Order Your Heavy-Duty Pond Liners From Us!
Pond liners are used in residential, commercial, and industrial applications to improve the aesthetics of an outdoor space and to manage, treat, and store water and other chemicals. Quality is always the priority for a large pond liner because it’s crucial to have a reliable material to prevent seepage into the surrounding soil and maintain the shape and structure of the pond and water levels in the ponds. We are ready to help you find what you need.
Contact us today (833) 261-6501 to request a quote or sample for Pond Liners, Geomembranes, or Geotextiles:


What are the Different Types of Large Pond Liner Materials that Americover Offers?
A large pond liner typically starts at 22.5’ x 50’ but can be fabricated into much larger sizes. Our most commonly purchased liner for ponds is HDPE, but we offer a range of heavy-duty liners and geomembranes. All of our liners are designed with cold-crack resistance and UV inhibitors to ensure durability for outdoor use. Here are some of the other options available:
- HDPE – Smooth & Textured
- LLDPE – Smooth & Textured
- Virgin Grade LLPDE & HDPE
- Heavy Duty String Reinforced Liners
- EPDM
- PVC Potable & Fish Grade
- Reinforced & Non-reinforced Polypropylene
- Woven Coated Polyethylene
Call (833) 261-6501 to discuss your product needs today!
Where Can I buy a Large Pond Liner, and How Much Does it Cost?
Americover has been a trusted source for large pond liners for over 30 years. We price quote liners for ponds by the square foot. The price range can get pretty expensive depending on the type of pond liner material you choose, with EPDM being the most costly choice. Knowing how many square feet of product you’ll need for your pond liner project is helpful in expediting a quote. You can use our calculator to help determine how much you will need. Then, when you are ready to order, call (833) 261-6501 to discuss your product needs.
Pond Liner Size Calculator
To calculate the liner size for your pond, please enter the dimensions in feet. If you have fractions of a foot, enter them in decimal form.
- Enter the shorter distance in the width box and the longer distance in the length box.
- The “max. depth” refers to the deepest part of your pond.
- The final calculation includes an additional 2 ft per side to accommodate an anchor trench.

If you would like assistance with this process, please contact us at: Phone 800.747.6095.
Pond Liner Calculator Disclaimer
For estimating purposes only. The Pond Liner Size Calculator provides an approximate liner size based solely on the dimensions you enter. Results are not a guarantee of fit and are not a substitute for professional measurement, design, or engineering.
What the calculator assumes. The calculation assumes a rectangular pond with a single maximum depth and adds 2 ft per side for an anchor trench. It does not account for irregular or freeform shapes, shelves or tiered depths, side slopes, waterfalls, streams, seams, overlap, underlayment, or site-specific conditions. Your actual liner requirements may be larger than the calculated result.
Your responsibility. You are solely responsible for the accuracy of the measurements entered and for verifying the liner size, material, and thickness appropriate for your project before ordering. When in doubt, round up.
No warranty. Americover, Inc. makes no warranty, express or implied, regarding the accuracy, completeness, or suitability of calculator results for any particular purpose.
Limitation of liability. To the fullest extent permitted by law, Americover, Inc. is not liable for any loss, cost, or damage, including product, labor, installation, shipping, or project delay costs, resulting from the use of this calculator or from ordering an incorrect liner size based on its results.
Returns. Custom-fabricated liners are made to your specifications and are non-returnable. Eligible stock items may be returned within 90 days of delivery in original packaging with prior authorization, subject to a 25% restocking fee plus shipping costs.
Confirm before you order. Your Americover account manager can review your dimensions and help confirm the right size before fabrication. Call (833) 261-6501, Mon–Fri, 7:30 AM – 4:30 PM PST.
By using this calculator, you acknowledge and agree to these terms.
Understanding Pond Liner Thickness:
Choosing the Right Mil for Your Application
When selecting a pond liner, the mil thickness plays a crucial role in its durability, puncture resistance, and overall effectiveness. Mil refers to the thickness of the liner material, with 1 mil equaling 1/1,000 of an inch. The thicker the liner, the more durable and long-lasting it will be, but the cost will typically increase as well. Choosing the right thickness for your pond liner ensures optimal performance based on your specific needs, whether you’re managing a small garden pond or a large commercial pond.
Here are common mil thicknesses for pond liners and the most suitable applications for each:

20 mil Pond Liners
Best For: Small to medium-sized ponds, water gardens, and decorative ponds.
- Ornamental ponds: Ideal for decorative water features and garden ponds where durability is important, but the risk of heavy foot traffic or large animals is low.
- Fish ponds (smaller): Great for ponds with minimal fish populations or smaller koi ponds.
- Water gardens: Suited for water gardens with plants and small fish where the liner will not be exposed to heavy abrasion.

