Knowing when and how to drain pool water is one of the most important skills a Gilbert homeowner can have. Done correctly, draining protects your pool shell, equipment, and water chemistry. Done wrong, it can cause thousands of dollars in damage.
Many pool owners in Gilbert, Chandler, Mesa, and Queen Creek make avoidable mistakes when draining their pools. Some act too quickly. Others wait too long. Either way, the results can be costly and frustrating.
In this guide, the Valley Pool Service team walks you through the most common draining mistakes and how to avoid every one of them. Whether you are managing a full drain or a partial drain, these tips will help you protect your investment and keep your pool in great shape.
Why Pool Draining Is Risky in Arizona
Arizona’s desert climate creates unique challenges for pool owners. The intense heat, high mineral content in local water, and hard ground conditions all affect how and when you should drain pool water safely.
Gilbert and the surrounding East Valley sit in a region with some of the hardest water in the country. As a result, calcium and other minerals build up in your pool over time. Additionally, the scorching summer sun can damage an empty pool shell faster than most homeowners expect.
Therefore, draining a pool here is never as simple as just pulling the plug. You need a clear plan before you start.
The Risk of Hydrostatic Pressure
Hydrostatic pressure is the force that groundwater pushes up against the bottom of your pool shell. When your pool is full, the water weight keeps it balanced. However, when you drain pool water completely, that pressure can actually pop the shell out of the ground.
This is especially relevant after periods of rain or irrigation in neighborhoods across Gilbert and San Tan Valley. Even small amounts of groundwater can build dangerous pressure quickly. For this reason, a full drain always requires careful timing and professional guidance.
UV Damage to an Empty Pool Shell
Arizona’s sun is extremely intense. An empty pool shell, whether plaster, pebble, or fiberglass, can crack, blister, or warp when left exposed to direct sunlight. Furthermore, pool plaster can dry out within hours during peak summer temperatures.
Because of this, you should never leave a drained pool sitting empty for longer than necessary. Plan all repairs or resurfacing work in advance so the pool can be refilled as quickly as possible.
Common Mistakes Homeowners Make When They Drain Pool Water
Now that you understand the risks, let’s look at the specific mistakes that get Gilbert pool owners into trouble. Many of these are easy to avoid once you know what to watch for.
Mistake 1: Draining at the Wrong Time of Year
Timing matters enormously when you drain pool water in Arizona. Draining during the hottest months of summer is a recipe for shell damage. The heat is simply too intense for an empty pool to handle.
On the other hand, draining during a period of heavy rain increases the risk of hydrostatic pressure issues. Therefore, most pool professionals recommend draining in the spring or fall when temperatures are moderate and rain is minimal.
If you are unsure about the right window, talk with a pool care expert before you begin. A short conversation can save you a very expensive mistake.
Mistake 2: Not Checking Local Discharge Rules
Many Gilbert homeowners do not realize that draining pool water into the street or storm drains may violate local ordinances. Pool water contains chlorine, algaecides, and other chemicals that can harm the environment.
The Town of Gilbert and surrounding municipalities have guidelines on how and where pool water can be discharged. Additionally, heavily chlorinated water can damage landscaping and harm local wildlife. Always check with your local authority or consult a professional before you begin draining.
Mistake 3: Draining Too Quickly Without Monitoring
Draining too fast without monitoring the process is another common error. Submersible pumps can move water rapidly, but that speed creates risks if you walk away and stop paying attention.
For example, a drain hose can shift and flood a neighbor’s yard. Meanwhile, water may back up near your foundation if drainage is poor. Moreover, the pump itself can run dry and burn out if you let it run unattended after the water level drops. Always stay nearby and check progress regularly throughout the process.
Mistake 4: Skipping the Main Drain Plug
Many pools have a main drain at the bottom of the deep end. Homeowners sometimes forget to manage this drain properly before and during the draining process. As a result, they can trap water in the plumbing lines or allow debris to enter the system.
First, make sure you understand your pool’s plumbing layout. Then, consult your equipment manual or a pool technician before you drain pool water if you are unsure. Proper plumbing management protects your filtration system and avoids costly repairs later.
Mistake 5: Ignoring Equipment Before Draining
Your pump, filter, and heater all need to be properly shut down before you drain pool water. Failing to do this can cause air locks, motor burnout, or cracked equipment housing. Furthermore, automated pool systems need to be switched to manual or off mode before draining begins.
