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How to Winterize and Store Your Water Pump: A Complete Cold-Weather Guide
Why Winter Storage Matters
Water left inside a pump can freeze, expand, and crack the housing, impeller, or seals — causing permanent damage that voids warranties and requires costly replacements. Whether you're storing a sump pump, pool pump, or utility pump for the off-season, a few simple steps can extend its lifespan by years.
This guide walks you through exactly how to winterize and store your submersible water pump safely.
Step 1: Know When to Start
Begin winterizing your pump before the first hard freeze in your area. For most of the northern United States and Canada, this means acting before late October or early November. Don't wait until freezing temperatures arrive — by then, damage may already be done.
- Sump pumps: Winterize if your basement pit is likely to freeze or if you're leaving the property unoccupied
- Pool pumps & cover pumps: Winterize as soon as pool season ends, typically late September to October
- Utility & transfer pumps: Drain and store any pump that won't be used for more than 2–3 weeks in freezing conditions
Step 2: Disconnect and Remove the Pump
- Turn off power to the pump at the circuit breaker
- Unplug the power cord and remove it from any extension cord or outlet
- Disconnect discharge hoses and pipes
- Carefully lift the pump out of the pit, basin, or pool
Safety tip: Always cut power before handling any submersible pump, even if the water level is low.
Step 3: Flush and Drain the Pump
This is the most critical step. Any water remaining inside the pump body can freeze and expand, cracking the housing or warping internal components.
- Hold the pump upright and tilt it slowly in all directions to drain water from the housing
- Run the pump briefly (2–3 seconds) out of water to expel residual moisture — do not run dry for more than 5 seconds
- For pool cover pumps with check valves: remove the check valve and drain it separately
- Allow the pump to air dry for 30–60 minutes before storage
Step 4: Inspect Before You Store
Winter storage is a good time to catch small issues before they become expensive repairs in spring.
- Check the power cord for cuts, fraying, or exposed wires
- Inspect the float switch — make sure it moves freely and isn't cracked or corroded
- Look at the discharge port for debris or mineral buildup; rinse with clean water if needed
- Check the impeller (the spinning part at the base) for visible damage or blockage
If you notice anything that needs repair, now is the ideal time — so the pump is ready to go when you need it in spring.
Step 5: Store Correctly
Where and how you store the pump matters as much as the prep work.
- Location: Store indoors in a dry, temperature-controlled space — a heated garage, utility room, or basement shelf works well. Never store in an unheated shed or outdoors.
- Position: Store upright when possible to prevent seal distortion
- Float switch: Don't store anything on top of the pump that could compress or damage the float switch
- Power cord: Coil loosely and secure with a velcro strap — avoid tight coiling, which can damage the wire over time
- Bag or cover: Place the pump in a clean plastic bag or cover with a cloth to keep dust and pests out
Step 6: Spring Start-Up Checklist
When the season turns, follow these steps before putting your pump back into service:
- Inspect the pump again for any damage that may have occurred during storage
- Test the float switch manually before submerging
- Reconnect the discharge hose and check for leaks at all connections
- Lower the pump into the pit or basin, then restore power
- Pour a bucket of water into the pit to trigger the float switch and confirm the pump activates correctly
Quick Reference: Winterization by Pump Type
| Pump Type | Drain | Storage Temp | Key Watch-Out |
|---|---|---|---|
| Sump Pump (stainless/cast iron) | Yes — tilt to drain fully | Above freezing | Float switch corrosion |
| Pool Cover Pump | Yes — remove check valve | Above freezing | Check valve cracking |
| Sewage/Effluent Pump | Yes — rinse with clean water first | Above freezing | Seal damage from dry storage |
| Utility/Transfer Pump | Yes — run briefly out of water | Above freezing | Impeller debris |
When to Replace Instead of Store
If your pump is more than 5–7 years old and showing signs of wear — reduced flow rate, unusual noise, frequent cycling — winter is a smart time to replace it rather than store it. Having a fresh pump ready for spring means you're protected the moment water levels rise.
Browse our full range of submersible sump pumps, pool pumps, and sewage pumps to find the right replacement before the season ends.