The 100 Gallon Rainwater Harvesting Tank is a great size to store your collected rainwater in ANY residential back yard! This tank will store twice the rainwater as a standard sized rain barrel and will take up the same foot print. This 100 gallon rainwater tank is small enough to hide behind bushes or a small privacy fence, which is required by some Home Owners Association’s.

Rain Harvesting or Rainwater Collection is the catchment and storing of rainwater for use in a later date. There are numerous reasons for collecting rainwater. Rainwater collected from roofs of houses can make an important contribution to the general availability of water as well as household water cost savings. Whether you would like to water your plants, garden, home foundation, or have an outdoor water source for hand-washing or pressure washing, rainwater is FREE and you should collect it. If you don’t, we use energy to pump it back out of the ground! Collecting rainwater is a self-sufficient way getting water and also provides a net positive impact on the environment. Whether your motivation is one or all of these, a Rainwater Harvesting Tank is arguably the most important component of your system!

Poly-Mart 100 Gallon Rainwater Harvesting Tank Features:

  • Poly-Mart 5 Year Warranty

  • 100 Gallons of Capacity

  • 30”D x 42”H

  • 38 lbs. (Shipping Weight of 78 lbs.)

  • 12″ Stainless Steel Strainer Basket (12″ Tank Screen Cover upgrade is available upon request)

  • 3″ Stainless Steel Screened Overflow Assembly

  • 3/4″ Bulkhead Fitting for easy Spigot Installation

  • 3/4” Bottom Bulkhead w/ Plug

  • (4) 6 1/2″ x 8 1/2″ Top Dome Flats

  • (4) 8″ x 7″ Bottom Flat

100 Gallon Rainwater Harvesting Tank

 Poly-Mart Rainwater Tanks are assembled specifically for the proper collection of rainwater! Sold exclusively through us in Colorado, Poly-Mart Rainwater Harvesting Tanks are available in various sizes as well as 13 different colors! The Poly-Mart 100 Gallon Rainwater Harvesting Tank is designed with 4 Dome Flats on the top of the tank and 4 Layout Flats at the base of the tank. These 8 flats surfaces set our tank design apart from others and allow you to daisy chain tanks together or provide flat surfaces for installation of additional outlet/inlet fittings, Tank Over Flow FittingsFloat SwitchesTank Gauges and other Rainwater Harvesting Accessories. Your installer or contractor will love having flexibility when needing to install additional fittings where you need them most in your application. 


Poly-Mart 100 Gallon Rainwater Storage Tanks come with a16″ Stainless Steel Mesh Tank Screen installed on the top of the tank. The Tank Screen (or sometimes referred to as a Strainer Basket) is the rainwater entry point of the tank. It’s primary job is to keep mosquitoes out of the rainwater tank and allows a large entry point of pre-filtered rainwater to enter the tank. Large debris like sticks and leaves should be filtered out prior to reaching the Strainer Basket by using a Rain Head and/or a First Flush Diverter. There is also a stainless steel mesh screened overflow assembly, outlet bulkhead fitting and a 3/4″ bulkhead fitting for a water hose spigot. The stainless steel mesh screened overflow assembly is designed for directing overflown water during large rain storms while doubling to keeping pests & mosquitoes out of the tank. Our 3/4″ bulkhead fitting is placed at a height that enables you to install a spigot and fit a watering can underneath for filling. Collected rainwater is technically non-potable. Do not drink collected rainwater without proper filtration.

Please contact us for proper filtration methods.

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Rain Harvesting & Water Storage Tanks for Colorado  |  720.391.8828