How to Fix a Leaking Pool Skimmer Basket: Step-by-Step Guide

A pool skimmer is the first line of defense against leaves, bugs, and debris — and when it starts leaking or stops working efficiently, it can quietly cost you gallons of water per day and strain your pump.

A pool skimmer is the first line of defense against leaves, bugs, and debris — and when it starts leaking or stops working efficiently, it can quietly cost you gallons of water per day and strain your pump. The good news is that most skimmer problems come down to a cracked basket, a failed seal, a broken weir door, or a loose pipe connection — all of which are DIY repairs that take less than a morning to handle.

Understanding Your Pool Skimmer

Before you start, know what you are working with. A standard in-ground pool skimmer is a plastic box set into the pool wall at the water line. It has four main components:

• The throat (opening): The rectangular opening at the pool surface where water flows in.
• The weir door: The hinged flap inside the throat that creates surface skimming action.
• The basket: The removable plastic basket that catches debris before it reaches the pump.
• The pipe connections: The suction line running to the pump and sometimes an equalizer line running to the main drain.

Leaks can come from the basket area (if the basket is cracked and debris is bypassing it), from the skimmer throat seal where it meets the pool wall, or from the pipe connections at the bottom of the skimmer body.

What You Need

• Replacement pool skimmer basket — match to your skimmer brand and model
• Pool putty or underwater epoxy — for sealing cracks and gaps
• Replacement weir door (skimmer flap) — if the existing one is broken or missing
• Pool-safe silicone sealant
• Flathead screwdriver
• Needle-nose pliers
• Garden hose
• Bucket

Step 1 — Turn Off the Pool Pump

Always shut off the pool pump before working on the skimmer. Working with the pump running can pull your hand or tools into the suction line, and it makes it impossible to accurately inspect the water level behavior. Turn off the pump at the breaker or the pump controller and wait a full minute for the system to depressurize.

Step 2 — Remove and Inspect the Basket

Lift the skimmer lid and pull out the basket. Inspect it carefully for cracks, holes, warping, or missing sections. A cracked basket allows debris to bypass directly into the pump basket, accelerating pump wear. If the basket is cracked or deformed, replace it.

Match your replacement basket by brand and skimmer model. Most major skimmer brands — Pentair, Hayward, Sta-Rite — have model numbers printed or embossed on the skimmer lid or body. Take the old basket to the pool supply store as a size reference, or order by model number online.

While the basket is out, reach into the skimmer and feel around the bottom for any rough spots, cracks, or debris that has accumulated past the basket.

Step 3 — Inspect and Replace the Weir Door

With the basket removed, look at the weir door in the skimmer throat. It should swing freely on its hinge pins. Test it: push it back and forth with your finger. It should move easily in both directions and return to a slightly angled position under the force of the water current.

If the weir door is cracked, broken, stuck, or missing entirely, replacement is simple. Most weir doors snap onto hinge pins on the sides of the skimmer throat opening. Use your fingers or needle-nose pliers to flex and pop the old door off its pins, then press the new door onto the same pins until it clicks into place. Test the swing again.

A correctly functioning weir door improves skimming efficiency dramatically and is worth replacing even if it is just sticky or sluggish.

Step 4 — Check the Skimmer Body for Cracks

With the basket out and the pump off, look carefully around the inside of the skimmer body — the walls, the bottom, and especially the area where the suction pipe exits at the bottom of the skimmer. Run your finger along the pipe collar and feel for any gap or roughness.

Small cracks in the skimmer body can be repaired with two-part pool putty. Knead the two putty components together until the color is uniform, then press it firmly into the crack or gap. Pool putty works in wet conditions and cures hard. Smooth it with a wet finger and allow it to cure according to the product directions (usually 24 to 48 hours) before running the pump.

For larger cracks or damage to the skimmer throat where it meets the pool wall, the pool may need to be drained below the skimmer level for a proper repair with silicone sealant or hydraulic cement.

Step 5 — Inspect the Skimmer Throat Seal

The skimmer throat (the rectangular opening in the pool wall) is sealed between the skimmer body and the pool wall material — usually with silicone, pool putty, or a rubber gasket depending on pool construction. This seal can deteriorate over time, especially in pools with significant temperature swings or chemical fluctuations.

With the pool level at normal operating height, inspect the seam around the outside edge of the skimmer throat opening from inside the pool. Any visible gap, crumbling material, or dark staining (indicating water tracking) should be addressed with fresh pool-safe silicone or pool putty.

Step 6 — Reinstall the Basket and Test

Once any putty or sealant has cured, reinstall the skimmer basket, making sure it seats fully and evenly in its recess. Replace the skimmer lid. Turn the pump back on and watch the skimmer operation for several minutes. Water should flow smoothly through the throat, the weir door should oscillate naturally, and the basket should remain fully seated and submerged.

Check the pool level over the next 24 hours to confirm the leak has stopped.

Preventing Future Skimmer Problems

• Check and clean the basket at least twice per week during swim season.
• Keep pool chemistry balanced — low pH accelerates deterioration of plastic skimmer components and pipe seals.
• Before closing the pool for winter, blow out the skimmer lines and plug the throat to prevent freeze damage to the skimmer body.

Related Reading

• How to Clean a Pool Filter
• How to Balance Pool Chemistry
• How to Winterize an Above-Ground Pool