10 Best Pond Liners 2025 in the United States

The Lifeguard 15 ft. x 20 ft. EPDM Pond Liner stands out as a strong choice for anyone looking to build or improve an outdoor pond or water feature. Made from 45-mil thick EPDM rubber, it offers excellent durability and flexibility. This thickness balances toughness with the ability to easily shape around curves and shelves, making it user-friendly for DIY projects. EPDM material is known for being UV resistant, so this liner holds up well under sunlight without cracking or becoming brittle over time, unlike some vinyl alternatives. Its fish and wildlife safety certifications mean it’s suitable for koi ponds, turtles, and aquatic plants, which is important if you want a healthy environment for pond life.

The liner’s size is a common medium-large option, suitable for many standard pond shapes and sizes, though very large ponds might require joining multiple liners. One minor consideration is that at about 40 pounds, it’s somewhat heavy, so handling during installation might need two people. Also, while it’s well-rated and backed by a 25-year warranty, this liner is designed primarily for outdoor freshwater settings rather than specific industrial uses.

This liner provides a reliable, durable, and safe pond lining solution, making it ideal for hobbyists or garden enthusiasts who want a long-lasting and easy-to-install option.

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 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.