In addition, make sure all valves are positioned correctly so you do not accidentally drain water through equipment that needs to remain dry. If you are not confident in your equipment knowledge, request a free quote from a professional service team before starting the project.
Partial Drain vs. Full Drain: Which Do You Need?
Not every situation calls for a complete drain. In fact, most Gilbert pool owners only need a partial drain in many cases. Understanding the difference helps you avoid unnecessary risk.
When a Partial Drain Makes Sense
A partial drain is often the right choice when your total dissolved solids, or TDS, are too high to balance with chemicals alone. It is also useful when your cyanuric acid level has become too elevated after months of stabilized chlorine use. Additionally, a partial drain can dilute high calcium hardness levels that are common in East Valley tap water.
Because you are not emptying the pool completely, the risks of hydrostatic pressure and UV damage are significantly reduced. Moreover, refilling takes much less time and water. For most maintenance situations in Gilbert and Tempe, a partial drain is the safer and smarter option.
When a Full Drain Is Necessary
A full drain becomes necessary when you need to resurface the pool, repair the shell, or perform major structural work. It may also be required if your water chemistry has become severely imbalanced over many years. However, a full drain should always be planned carefully and carried out by a professional whenever possible.
If you are in a neighborhood like Power Ranch or Seville in Gilbert, where homes sit on flat desert terrain, groundwater risks may vary. Therefore, always consult with a pool technician who knows your local soil and water table conditions before committing to a full drain.
How to Protect Your Pool Shell During and After Draining
Once you drain pool water, the clock is ticking. Here is a short checklist to protect your shell from damage while it is empty.
- Work quickly. Schedule repairs or cleaning before you start draining so crews are ready to go immediately.
- Avoid peak heat hours. If possible, drain overnight or in the early morning to reduce sun exposure.
- Keep the area shaded. Use temporary shade structures or tarps if you must leave the pool empty for any period of time.
- Inspect the shell immediately. Look for cracks, stains, or soft spots as soon as the pool is empty so repairs can begin right away.
- Refill promptly. Start the refill process as soon as any needed work is complete.
Finally, make sure your water source is ready. Gilbert tap water is hard, so you will want to test and balance your chemistry as soon as refilling is complete. The Valley Pool team can help you get your chemistry right from the start.
Frequently Asked Questions About Pool Draining in Gilbert AZ
How often should I drain pool water in Arizona?
Most pool professionals suggest a full drain every three to five years, depending on your water quality and usage. However, partial drains may be needed more frequently to manage TDS and calcium hardness levels specific to the East Valley water supply.
Can I drain my pool into my yard?
This depends on your chlorine levels and local regulations. Heavily chlorinated water can damage grass and plants. Additionally, Gilbert and nearby cities have discharge rules you must follow. Always dechlorinate the water and check local guidelines before draining onto your property.
How long does it take to drain a pool?
The time depends on the size of your pool and the pump you use. A standard submersible pump can drain a typical residential pool in several hours. However, the refilling and rebalancing process adds additional time, so plan your project over at least one to two full days.
What happens if I drain my pool at the wrong time?
Draining during extreme heat can crack your pool shell within hours. Draining during a wet period can cause the shell to lift or shift from hydrostatic pressure. Because of this, timing is critical and professional advice is strongly recommended before you begin.
Do I need a permit to drain my pool in Gilbert?
In most cases, a permit is not required simply to drain a pool. However, you must follow local discharge regulations regarding where the water goes. If you are unsure, contact the Town of Gilbert directly or ask your pool service technician for guidance.
Let Valley Pool Service Help You Drain Pool Water Safely
Draining a pool is not a project to rush or take lightly. The risks are real, especially in Arizona’s unique climate. However, with the right preparation and professional support, the process can go smoothly and protect your pool for years to come.
At Valley Pool Service, our experienced Gilbert technicians understand the local conditions, water quality, and equipment that East Valley pools require. We serve homeowners throughout Gilbert, Chandler, Mesa, Queen Creek, and the surrounding communities. Our team will inspect your pool, explain your options clearly, and help you decide the safest and most effective approach.
Whether you need a one-time drain and clean or ongoing pool maintenance, we are ready to help. Contact Valley Pool today to schedule a service visit and keep your pool in top condition all year long.
