100 F](https://www.weather.gov/fwd/danncon10) Written by Marina Pool Services and checked against the sources above on October 21, 2026. City rules and product guidance change, so check the linked page before you act. Follow product labels for any pool chemical. ## Keep reading - [Is My Pool Leaking? The Bucket Test and Next StepsA pool can lose about a quarter inch of water a day to evaporation. To tell evaporation from a leak, run the bucket test: compare the water drop inside a bucket on a pool step with the drop in the pool over 24 hours. If the pool drops more, you likely have a leak. Call a leak specialist.](https://marinapool.multisites.ai/guides/pool-leak-bucket-test) - [High CYA and Drought Rules: Your Options for Pool WaterThe reliable fix for high cyanuric acid (CYA) is diluting with fresh water, but drought rules may limit draining and refilling. As of October 2026, Keller restricts draining and refilling pools at Stage 1. Euless has no restrictions above 75 percent lake capacity. Stop stabilized chlorine, switch to liquid chlorine, and check your city.](https://marinapool.multisites.ai/post/high-cya-drought-options) - [North Texas Pool Care: Heat, Storms, Pollen, and Hard WaterNorth Texas pools face triple-digit heat, spring pollen, sudden storms, and mineral-rich water. Heat and sunlight use up chlorine, storms add debris and nutrients, and evaporation leaves minerals behind. Weekly testing, a clean filter, and steady pump run time keep most pools clear. Marina Pool Services offers weekly service in Grapevine.](https://marinapool.multisites.ai/guides/north-texas-pool-care) - [Keller Water Restrictions and Pool Top-Offs: Stage RulesKeller keeps a twice-weekly watering schedule all year. Under its drought stages, Stage 1 restricts draining and refilling pools, Stage 2 bans automatic fill valves, and Stage 3 bans draining, filling and refilling, though existing pools may be topped up by hand. Rules are as of October 2026.](https://marinapool.multisites.ai/post/keller-water-restrictions-pool-top-off) - [Why Your Pool Pump Loses Prime: An Air Leak ChecklistA pool pump loses prime when air gets into the suction side. Check the water level, empty the baskets, then inspect the pump lid and O-ring. If those are fine, look at suction fittings and valves. A hidden leak in buried pipe needs a pro.](https://marinapool.multisites.ai/post/pool-pump-loses-prime-air-leak) - [Pool Service and Repair Costs in DFW: What to Expect and What to AskPool service cost in DFW depends on pool size, tree cover, equipment, and what each visit includes. Published figures vary widely: Angi's Dallas page reports a $229 average with a $120 to $339 range. Marina Pool Services does not publish prices. It gives free estimates for qualifying services.](https://marinapool.multisites.ai/guides/pool-service-cost-dfw) ## Need a hand with your pool? Call or text and tell us what your pool needs. Estimates are free for qualifying services, and same-day estimates are possible when the schedule allows. [Call (817) 896-1120](tel:+1-817-896-1120)[Get a quote](https://marinapool.multisites.ai/contact) ![A pool technician working on an equipment pad](https://marinapool.multisites.ai/_astro/technician-equipment-pad.BW5xZMNY_Zum1K5.webp)