30 mil Pond Liners
Best For: Residential ponds, fish ponds, and small commercial ponds.
- Fish ponds (medium-sized): Provides additional protection for ponds with moderate fish activity, ensuring durability and resistance to punctures from rocks or roots.
- Livestock ponds: Suitable for ponds that supply water to livestock, where the liner needs to withstand some wear and tear.
- Water features in high-traffic areas: Ideal for ponds in locations with occasional foot traffic or light mechanical usage.

40 mil Pond Liners
Best For: Larger ponds, including koi ponds and commercial applications.
- Koi ponds: Offers superior durability and flexibility to handle the specific needs of koi fish, including deeper and more robust ponds.
- Commercial fish farms: Ideal for large-scale fish breeding or aquaculture projects that require enhanced durability and resistance to frequent use.
- Large residential ponds: Suitable for large water features or decorative ponds with higher demands for durability and longevity.

60 mil Pond Liners
Best For: High-demand commercial ponds, stormwater retention ponds, and large agricultural applications.
- Stormwater management ponds: Provides an extra-thick, durable lining for retention or detention ponds where water containment is critical.
- Aquaculture: Used in fish farming operations requiring thicker liners to withstand constant water movement and chemical exposure.
- Large agricultural ponds: Ideal for agricultural applications like irrigation ponds, where the liner needs to withstand substantial pressure, weight, and potential punctures from machinery or livestock.

80 mil Pond Liners
Best For: Heavy-duty applications, including large commercial and industrial ponds.
- Mining ponds: Perfect for the containment of chemicals or wastewater in mining operations.
- Landfill covers and liners: Used for large containment areas that require resistance to chemicals, punctures, and UV exposure.
- Heavy-duty commercial ponds: Suitable for very large ponds in agricultural or industrial settings where long-term durability and puncture resistance are crucial.

100 mil Pond Liners
Best For: Extremely high-demand commercial, industrial, and agricultural applications that require the ultimate in durability and resistance.
- Large-scale aquaculture: Perfect for massive fish farming operations where the liner will be exposed to constant wear, movement, and chemical exposure.
- High-volume stormwater ponds: Ideal for municipalities or large commercial properties with massive stormwater retention needs.
- Mining and waste containment: Excellent for extremely heavy-duty applications like mining ponds, landfills, or chemical containment where the liner must endure harsh environmental factors and large amounts of weight.
- Large agricultural irrigation and livestock ponds: When maximum durability and longevity are required for agricultural water containment.
Choosing the Right Mil Thickness for Your Pond
Selecting the appropriate mil thickness depends on the size of your pond, its intended use, and the environmental conditions it will face. For smaller ponds or decorative features, a 20-30 mil liner should suffice, while larger ponds, especially those used for aquaculture, stormwater management, or commercial purposes, will benefit from thicker liners (40 mil and above) to ensure long-lasting performance.
When in doubt, Americover’s experts can help you choose the perfect pond liner thickness for your specific needs. Our wide range of liners, from 20 mil to 100 mil, offers solutions for ponds of all sizes and applications.
What type of pond are you building?
This is a brief list of applications for geomembrane pond liners for which we help customers find solutions. To determine if we have a heavy-duty liner suitable for your specific needs, you can find more information on our blog, which covers 50+ applications for heavy-duty liners.
Why Source with Americover?
At Americover, we specialize in providing heavy-duty liners and plastic sheeting solutions to industries worldwide. All our large pond liner products are manufactured in the US within a controlled quality environment. Stock rolls of our US-made materials are readily available for direct shipping to your job site.
Don’t settle for standard field-seaming industry choices if your project requires custom sizes. Our expert team can assist you in creating factory-seamed custom sizes and 3D Drop-in Tank Liners. This factory-seaming process enables quicker welding, higher peel adhesion, and bond, lower costs, and can be tailored to fit any project. In addition to liners, we also supply materials such as geotextiles, drainage mats, tarps, covers, vapor barriers, and more to meet your projects’ needs.

Check out our online selection of specialty plastic building solutions. Contractors and distributors are eligible for special pricing and volume-based discounts on select products, call us at(833) 261-6501 Our online inventory is just our retail selection, which means we can often source items you may not see here.
Related Resources
Heavy Duty Liner Applications
More questions about Heavy Duty Liners? Download this guide.
Americover’s Product Catalog
Browse our full inventory of vapor barrier and crawl space encapsulation liner products.
For Contractors and Distributors, we offer special pricing, volume discounts, short lead times and a dedicated account manager who will work with you to get exactly what you need. If you would like to speak with a representative, contact us at (833) 261-6501.











