Premium 20 Mil LLDPE Pond Liner — 15×20 FT, UV-Stabilized, Fish-Safe & Puncture-Resistant

Stop Losing Water. Stop Patching Leaks. Build a Pond That Holds.

Cheap liners crack under UV, puncture on rocks, and fail at the seams within a season. This 20 mil LLDPE liner is built for permanence — thick enough to resist punctures from roots and gravel, flexible enough to conform to any shape without folding, and UV-stabilized to hold up outdoors for years without becoming brittle.

Each liner measures 15×20 feet — sized to fit backyard fish ponds, koi ponds, water gardens, and ornamental features up to 9×14 ft with 2 ft depth. Order multiple liners to cover larger installations, overlap seams for leak-free joins, or line multiple sections of a pond system.

💳 Flexible Payments Available — Split your purchase into 4 interest-free installments with Shop Pay. No hidden fees, no surprises.

Bundle Options

2-Pack — Two 15×20 ft liners. Cover one medium-sized pond or use both sides of a divided water feature independently.
Best for: single backyard pond, split water features

4-Pack — Four liners for larger installations or multi-zone pond systems. Overlap and seam for a seamless leak-proof surface on bigger builds.
Best for: large koi ponds, multi-section water gardens

6–10 Pack — For serious water feature projects — retention areas, natural swimming ponds, or commercial installs where coverage and redundancy matter.
Best for: large-scale builds, farm ponds, retention features

12–16 Pack — Maximum coverage for large farm ponds, irrigation reservoirs, and commercial water containment. Best cost-per-liner in the lineup.
Best for: farm reservoirs, irrigation ponds, commercial projects

Bundle Coverage & Cost Breakdown

How Much Liner Do You Need?

Measure your pond's length, width, and depth, then use this formula to calculate the liner size you need:

(Pond Length + 2× Depth + 2 ft) × (Pond Width + 2× Depth + 2 ft) = Liner Area Needed

Example: A 9×14 ft pond, 2 ft deep → (9+4+2) × (14+4+2) = 15×20 ft. One liner covers it perfectly.

💡 For larger ponds: overlap liner seams by at least 12 inches and use pond liner tape for a watertight join.

• 20 mil LLDPE construction — significantly thicker than budget liners, resists punctures from roots, gravel, and sharp edges
• UV-stabilized — won't crack, stiffen, or degrade from sun exposure over years of outdoor use
• 100% fish and plant safe — LLDPE is non-toxic and approved for use in koi ponds, goldfish ponds, and water gardens
• Flexible in cold temperatures — stays pliable and workable even in winter, unlike PVC which stiffens and cracks
• Conforms to any shape — bends into curves, corners, and irregular pond beds without creasing or tearing
• Seamable — multiple liners can be bonded together with pond liner tape or PVC cement for larger builds
• Covers 300 sq ft of pond surface per liner — sized for backyard ponds up to 9×14 ft with 2 ft depth

Complete Your Pond Build

Line your pond banks with weed barrier fabric before laying the liner — it blocks root intrusion from below and adds an extra layer of puncture protection between the liner and the soil.

Add Weed Barrier Fabric →

Backed by our satisfaction guarantee. If it doesn't perform, we'll make it right.