Rainwater collection is legal in all 50 states

Where the myth comes from

The myth originated from older western water law — specifically, the prior appropriation doctrine in states like Colorado, where water rights are allocated by the state and "first in time, first in right." Under this system, historically, even rainfall that landed on your property was considered part of the allocated water supply once it entered a waterway. Collecting it before it reached the stream could, in theory, infringe on downstream water rights.

Colorado updated its law in 2016 to explicitly permit residential rainwater harvesting up to 110 gallons. The prior appropriation concern — never a practical enforcement issue for a household rain barrel — is now a settled legal matter. Every state has either never restricted residential rainwater collection or has since clarified that small-scale residential collection is permitted.

The three states with restrictions

What the other 47 states look like

Unrestricted. No permit, no registration, no volume cap. Many states actively encourage rainwater harvesting through rebate programs offered by water utilities. Texas, North Carolina, Virginia, and Florida are among the states with the most active utility rebate programs — in some cases, a rain barrel costs nothing out of pocket after rebate.

Check your local water utility's website before purchasing. A rebate may be available for your specific purchase. Search "[your city or county] rain barrel rebate" — the programs are genuinely common and underused.

What a basic rain barrel setup looks like

A standard residential rain barrel setup connects to an existing downspout. The barrel — typically 50 to 55 gallons — installs beneath the downspout with a diverter that routes water into the barrel and automatically diverts overflow once the barrel is full. Total cost for a complete setup runs $60 to $200 depending on the barrel quality and whether a diverter is included.

One inch of rain on 1,000 square feet of roof produces roughly 600 gallons of runoff. A single downspout typically drains 300 to 600 square feet. At that yield, a 55-gallon barrel fills completely from a modest rain event — the limiting factor is always barrel capacity, not rainfall frequency in most of the US.

What to do right now

1. 1 Check your utility for a rebate. Before buying anything, search for rain barrel rebates in your area. A $30 to $80 rebate on a $80 to $120 barrel is common.
2. 2 If you are in Colorado, confirm your setup stays under 110 gallons. Two standard 55-gallon barrels is the limit; a single barrel gives you comfortable margin.
3. 3 Install a downspout diverter, not just a shortened downspout. A diverter automatically handles overflow when the barrel fills — preventing flooding at the foundation.
4. 4 Do not use rain barrel water for drinking without treatment. Rooftop collection picks up bird droppings, atmospheric particulates, and roofing material residue. Rain barrel water is appropriate for garden irrigation and outdoor use. Treat through a gravity filter and chemical treatment before drinking in an emergency.
5. 5 Winterize before first frost. Drain the barrel completely, disconnect the diverter, and store the barrel indoors or upside down. Water left in a sealed barrel cracks it when it freezes.