Owning a swimming pool is a luxury, but it also comes with considerable responsibility, especially during the off-season. One of the most overlooked aspects of pool maintenance is the proper care of the pool cover—particularly the critical task of removing standing water from it. Many pool owners neglect to pump water off the pool cover, either due to lack of awareness or time constraints. However, this simple oversight can lead to a chain of damaging consequences.
In this comprehensive article, we’ll explore what happens if you don’t pump water off pool cover, including structural damage, safety hazards, water chemistry issues, financial implications, and effective solutions to prevent these problems.
The Importance of Pool Covers in Seasonal Maintenance
Pool covers serve essential functions in swimming pool maintenance, particularly during the winter months. They protect the pool from debris, reduce evaporation, maintain water temperature, and prevent contamination from external elements. There are different types of pool covers available on the market, including solid safety covers, mesh safety covers, and thermal covers. While each has its unique benefits, one common issue applies to all types: the accumulation of water on the cover’s surface.
Why Water Accumulates on Pool Covers
Standing water can easily form on pool covers due to rain, melting snow, humidity, or condensation trapped beneath the cover. Since most pool covers are slightly concave in design to accommodate some water, it’s expected that small puddles can appear. However, when water is not regularly pumped off, it can accumulate to dangerous levels, affecting both the cover and the pool beneath.
How Pool Covers Are Designed to Handle Water
Some pool covers, like mesh covers, are designed to allow water to pass through them, reducing the need for frequent pumping. However, even mesh covers can sag if water pools on top of them or if debris clogs the mesh fabric. Solid covers, on the other hand, do not allow water through and thus require routine draining.
Consequences of Neglecting to Remove Water From Your Pool Cover
Let’s delve into the potential issues that can occur when water is left to accumulate on your pool cover. These problems can range from minor inconveniences to expensive damage requiring major repairs.
1. Structural Damage to the Pool Cover
One of the most immediate effects of standing water on a pool cover is the physical strain it places on the material. Water is heavy—each gallon weighs approximately 8.3 pounds. Over time, the added weight can stretch, sag, or tear the pool cover, reducing its lifespan and effectiveness.
- Stretching material: Excess weight can elongate the cover fabric, especially in winter when the material contracts due to cold.
- Weak spots and tears: Pooled water can create stress points that eventually lead to tears or holes.
- Improper fit: Once stretched, a cover may no longer fit tightly, which can result in more debris entering the pool.
2. Increased Risk of Cover Collapse
In areas with heavy snowfall or frequent rainfall, leaving water on the cover can be especially dangerous. If not removed, the water can freeze and become ice, adding significant load to the cover support system. This can cause:
- Broken cover frames: Support systems like water bags or cable reels can buckle under the pressure.
- Risk of falling through: Walk-on covers can become unstable, posing safety hazards to children, pets, or adults walking across them.
- Potential drowning or injury: If the cover collapses and someone falls into the pool, it could lead to accidents or drowning, especially with children.
3. Water Back-Up into the Pool
When water pools on the surface of the cover, especially with solid winter covers, it has nowhere to go. This increases the risk of the water seeping under the edges of the cover and draining directly into the pool. This is problematic for several reasons:
- Dilutes pool chemistry: Rainwater entering the pool can upset the balance of chemicals, leading to an increased risk of algae and bacteria growth.
- Raises water level: This can put pressure on the pool walls, especially in in-ground pools. If the groundwater level outside rises, an overfilled pool can cause the shell to shift or pop out of the ground.
4. Algae and Bacterial Growth Under the Cover
Standing water on the cover can lead to a stagnant environment where algae and bacteria thrive. Due to limited sunlight, airflow, and chemical exposure in this wet, dark environment, microbial growth becomes inevitable. When these microorganisms eventually wash into the pool, they can cause:
- Green or cloudy water: Algae blooms can turn the pool green and make it unsanitary for swimming.
- Increase in cleaning time: Algae can coat pool walls, ladders, and equipment, making spring opening much more labor-intensive and expensive.
5. Staining and Discoloration of Pool Surfaces
Water left on the cover may drip or drain contaminants such as dirt, leaves, bird droppings, and pollen into your pool. These foreign particles settle on the pool’s walls and floor and, over time, can lead to staining and discoloration. This staining may be:
- Hard to remove: Some stains are deep-set, especially on plaster and vinyl surfaces.
- Costly to repair: In extreme cases, you may need to acid wash the pool walls or replace sections of pool lining or tiling.
6. Damage to Pool Equipment and Accessories
The added weight and moisture can harm nearby pool equipment like filters, pumps, and heaters, especially if they are stored under the cover or near the pool area. Moreover, standing water creates a damp atmosphere conducive to rust and corrosion.
Corrosion Risks to Hardware
- Cover anchors: These often have metal components that can rust or break if submerged in water.
- Pool ladder and railings: Water that pools around or drips onto these structures may lead to metal degradation.
7. Attraction of Pests and Vermin
Standing water on a pool cover unintentionally becomes a breeding ground for mosquitoes and other pests. Mosquitoes lay eggs in stagnant water, and a few puddles on a cover can become a localized mosquito infestation. Other pests might also be attracted, adding to hygiene and comfort concerns around your pool area.
