In Washington state, rainwater harvesting is legal and even encouraged - counties are authorized to reduce rates for stormwater control facilities that utilize rainwater harvesting by 10% or more.

Nevada used to prohibit rainwater collection, but a 2017 bill now permits it for non-potable domestic use, and allows remote guzzlers for wildlife to hold up to 20,000 gallons.

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New Hampshire places no restrictions or regulations on rainwater harvesting, actively encouraging residents to collect rainwater.

Texas exempts rainwater harvesting equipment from sales and property taxes, and some municipalities offer additional rebates for rainwater collection systems.

In California, the Rainwater Capture Act of 2012 legalized rooftop rainwater harvesting without requiring a permit.

Colorado allows up to 110 gallons of rainwater collection, but it cannot be used for drinking or any indoor use.

Utah residents can legally collect rainwater in up to 2 rain barrels with a total capacity of 100 gallons or less without a permit.

Arizona permits rainwater harvesting, but some municipalities may have additional regulations on the practice.

Florida encourages rainwater harvesting and even offers tax credits for the installation of rainwater collection systems.

Montana has no state-level restrictions on rainwater collection, leaving it up to individual counties and municipalities to regulate the practice.

Oregon allows rainwater harvesting for outdoor use only, and requires a permit for any indoor use of collected rainwater.

Georgia has no statewide laws prohibiting rainwater harvesting, though some local jurisdictions may have their own regulations.

Indiana does not prohibit rainwater harvesting, but there are no state-level incentives or programs to promote the practice.

New Mexico allows rainwater collection without a permit, as long as it is used for domestic, livestock, or commercial purposes.

Virginia has no state law restricting rainwater harvesting, but some localities may have their own regulations.