Kayak Bilge Pump vs Sponge: How to Get Water Out of Your Kayak
Every kayak takes on some water: drips off the paddle, splash, rain, a leaky hatch, or a full swamping after a capsize. How you get it out depends on your boat. Here's what a hand bilge pump, an electric pump and a humble sponge each do well, and which combination makes sense for your kayak.
Quick answer
- Sit-inside kayaks (recreational, touring, sea kayaks): carry a hand bilge pump. After a capsize and re-entry, it's the practical way to empty the cockpit on the water.
- Sit-on-top kayaks drain the deck through scupper holes, so you generally don't need a pump for the cockpit. A sponge and a check of the hull through a hatch are useful.
- Electric pumps are mostly for expedition sea kayaks set up with a battery and switch. Not a beginner purchase.
- A sponge is cheap and great for the last bit of water. It's not fast enough for a swamped cockpit.
Why water removal matters
Water in a kayak isn't just uncomfortable. A cockpit full of water makes a sit-inside boat sluggish and much less stable because the water sloshes from side to side. That makes it easier to capsize again, exactly when you're cold and tired. Getting the water out quickly after a re-entry is a core part of kayak self-rescue.
Your boat type decides most of this
| Kayak type | Where water collects | What to carry |
|---|---|---|
| Sit-inside with bulkheads (touring / sea) | Cockpit; small amounts in hatches | Hand pump + sponge; spray skirt |
| Sit-inside recreational (few or no bulkheads) | Cockpit and whole hull | Hand pump + sponge; add float bags |
| Sit-on-top | Deck drains via scuppers; leaks into hull | Sponge; check hull through hatches |
| Inflatable | Floor (self-bailing models drain) | Sponge or small hand pump |
| Whitewater | Cockpit | Usually emptied on shore; float bags essential |
If you paddle a recreational sit-inside without sealed bulkheads, read that row twice. These boats can take on a lot of water in a capsize, and the fix is float bags fore and aft so there's less space to fill. A pump alone can't keep up with a fully swamped boat that has no flotation.
Hand bilge pumps
A hand bilge pump is a tube with a handle and a one-way valve. You put the bottom end in the cockpit and pump, and water squirts out the top over the side. It's the standard tool for sit-inside paddlers.
What to look for
- Flotation collar or foam sleeve so it floats if dropped.
- Bright colour so you can find it in the water.
- A length that fits your cockpit and can be stowed under deck bungees or behind the seat.
- A comfortable T-handle you can work with cold hands.
- Durable, corrosion-resistant construction for salt water.
- A hose option on some models, so you can pump with a spray skirt partly on.
How to use it after a re-entry
- Get stable first. Once back in the cockpit, brace or have a partner hold your bow. A paddle float on your outrigged paddle helps if you're alone.
- Partially seal the skirt. Pop the spray skirt on most of the way, leaving a gap at the side for the pump. This stops waves refilling the cockpit while you work.
- Pump steadily. Long, even strokes. Point the outlet over the side.
- Finish with a sponge if needed, then seal the skirt fully and paddle on.
Electric bilge pumps
Some expedition and sea kayakers install an electric pump in the cockpit or day hatch, wired to a battery and switch. The appeal: you can pump while keeping both hands on your paddle to brace.
The trade-offs are real:
- Installation involves drilling, wiring and waterproofing.
- The battery needs charging and checking.
- More failure points: switches, wires and connectors in salt water.
- Extra weight and cost.
For most paddlers, a hand pump and good rescue skills are enough. If you do want an electric system, plan it carefully and consider having it installed by someone experienced. Our guide to drilling a kayak covers sealing.
Sponges: underrated
A large, absorbent paddling sponge is cheap and surprisingly useful:
- Mops up the last bit of water a pump can't reach.
- Dries hatches and compartments.
- Keeps sand and grit out of footpegs and seats.
- Wipes condensation from inside hatches on cold days.
Clip it to a deck line or keep it under the bungee so it doesn't drift away. It won't empty a swamped cockpit, but every paddler should carry one.
Sit-on-top kayaks: do you need a pump?
Sit-on-tops have scupper holes that drain water from the seating area. If a wave splashes in, it drains out. You don't pump the deck.
The hull is a different story. Water can get inside through a leaking hatch, a fitting, a scupper tube or a crack. Signs include the boat feeling heavier, slower, or sloshing when you turn. Check by opening a hatch and looking or feeling inside. A sponge or small hand pump can remove water through the hatch opening.
If you find water in the hull regularly, track down the leak. Common culprits are hatch seals, worn scupper tubes and loose hardware. See our guide to hatch covers and bulkheads and to hull repair. Our article on scupper plugs explains when to plug scuppers.
Where to stow your pump
A pump you can't reach after a capsize doesn't help. Where you keep it matters as much as which one you buy:
- Under the front or rear deck bungees. The most common spot on sea and touring kayaks. It's visible, reachable and easy to grab while you're sitting in the cockpit. Make sure it's secured well enough that a wave won't strip it off.
- Inside the cockpit, behind the seat or alongside it. Keeps it out of the wind and away from waves. Some cockpits have a clip or strap for exactly this. Check that it won't stop you getting out in a wet exit.
- Clipped with a short tether. A floating pump on a short leash to a deck line won't drift away while you're climbing back in.
Avoid stowing it inside a hatch. After a capsize you won't want to open a hatch in waves to dig it out.
What a sensible kit looks like
| Paddler | Water removal kit |
|---|---|
| Casual sit-on-top on a pond or calm lake | Sponge |
| Sit-on-top angler, open water | Sponge, plus a small hand pump for the hull |
| Recreational sit-inside, sheltered water | Hand pump, sponge, float bags |
| Touring or sea kayaker | Hand pump, sponge, spray skirt, paddle float |
| Expedition sea kayaker | Hand pump plus optional electric pump, sponge, spray skirt |
A paddle float pairs naturally with a hand pump: the float steadies you while you pump. If you don't have one yet, it's worth adding at the same time.
Keep water out in the first place
- Spray skirt on sit-inside kayaks in waves or cold water. See how to choose a spray skirt.
- Drip rings on your paddle to stop water running down the shaft into your lap.
- Hatch covers that fit and are secured properly.
- Float bags in any boat without sealed bulkheads.
- Cockpit cover when storing or transporting so rain doesn't collect.
FAQ
Do I need a bilge pump for a recreational kayak?
If it's a sit-inside, a hand pump is a good idea, especially away from shore. Add float bags if the boat lacks sealed bulkheads, since it can take on a lot of water in a capsize.
Do sit-on-top kayaks need a bilge pump?
The deck drains through scuppers, so you don't pump the seating area. Check the hull for leaks through a hatch and carry a sponge.
Is a sponge enough?
For drips and splash, yes. For a swamped sit-inside cockpit, no. A hand pump is much faster.
Are electric kayak bilge pumps worth it?
For some expedition paddlers, yes. For most recreational paddlers, a hand pump is simpler, cheaper, and has fewer things to fail.
Bottom line
If you paddle a sit-inside kayak, carry a floating hand bilge pump and a sponge, and practise pumping out after a re-entry. If you paddle a sit-on-top, a sponge and an occasional check through the hatch is usually enough. Add float bags to any boat without sealed bulkheads, and you'll have far less water to deal with in the first place.