How Much Does Rainwater Harvesting Cost?

by Team HomeServe
green plant in rain barrel with gutter downspout and home

Rain Barrel Installation Costs at a Glance

  • 55-gallon barrel: $100
  • System with pumps, filtration and storage: $5,000
  • Small storage tank: $150-$300
  • Large storage tank: $1,300+

Whether you’re looking for a way to live more sustainably or you just want to try to decrease your monthly water bill, rainwater harvesting provides a potential solution. But if you’re new to the concept, you’ll no doubt have questions surrounding the process. Luckily, it’s not that complicated. Just collect and store the rainwater that falls on your property.

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Here’s a look at the average price — plus the legal restrictions — of installing a system for rainwater collection.

In Which States Is It Illegal to Collect Rainwater?

Your first concern when considering harvesting rainwater may be the legality. There are currently no federal regulations regarding rainwater collection, but numerous states have laws on the books. Colorado and Utah are the strictest of these.

Because of extremely old laws dealing with water usage rights, collecting rainwater in Colorado used to be illegal. However, since 2016, each household is allowed to catch and store up to 110 gallons of rainwater. In Utah, there’s a maximum limit of 2,500 gallons for rainwater storage systems and a permit is required.

For the other states that regulate water collection, legislation is built around rules specifying how the collection must be done or how the water can be used. The majority of states have no regulations on collection. Some states even actively encourage residents to collect and use rainwater with tax credits and other incentives. Check your state’s rules here. Some localities might have restrictions or specifications, so always check local laws to ensure compliance.

a blue Rain Barrel rests under a white gutter on a home to collect rainwater

How Much Does a Rainwater Harvesting System Cost?

The cost of a rainwater harvesting system varies based on how sophisticated it is. A plastic 55-gallon barrel, for example, costs around $100, according to The Home Depot. Simply putting one outside during rain to collect the water would be the cheapest option.

Other, more involved systems designed to actively harvest the rainwater can be considerably more expensive. Based on data from, systems with filtration, purification, pumps and storage tanks can be in the neighborhood of $5,000, depending on the level of sophistication and size of storage.

How Much Does a Water Storage System Cost?

In many cases, the most expensive portion of the catchment system will be the storage component. Storing water for an extended period of time means the necessity for larger space in most cases. Even if a larger tank isn’t necessary, ensuring the water remains safe and usable is important, and those components of your rainwater storage will be more expensive.

Smaller tanks and bladders can be found in the $150-to-$300 range for something equivalent to a barrel meant for longer storage. But larger and more permanent solutions will run in excess of $1,300, depending on size and whether you need to connect pumps and other plumbing-type accessories.

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Are Rainwater Harvesting Systems Worth It?

After looking at the costs associated with rainwater collection and storage, it’s up to each individual to determine what best fits their situation. For many, it presents a viable option. Whether you’re looking to harvest rainwater for a home improvement or gardening project, remove yourself from the local water supply or anything in between, there are plenty of cost-effective options.