Pool Cover Pump: How to Remove Standing Water from Your Pool Cover
A pool cover pump is a small submersible pump that removes standing water from on top of your winter pool cover. Without one, accumulated water from rain and snow melt can weigh hundreds of pounds, collapsing the cover into the pool, damaging it, and making spring removal extremely difficult. Automatic cover pumps are the most practical option and run $50-$150 for most residential setups.
If you’re new to seasonal pool care, our pool maintenance guide for beginners covers what to prioritize throughout the year.
Is This Guide For You?
This guide is for you if:
- You have a solid winter tarp cover or solid safety cover
- You’ve noticed water pooling on top of your cover
- You’re deciding between a manual vs automatic pump
This guide is NOT for you if:
- You have a mesh safety cover. Mesh covers allow rain to drain straight through, so you only deal with debris on top, not standing water.
- You’re choosing which type of winter cover to buy in the first place. See our complete pool winterizing guide for cover type comparisons.
Why You Must Remove Standing Water from Your Pool Cover
Most pool owners underestimate how much water actually weighs. One inch of standing water over a standard 15x30 foot solid cover works out to approximately 2,800 lbs. That’s not a typo. Water weighs 8.3 lbs per gallon, and even a modest rain event deposits significant volume.
Here’s what happens when you let it accumulate:
- The cover sinks into the pool. Once a cover dips below the water line, it drags debris from the surface directly into your pool water. That’s algae, leaves, pollen, and whatever else settled on top all winter.
- Spring removal becomes a two-person disaster. Six inches of standing water on a 15x30 cover adds over 16,000 lbs. At that point you need a pump regardless, plus two or three people to wrestle the soaked cover off.
- The cover tears or deforms permanently. Solid tarp covers stretched under sustained weight lose their shape. Safety covers with submerged anchors get pulled at angles they’re not designed for.
- Ice locks everything in place. Standing water that freezes on top of the cover adds weight AND makes the cover rigid and unmovable until the ice thaws. In the Midwest and Northeast, this is a real problem from November through February.
- Mosquitoes breed in late winter. Stagnant water on top of your cover from February onward creates a breeding ground before you’ve even thought about opening the pool.
The fix is straightforward: keep the water pumped off. An automatic cover pump does this with zero monitoring on your part.
Types of pool cover pumps
There are two main categories, with one hybrid option:
| Type | How It Works | Price | Pros | Cons |
|---|---|---|---|---|
| Manual submersible | Place in water, runs when plugged in, unplug when done | $30-$80 | Cheapest; simple with no moving parts | Must monitor; easy to forget during long trips |
| Automatic submersible | Float switch activates when water reaches ~1/2-1 inch depth | $50-$150 | Hands-free; runs overnight without intervention | Slightly more expensive; float can stick |
| Automatic pump with hose kit | Complete kit with pump, discharge hose, and sometimes storage bag | $60-$180 | Ready to use out of the box | Same trade-offs as automatic; check hose length |
We’ve found manual pumps work fine if you’re checking the pool every week during winter freeze-thaw cycles. For anyone who travels or goes more than a couple of weeks between checks, the automatic version is the right call. You should not have to think about your pool cover in January.
How to Choose a Pool Cover Pump
The specs that matter:
GPH (gallons per hour)
- Look for at least 500-1,500 GPH for residential covers
- Higher GPH handles fast snowmelt events where water accumulates faster than a slower pump can clear it
- For most inground pools, 850-1,100 GPH is sufficient
Discharge hose length
- Most pumps include 25 feet of discharge hose; upgrade to 50 feet if your deck is long
- Route discharge to a lawn, driveway, or storm drain, at least 10 feet from the pool area
- Do not discharge into ornamental flower beds. Winterizing chemicals including algaecide and metal sequestrant remain dissolved in cover water and can damage sensitive plants. See the EPA WaterSense pool water efficiency{:target=“_blank”} page for disposal guidelines.
Cord length
- Standard cords run 25-30 feet. Measure from your nearest outdoor outlet to where the pump will sit.
- Do not use a standard extension cord submerged or sitting in water. If you need extra reach, use a heavy-duty outdoor-rated extension cord and keep the connection point elevated and dry.