8. Increased Safety Hazards
Accumulated water on covers isn’t just a structural or chemical threat—it’s also a safety liability. Wet, slick surfaces pose a slip hazard, and when ice forms on top, the risk escalates. In particular, for homes with children or pets, the potential for injury is real.
Financial Implications of Not Pumping Water Off Your Pool Cover
Beyond physical damage and safety concerns, leaving water on your pool cover can cost you significant money over time. Let’s break down some of the financial risks associated with poorly maintained covers.
High Repair and Replacement Costs
Replacing a torn or overstretched pool cover isn’t cheap. For high-quality, reinforced winter safety covers, costs can range from $500 to $2,000, depending on pool size and cover type. Additionally:
- Professional repair fees might apply if the damage isn’t covered under warranty.
- Replacing damaged anchors or support systems adds to the overall cost.
Increased Chemical Usage
Whenever rainwater or runoff enters your pool, it disrupts the carefully balanced chemistry. You’ll typically need to:
- Add algaecide and chlorine to fight off algae growth.
- Adjust pH and alkalinity levels to maintain swimmer comfort and equipment lifespan.
- This results in higher chemical expenses and more frequent testing.
Professional Cleaning Fees
Neglecting pool cover maintenance often translates to significant labor costs at the start of the swimming season. Pool professionals charge either an hourly rate or a flat service fee for:
- Algae removal and filtration
- Scrubbing walls and vacuuming debris
- Repairing any pool surface damage
Even a few days of neglect can pile on hundreds of dollars in extra swimming pool service charges.
Preventive Measures and Solutions
The good news is that properly managing water on your pool cover isn’t complex—it just requires planning, some basic equipment, and consistent maintenance habits.
Invest in the Right Pool Cover Pump
A submersible pool cover pump is an investment that pays for itself. These pumps are designed to:
- Automatically turn on at a set water level.
- Drain the water into a safe distance from the pool area.
- Run efficiently with minimal noise and energy use.
Some cover systems come with built-in pumps, while in other cases, you’ll need to purchase a stand-alone automatic or semi-automatic pump.
Types of Cover Pumps
| Type | Operation | Pros | Cons |
|---|---|---|---|
| Automatic | Senses water and turns on automatically | Most convenient | Higher cost |
| Semi-Automatic | Needs manual activation but can be left connected | Moderate cost and good efficiency | Requires monitoring |
| Manual | Must be plugged in and monitored daily | Affordable option | Labor-intensive |
Regular Inspections and Maintenance
Don’t assume that installing a pump is the final solution. It’s important to:
- Clean and maintain the pump regularly, especially after heavy rainstorms.
- Check the hose for clogs or ice damage (in cooler climates).
- Ensure the cover is tensioned properly for optimal drainage.
Use an Oval Cover Design for Better Drainage
Some pool covers are designed with a dome-shaped center or “bull’s eye” that funnels water toward a central channel. Others have sump areas specifically for pump placement. Choosing the right cover design makes water removal more efficient.
Conclusion: Don’t Let Stagnant Water Spoil Your Pool Season
If left unchecked, water pooling on your pool cover can lead to catastrophic damage, costly repairs, and serious safety hazards. The best pool maintenance isn’t just about cleaning the water—it’s about protecting it with the right cover and ensuring that cover works as intended throughout the off-season.
By investing in a quality pump, performing regular maintenance, and staying vigilant throughout fall, winter, and spring, you can avoid the problems tied to standing water and preserve both your equipment and your peace of mind. The small daily or weekly effort of pumping water off the cover will save you hundreds or even thousands of dollars in long-term repair costs, while also offering a healthy and safe pool environment when it’s time to swim again.
So, don’t make the mistake of neglecting your pool cover just because it’s hidden away and out of sight. Make sure you’re doing everything you can to keep it dry, clean, and safe. Your pool will thank you when you dive in with clear, clean water waiting for you.
Key Takeaways
- Standing water on your pool cover may seem harmless, but it can damage the cover and compromise pool water quality.
- Pool covers can tear, stretch, or collapse under the added weight of water.
- Rain and snow left on the cover can seep into the pool and cause chemical imbalances.
- Algae and pests thrive in stagnant water beneath and on top of the cover.
- Regular pumping, even with an automatic pump, is crucial to ensuring your pool remains in top condition during the off-season.
1. Why is it important to pump water off a pool cover?
The main reason to pump water off a pool cover is to maintain the cover’s integrity and the overall safety of your swimming pool. When water is left to accumulate, it adds significant weight, which can cause the cover to stretch, sag, or tear over time. This damage could compromise the cover’s ability to keep debris, dirt, and sunlight out, which can lead to more work and expense later on. In addition, excessive water buildup poses a safety risk, especially around households with children, as it creates a potential drowning hazard.
Proper maintenance also helps preserve the quality of the water in your pool. If the cover is damaged or waterlogged, it may allow contaminants and leaves to enter the pool, which can lead to algae growth and chemical imbalances. Furthermore, standing water on your cover can serve as a breeding ground for mosquitoes, increasing the risk of pests in your backyard. Removing water regularly ensures your pool remains protected and clean throughout the off-season or during periods of inactivity.
