An $80 Rain Barrel Pays for Itself in 6.7 Months
Watering your garden with the hose costs roughly $12/month during the growing season — and every drop goes through your water and sewer meter. A rain barrel collects what the sky gives you for free. At $144/year in savings, the payoff math is almost comically quick.
Payoff Time
6.7 mo
Rain Barrel vs Municipal Water for Garden
Product cost
$80
one-time
Annual savings
$144
vs Municipal Water for Garden
Best Payoff
Rain Barrel
The Setup: Your Downspout Is a Money Faucet
Here's something most homeowners never think about: when you water your garden with a hose, you're paying twice. Once for the water coming out of the tap, and again for the sewer fee — because your utility assumes all metered water eventually goes down a drain. Your tomatoes don't care about that distinction, but your water bill does.
The average US household uses roughly 1,000 gallons per month on outdoor irrigation during the growing season (about 6 months, give or take depending on your climate). At a combined water-and-sewer rate of about $0.02 per gallon, that's around $20/month flowing straight onto your lawn and garden beds. A single rain barrel won't replace all of that — but it can conservatively offset about 600 gallons per month, which knocks roughly $12/month off your bill during active watering months.
The Math
A solid rain barrel costs about $80. It has no electricity costs, no filters to replace, no subscription fees — just gravity and rain. During the growing season, you save approximately $12/month by using collected rainwater instead of the hose. That means payoff arrives in just 6.7 months of active use — potentially within a single growing season if you start early enough in spring.
After that, it's pure savings: roughly $144 per year, every year, for as long as the barrel holds water and the sky keeps doing its thing. Over a 10-year lifespan (and many rain barrels last far longer), that's over $1,300 back in your pocket from an $80 purchase. Not bad for a plastic barrel that just sits there.
| Rain Barrel | Municipal Water for Garden | |
|---|---|---|
| Upfront cost | $80 | $0 |
| Monthly ongoing | $0 | $12 |
| Month 1 total | $80 | $12 |
| Month 2 total | $80 | $24 |
| Month 3 total | $80 | $36 |
| Month 4 total | $80 | $48 |
| Year 1 total | $80 | $144 |
| Year 3 total | $80 | $432 |
| 5-year total | $80 | $720 |
* All figures are estimates. See methodology for assumptions.
Cumulative Cost Over Time
The lines cross at the breakeven point — that's when the savings zone begins.
When a Rain Barrel Doesn't Pay Off
Let's be honest: this math depends heavily on where you live. If you're in an arid climate where it barely rains during the growing season — looking at you, Phoenix — a 50-gallon barrel isn't going to fill itself often enough to offset much. The savings assume reasonably regular rainfall, which works great in the Southeast, Midwest, and Pacific Northwest, but gets shakier in the desert Southwest.
Also, if your outdoor watering usage is already low — maybe you've got a small patio garden or you're mostly growing drought-tolerant natives — you might only save $3–5 per month, which stretches the payoff to well over a year. Still positive ROI eventually, but less of a slam dunk.
Finally, some municipalities and HOAs have restrictions on rainwater collection (yes, really). Most states allow it, but a few require permits or limit barrel size. Check your local rules before you buy — a rain barrel that sits in your garage because of a code violation has an infinite payoff period.
Sensitivity Analysis: Your Results May Vary
Payoff time changes based on how much you currently spend.
Heavy use (large garden, rainy climate)
You use 1,000+ gallons/month via multiple fills or linked barrels, saving $20/month during the growing season.
4mo
$240/yr
Moderate use (typical garden, regular rain) (our base case)
You offset about 600 gallons/month with rainwater, saving $12/month during the growing season.
6.7mo
$144/yr
Light use (small garden, dry climate)
You use about 350 gallons/month of collected rainwater, saving $7/month during the growing season.
11.4mo
$84/yr
"An $80 rain barrel saves $144/year on outdoor watering and pays for itself in a single growing season."
What We Recommend
We picked three rain barrels at different price points, all assuming the same payoff math: you'll use collected rainwater to offset roughly 600 gallons/month of municipal water during the growing season, saving about $12/month. The cheaper the barrel, the faster the payoff — but durability and features vary.
53 Gallon Collapsible Rain Barrel, SKM Portable Rain Water Collection Barrel for Garden/Outside/Lawn, PVC Rainwater Collection System Water Tank Storage Container with Spigots & Overflow Kit, Black
$37
upfront
3.1mo
payoff
$144
/ year
The collapsible design is clever — it folds flat for off-season storage, which is great if you're short on space. At $37, it pays for itself in just over 3 months of watering season use. The trade-off is durability: PVC fabric won't last as long as rigid plastic, and the collapsible walls can sag when full. But for the price, it's a low-risk way to test whether rain barrel life is for you.
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RTS Home Accents 50-Gallon ECO Rain Barrel Made with 100% Recycled Plastic, Flat Back Rain Water Collection Barrel, Black
$80
upfront
6.7mo
payoff
$144
/ year
This is the one we built the math around, and for good reason. The RTS ECO barrel is made from 100% recycled plastic, has a flat back that sits flush against your house, and includes a spigot and overflow hose connection out of the box. At $80, it hits the 6.7-month payoff window and should easily last a decade or more. It's the sweet spot of price, durability, and set-it-and-forget-it simplicity.
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RTS Home Accents 50-Gallon ECO Rain Barrel Made with 100% Recycled Plastic, Flat Back Rain Water Collection Barrel, Soaker Hose Included, Black
$128
upfront
10.7mo
payoff
$144
/ year
Same recycled-plastic RTS barrel, but bundled with a soaker hose — which is a genuinely useful add-on. Connect it directly to the spigot and let gravity slowly water your beds without any effort. At $130 the payoff stretches to about 10.8 months, but you're getting a more complete irrigation setup right out of the box. Worth it if you want the laziest possible garden watering system.
Check current price →Price shown is approximate. Click for current price. Affiliate link.
What we didn't account for
- → Rainfall varies wildly by region Our math assumes enough regular rainfall to fill a 50-gallon barrel multiple times per month. In drier climates or during drought years, actual savings could be significantly lower.
- → Water rates differ by municipality We used a national average of ~$0.02/gallon (water + sewer combined). Your local rate could be half that or double — check your bill to see your actual per-gallon cost.
- → Installation isn't always free Most rain barrels need a downspout diverter kit and a level surface to sit on. If you need to buy a diverter ($10–$25) or build a platform, add that to the upfront cost.
- → One barrel has its limits A single 50-gallon barrel can run dry between rainstorms, especially in peak summer. Power gardeners may need two barrels linked together to hit the 600 gallons/month assumption.
See how Rain Barrel compares to other outdoor products.
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