Nowhere in the United States is it flatly illegal to collect rainwater for personal use. All states allow homeowners to collect rain water in barrels or cisterns for use in their landscape. The changes from state to state is not whether or not collection is legal, but how much water a household can store and if there is a permit for larger systems. There are only small-scale statewide restrictions in Colorado, Utah, and Nevada.
Key Takeaways
- It is legal to collect rainwater in all 50 states. There is no state that has a complete ban on the practice.
- Only Colorado and Utah have definite statewide gallon caps (110 gallons and 2,500 gallons).
- Nevada is the most restrictive state because a waiver from the State Engineer is required prior to any collection.
- Residential rainwater collection is allowed without restriction in California, Texas, Florida, Ohio, Indiana, Tennessee, Virginia, Arizona and Michigan.
- The local city ordinance, HOA rules, and building permits have a greater chance of restricting a system than the state law.
Why Rainwater Laws Differ From State to State
The difference can be attributed to two conflicting legal traditions. Most of the eastern and midwestern states have riparian water law, which recognizes as a fundamental property right the reasonable use of water by the landowner for his own use. In contrast, western states typically adhere to the doctrine of prior appropriation, as stated in the “first in time, first in right” principle, which means that any water use recorded earlier on a stream system is entitled to priority over later water uses even if the water has not reached the stream.
Under the Colorado State “first in time, first in right” doctrine, the state’s waterways are over-appropriated, and rainwater collection in Colorado can be limited without a water plan. The Division of Water Resources of the state of Colorado says that the collected rainwater can normally be used only for outdoor purposes (for example, to irrigate lawns and gardens on the same land on which it is collected) and not for indoor or drinking purposes.
The same logic is not valid east of the Rocky Mountains, where most states have never considered rainfall as an allocated resource. Colorado’s experience with rain barrels is more complex because states that follow the older prior appropriation logic have had to enact legislation to allow for the collection of rainwater for households.
Can you collect rainwater in any state?
No. By 2026, 50 states have some form of residential rainwater harvesting. A 50-state legal tracker by rainwater policy researchers indicates that about 38 states have no restrictions on residential collection at all. Except for the three states, Colorado, Utah and Nevada, which impose a limitation on volume or registration, the activity is not prohibited.
| State | State-Level Restriction | Notes |
| Colorado | 110-gallon cap | Two standard rain barrels maximum under HB 16-1005 |
| Utah | 2,500-gallon cap | Registration required for systems over 100 gallons |
| Nevada | Waiver required | State Engineer approval needed before any collection |
| All other states | None or minimal | Local permits may apply to large cisterns |
State-by-State Rules for Common Search States
California
There are no state limits on residential rainwater collection in California and it is encouraged. The 2018 legislation (SB-558) established a property tax exemption for new residential rainwater collection systems and placed no limit on the amount of water that can be stored in a home. For local incentives and permit information, read our comprehensive California Rainwater Collection Guide.
Texas
Texas is one of the states that is the most water-friendly in the country. There are no state restrictions on simple systems like rain barrels, and Texas Local Government Code promotes rebates and discounts on storage equipment by counties and cities. Local governments are not allowed to refuse a building permit based on the presence of a rainwater harvesting system and the equipment used to harvest rainwater is exempt from state sales tax. House Bill 3391 contains separate quality standards regarding systems designed to provide drinking water for indoor use. Full details are in our Texas rainwater collection guide.
Florida
There are no statewide limits on residential collection in Florida. A few counties have rain barrel or cistern rebate programs, including the areas surrounding Tampa Bay. Read our Florida Rainwater Collection Guide for County Programs.
Ohio
There is no state law in Ohio that limits the use of residential rainwater harvesting. Non-potable catchment systems for irrigation and outdoor use are generally allowed and larger systems are covered by regular local plumbing and building codes, not specific state rainwater laws. For more information, check out our Ohio Rainwater Collection Guide.
Indiana
Rain water harvesting for personal use is not limited in Indiana. The 2020 Indiana Residential Code covers non-potable catchment and distribution systems in homes, suggesting that the state does not have a dedicated rainwater statute, but instead includes these systems in its building code. Rebates are available in some counties, such as Elkhart County, for rain barrel installations.
