How to Put Two Fish Ponds Together in a Back Yard

Updated February 21, 2017

Small fish ponds are installed by using EPDM pond liners that are laid into a hole that has been dug in the ground. If you need to join two fish ponds together in your back yard, a section of pond liner is needed. This allows you to connect two ponds together to create one large pond. This is done by first determining the distance between the two existing fish ponds in your backyard.

Measure the distance between the two ponds with the tape measure and add 1 foot to this measurement.

Lay out the pond liner on the ground and measure the length. Cut the pond liner to the measurement in step 1 with the scissors.

Mark the top and bottom edges near the two fish ponds to join with a stake. Drive the stakes into the ground with the hammer.

Attach a piece of string to each stake to mark the edges where the ponds will join.

Excavate the dirt that is between the two fish ponds with the shovel using the string as a guide. Dig down to the depth for the two ponds. Remove enough dirt to expose the sides of the two ponds.

Clean the sides of the pond liners with a cloth to remove the dirt. Allow the liner to dry and then wipe the sides with another cloth that is damp with rubbing alcohol. This will help the liners to adhere when they are glued.

Make a 6-inch cut in each corner of each fish pond liner with the utility knife. This is needed so that the existing liners will lay flat on the ground.

Lay the pond liner in the hole that is connecting the two ponds. Apply EDPM primer to the backside of the pond liner and 6 inches on each side of the pond liner that you cut in step 2.

Remove the backing from a piece of EDPM adhesive tape. Lay the piece of adhesive tape on the 6-inch edge on one side of the pond liner.

Peel off the top section of adhesive tape. Secure the adhesive to the bottom of one fish pond. Press the edges of the pond liners to adhere them together.

Repeat steps 8 and 9 to secure the pond liner to the other fish pond. Allow the glue to dry for at least 12 hours and then fill the joined ponds with water.


EPDM stands for Ethylene Propylene Diene Monomer.

Things You'll Need

  • EPDM pond liner
  • Tape measure
  • Scissors
  • Stakes
  • Hammer
  • String
  • Shovel
  • Cloth
  • Utility knife
  • EDPM primer
  • EDPM adhesive tape
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About the Author

Cameron Easey has over 15 years customer service experience, with eight of those years in the insurance industry. He has earned various designations from organizations like the Insurance Institute of America and LOMA. Easey earned his Bachelor of Arts degree in political science and history from Western Michigan University.