2. What are the risks of leaving water on a pool cover?
One of the biggest risks of not pumping water off a pool cover is the potential for the cover to tear or collapse. Pool covers are not designed to support large volumes of water, and when too much weight accumulates, it can strain the seams and fastenings. In extreme cases, such as with winter covers during a heavy rainstorm or snowmelt, the cover may even sink into the pool or break entirely. This not only leads to the need for a costly replacement, but it also compromises the pool’s cleanliness and safety.
Additionally, water sitting on a cover can promote mold and mildew development, especially in humid or rainy climates. This can damage the cover material and reduce its lifespan. Accumulated water can also attract mosquitoes and create unsightly puddles, which can become a slip hazard around the pool area. Leaving water on the cover may seem like a minor issue in the short term, but it can result in long-term consequences for both the cover and the pool itself.
3. How does standing water affect a pool cover’s performance?
Standing water negatively affects a pool cover’s performance in several key ways. Most notably, it places unnecessary stress on the cover’s material, especially during prolonged periods of rain or snow. This can cause the fabric to stretch, weaken, or even puncture, leading to a loss of its protective function. Pool covers are designed specifically to keep contaminants out and to hold their shape under normal conditions, but when overloaded with water, they can no longer perform as intended, putting your pool at risk.
Another aspect of performance impact is related to UV protection and chemical balance in the pool. If the cover is weighed down and damaged, sunlight can penetrate more easily, which accelerates algae growth and chlorine evaporation. As a result, maintaining a clean and balanced pool becomes significantly more challenging and expensive after reopening it. Ensuring your cover remains free of water helps maximize filtration efficiency and overall pool health while minimizing maintenance costs.
4. Can stagnant water on a pool cover create safety hazards?
Yes, stagnant water on a pool cover can indeed create safety hazards, particularly in homes with children or pets. The puddled water can become a slipping hazard, especially after rain or wind storms when the surface becomes slick. If the cover material already has some sagging due to water accumulation, it could tear or give way under the weight of a person, leading to possible falls or drowning. This makes it especially important for families to regularly inspect their covers and remove built-up water.
In addition to physical hazards, stagnant water also attracts mosquitoes and other pests that can pose health risks. Mosquitoes lay eggs in standing water, increasing the chance of bites and potential transmission of diseases such as West Nile or Zika viruses. A neglected pool cover can inadvertently become a breeding ground for these insects, making it both an eyesore and a public health concern. Prioritizing basic maintenance such as water removal helps ensure the safety of your swimming environment and reduces associated risks.
5. What types of damage can water accumulation cause to the pool itself?
Failure to pump water off the pool cover can lead to significant damage to the pool structure as well. If the cover tears or collapses due to excessive weight, debris and contaminants can fall into the pool, necessitating extensive cleaning and chemical balancing. Additionally, in the case of in-ground pools, excessive water on the cover can cause pressure imbalances that may lead to bulging walls or liner damage. These costly structural issues often aren’t covered under warranties, making regular maintenance even more crucial.
Another concern is the potential for water damage to the surrounding decking and fencing if the cover fails entirely. Once the cover gives way, the accumulated rainwater can spill over into the pool area, causing erosion and compromising drainage systems if left unattended for long periods. Proper water removal not only prevents damage to the cover and the pool but also ensures the entire pool surroundings remain intact and safe for use.
6. How often should I pump water off my pool cover?
Pumping water off your pool cover should be a regular, proactive task especially during periods of heavy rain or snowmelt throughout the off-season. In general, inspecting your cover at least once a week and pumping off water when it accumulates to about 2 inches deep helps prevent problems. During severe weather with prolonged precipitation, more frequent checks and water removal may be required to avoid excessive buildup. These actions not only prolong the life of your cover but also keep your pool in optimal condition under the surface.
Automatic pool cover pumps can make this process easier, running as needed to remove water and prevent overaccumulation. Even with automation, however, it’s wise to manually check for water buildup occasionally to ensure the system is functioning properly. In the absence of an automatic pump, it’s important to manually pump any trapped water as soon as possible after rainfall. Regular attention to your pool cover ensures its effectiveness and protects your investment throughout the year.
7. What should I do if there’s already a large amount of water on my pool cover?
If you discover a significant amount of water on your pool cover, take action immediately to pump it off using a manual or automatic pump designed for this purpose. The key is to remove the water carefully without damaging the cover or the pool itself. If the water is icy or frozen, such as during winter, wait for it to thaw before pumping to avoid tearing the cover or stressing its seams. Remember that excessive water weight poses risks, so do not delay the removal process once conditions allow.
After draining the water, inspect the cover for signs of stress, stretching, or damage. Look for any holes, cracks, or worn fastening points that could affect its long-term performance. If possible, redistribute the cover properly once it’s free of water to ensure even tension and prevent future accumulation in localized spots. These steps help protect your cover, extend its lifespan, and maintain a safe, pristine pool environment for the next use.