10 Best Pond Liners 2025 in the United States

The LifeGuard Pond Liner is made from 45-mil thick EPDM rubber, a material known for its durability and flexibility, making it a solid choice for various water features like ponds, waterfalls, and koi habitats. Being puncture resistant and free from plasticizers, it promises long-lasting performance without cracking or brittleness, which is important for maintaining a secure water barrier. The inclusion of an UnderGuard underlayment adds extra protection against sharp objects below the liner, reducing the risk of damage.

Its size of 20 ft by 25 ft covers a good area suitable for medium to large ponds, and the liner lays flat easily, which helps simplify the installation. This can be a big advantage for users who may not have professional installation help. Additionally, it’s certified fish and wildlife safe, reassuring that it won’t harm aquatic life in your pond.

Although the underlayment arrives in multiple pieces, requiring some extra effort to align properly during installation, and the shipping logistics and weight may require careful handling, this pond liner is a reliable, high-quality option for those wanting a tough, fish-safe liner that can handle various pond types. Its material strength and warranty provide peace of mind for long-term use.

The LifeGuard Pond Liner is made from 45-mil thick EPDM rubber, a material known for its durability and flexibility, making it a strong choice for a variety of water features like ponds, waterfalls, and koi habitats. Its thickness helps resist punctures and wear, which is important for long-lasting protection. Unlike some liners, this one doesn’t use plasticizers that can become brittle over time, so it’s less likely to crack or split in sunlight. EPDM liners generally perform well against sun damage, helping the liner last outdoors. The included UnderGuard Underlayment adds extra protection from sharp objects below the liner, which improves durability.

This liner is certified safe for fish and plants, so it won’t harm aquatic life, making it a good pick for natural ponds or aquaponics. With a size of 15 by 20 feet, it fits medium to larger ponds, but if your pond shape is irregular, the EPDM's pliability helps with custom fitting. It is fairly heavy at 97 pounds due to the material and included underlayment, so installation might require some effort or help.

The LifeGuard Pond Liner provides a reliable, fish-safe, and easy-to-handle option for anyone building or upgrading a pond, while the weight and size should be considered to ensure it suits your specific project requirements.

The HALF OFF PONDS 50 ft. x 50 ft. 20-Mil LLDPE Pond Liner is a solid choice for pond, lake, or retention basin projects, especially if you need a large, flexible liner that can handle irregular surfaces. Made from LLDPE, it offers good durability with high resistance to punctures and tears, making it reliable for long-term use. Its 20-mil thickness strikes a balance between strength and flexibility, which helps it conform well to gentle curves and smooth transitions but might struggle with very sharp corners or tight bends.

This liner is UV resistant and designed to resist damage from sunlight, with a 10-year warranty when used exposed to sun and an expected life of over 40 years if covered by earth or water, which is great for durability. Importantly, it is safe for fish and plants, so it's suitable for natural ponds and water gardens. The large 50 x 50 feet size is versatile enough for many pond sizes, though it is quite heavy and ships via freight, which means handling and installation might require some effort.

It attaches easily to waterfalls and skimmers but isn’t ideal for complex shapes with tight corners. For those looking for an economical yet strong pond liner that lasts and supports aquatic life, this product fits well, though it may require some care during installation due to its size and flexibility limits.