Tennessee
The state of Tennessee has no limits or permit requirements for the collection of rainwater. Rainwater harvesting is listed as a stormwater management technique in state legislation that supports green infrastructure, and there are rainwater harvesting education and rebate programs in cities like Chattanooga and Nashville.
Virginia
There are no restrictions on rainwater collection in Virginia and a tax deduction is available for rainwater harvesting equipment. The State recognizes rainwater harvesting as an acceptable stormwater management practice.
Arizona
In an effort to promote the use of water that would otherwise go to waste, the State of Arizona actively encourages rainwater harvesting, even in their arid climate, and provides a state income tax credit for rainwater harvesting systems up to $1,000. Residential collection does not have a volume limit.
Michigan
There are no restrictions on rainwater collection in Michigan. In Michigan, which is a riparian rights state and has significant water resources, residential harvesting is not a regulated activity, but an environmentally beneficial activity.
What really restricts a rainwater system?
In almost all of the nine states listed above, it’s not the state law that’s the problem. The practical limits are due to three other sources.
- Local building codes. Where the state does not limit the size of cisterns, the building permit is usually required for cisterns larger than 500 to 1,000 gallons.
- HOA covenants. Aesthetic concerns are a reason some homeowner associations limit the use of rain barrels that are visible from the street. In Texas and in a few other states, there are laws that prohibit HOAs from outright prohibiting collection systems.
- Health codes and mosquito codes. To keep standing water from becoming a breeding ground for mosquitoes, most states and counties require that any water storage container with an opening has a sealable lid.
Most of these obstacles will not be encountered by a homeowner who is looking to install a small rain barrel under a downspout. Whether a homeowner lives in one of the nine states listed above, they should consult with their local building department before installing a 2,000-gallon underground cistern for whole-house irrigation.
Also Read: Is It Illegal To
Conclusion
Collecting rainwater is widely believed to be illegal in the United States. In reality, all states allow it and the vast majority of states, such as California, Texas, Florida, Ohio, Indiana, Tennessee, Virginia, Arizona, and Michigan, don’t even have a volume cap for residential systems. The exceptions that exist are as a result of water rights law, not a blanket ban, and Colorado, Utah and Nevada are included and permit some collection. Even if a large cistern installation is not prohibited by state law, it is still prudent to check local building codes and homeowners association rules before installing it anywhere in the country, as these are more likely to impact a project than state law. To learn more about the treatment of rainwater in a particular state, please read the detailed state guides linked throughout this article.
To check out the national legislation regarding rainwater collection, go to Is It Illegal to Collect Rainwater?
Frequently Asked Questions
1. Is there any law prohibiting rainwater collection in the United States?
Yes, rainwater collection is legal in all 50 states in 2026. A few states, primarily Colorado, Utah and Nevada, have volume caps or permit requirements, but none that ban the practice.
2. Which state has the strictest rainwater collection laws?
Nevada is the most restrictive state, as no collections are allowed without a waiver from the State Engineer, which is linked to the state’s water rights system of first in time, first in right.
3. In California, can I collect rainwater without obtaining a permit?
Yes. There is no state-wide volume cap or permit limit for rainwater collection at the residence level and there is a property tax exemption for new systems installed under SB-558.
4. Do I need a permit to collect rainwater in Texas?
Not a typical rain barrel or small cistern. Only if the system is used for potable water for drinking, cooking or bathing do Texas has additional water quality standards.
5. Is it legal to collect rainwater in Arizona in such a dry climate?
Yes. One of the most incentivized states in the country, Arizona has no volume restrictions and provides a state income tax credit of up to $1,000 for qualifying rainwater harvesting systems.
6. How is it that rainwater can be collected in Colorado but not in Ohio or Virginia?
It’s all about the doctrine of water rights. Colorado is a “first in time” state, and water rights for downstream users are legal rights to runoff. In Ohio and Virginia, riparian rights principles allow for reasonable use of rainfall on one’s own land to be unlimited.