- Always plug into a GFCI-protected outlet. Per OSHA guidance on GFCI protection for wet environments{:target=“_blank”}, ground fault protection is required wherever water and electricity are combined.
Float switch quality
- This is the single component that fails most on automatic pumps. A stuck float means the pump either runs dry constantly or never activates.
- When reading reviews, look specifically for comments about float reliability. A pump with a great GPH rating but a flimsy float is a liability.
Our price sweet spot: $80-$120 for a reliable automatic pump with documented good float switch performance. Below that range, we’ve consistently seen float-switch failures within the first winter.
How to Use a Pool Cover Pump
Manual pump:
- Place the pump in the deepest water pocket on the cover. Water runs to the low point, so put the pump there.
- Route the discharge hose to a drain area at least 10 feet from the pool.
- Plug into a GFCI outlet.
- Monitor the water level. Unplug when water drops to roughly 1/4 inch. Running the pump dry overheats the motor and shortens its life significantly.
Automatic pump:
- Place the pump in the center of the cover or the lowest point.
- Route the discharge hose away from the pool and garden beds.
- Plug into a GFCI outlet.
- The float switch handles the rest. When water reaches the activation depth (usually 1/2-1 inch), the pump runs. When water drops below that threshold, it shuts off.
- Check the float switch monthly. Lift and release it manually to confirm it moves freely.
After winter, bring the pump indoors before storing it. Repeated freeze-thaw cycles shorten pump motor life faster than anything else.
Troubleshooting cover pump problems
Pump runs but water doesn’t pump out The intake screen is blocked by leaves or debris. Unplug the pump, pull it out, and clear the intake. This is the most common issue.
Automatic pump not activating The float switch is stuck in the down position. Unplug the pump, manually lift and release the float several times. If it stays stuck, replace the float assembly (usually available for $10-$20 as a replacement part).
Pump runs dry and overheats Float switch stuck in the up position, so the pump thinks there’s always water. Manual reset and monitoring while you investigate.
Hose keeps disconnecting at the fitting Winter cold makes push-fit connections brittle. Use hose clamps to secure all connections before winter. PVC hose clamps cost under $5 and eliminate this problem entirely.
Water level not dropping despite the pump running The pump’s GPH rating is lower than your water accumulation rate during heavy rain or snowmelt. We recommend upgrading to a higher-capacity model or running a second pump during major storm events.
For ongoing pool water management questions, see our guide on pool water chemistry to understand how cover runoff can affect your balance when you open in spring.
FAQ
Do I need a pool cover pump?
If you have a solid tarp cover or a solid safety cover, yes. Solid covers don’t drain rain or snow melt, so water accumulates on top. Left unchecked, the weight damages the cover and makes spring removal difficult. Mesh safety covers allow rain to pass through, so you only need to manage debris, not standing water.
How often should I run the pool cover pump?
An automatic pump runs continuously as needed, so you don’t track frequency. For a manual pump, run it after every significant rain event or snowmelt period. In wet climates, this may mean every few days during November through March. Check the Pool and Spa Foundation consumer resources{:target=“_blank”} for regional pool care calendars.
Can I leave a pool cover pump out all winter?
Yes. Cover pumps are rated for outdoor use and designed to sit in cold water. Bring the pump indoors during extended hard freezes (below 20°F for more than a few days) if you can. This extends motor life but is not required for pump survival.
What size pool cover pump do I need?
For residential pools, 500-1,500 GPH handles most situations. A standard 15x30 pool (675 sq ft) accumulating 1 inch of rain equals about 420 gallons, so even a 500 GPH pump clears that in under an hour. Higher GPH matters during heavy snowmelt periods when multiple inches accumulate quickly.
Can the pool cover pump discharge into my lawn?
Yes, with one exception. Discharge to lawn or driveway is fine. Avoid ornamental garden beds or vegetable gardens. Pool cover water retains winterizing chemicals including algaecide (polyquat-based) and metal sequestrant, which can affect sensitive plants.
For filter health after a long winter, see our guide on pool filter maintenance before your first pump-up in spring.