Is It Illegal to Collect Rainwater? State Rules and Official Sources (2026)

Rainwater collection rules depend on the state, the intended use, and sometimes the building or parcel. A rooftop barrel used outdoors can fall under different rules from an indoor or drinking-water system. Check the water-rights agency, building department, and health authority for your project before installing or connecting a system.

This guide keeps the existing state-by-state directory route, but only gives specific legal limits where we have checked an official source. Other jurisdictions are marked for source review rather than assigned an unsupported legal category or rebate amount. Puerto Rico is a U.S. territory and appears separately from the 50 states.

Verified examples from official sources

Jurisdiction	What the official source says	Source and directory
Colorado	For a qualifying single-family residence or a residence with four or fewer units, up to two rain barrels may hold 110 gallons combined. Collect from a residential roof and use the water outdoors on the same property. Eligible properties with residential wells have a separate permit pathway that may allow more collection and different uses.	Colorado Division of Water Resources · Colorado directory
Utah	Without registration, use no more than two covered containers, each with a maximum capacity of 100 gallons. With free registration, total storage may be up to 2,500 gallons. Collection and use must occur on the same parcel.	Utah Division of Water Rights · Utah directory
Texas	Qualifying rainwater-harvesting equipment and supplies can be exempt from sales tax. Property Code § 202.007 limits certain property-association restrictions while allowing specified controls on visible systems. Health & Safety Code § 341.042 addresses treatment, cross-connection protection, and qualified installation for relevant systems. Local rules may add requirements.	Texas Water Development Board · Texas directory
Puerto Rico	Ley Núm. 91-2024 promotes rainwater harvesting and directs agencies to implement projects in government buildings. It does not itself create a general residential permit exemption. It advises against drinking, animal consumption, personal hygiene, laundry, household cleaning, and primary-contact uses unless the Department of Health evaluates an appropriate system and determines the water is safe.	Official Ley Núm. 91-2024 · Puerto Rico directory

Colorado: residential barrels and the separate well pathway

House Bill 16-1005 established the two-barrel, 110-gallon combined-capacity residential provision. Colorado’s current agency guidance says the barrels can be filled and refilled through the year, need sealable lids, and the collected water is for outdoor use on the property. Do not treat 110 gallons as a universal cap: the agency describes another permit route for eligible properties with residential wells. The well permit determines allowed uses.

Utah: container size is per container

The Utah registration page specifies no more than two covered containers without registration, neither larger than 100 gallons. The registered limit is 2,500 gallons total, registration is free, and the water must be captured and used on the same parcel. The earlier wording that limited unregistered storage to 100 gallons total was incorrect.

Texas: exemptions and restrictions have conditions

The Texas Water Development Board points readers to the relevant state provisions. Tax Code § 151.355 concerns qualifying equipment and supplies, not an unconditional exemption for every purchase. Property Code § 202.007 restricts some association prohibitions but permits specified rules about visible systems. Health & Safety Code § 341.042 provides safeguards for relevant public-water connections and potable systems. Ask the local authority about the proposed design and permits. Browse the Texas directory or Austin installer listings while checking each contractor’s source status.

Puerto Rico: what Ley 91-2024 establishes

Ley Núm. 91-2024 establishes public policy to promote rainwater harvesting. It assigns government implementation duties; it does not itself grant a general residential permit exemption or rebate. For the listed health-related uses, it calls for an appropriate system and Department of Health evaluation. The Puerto Rico directory offers local listing and source-review status.

Other state directories: legal source review pending

The following links help you find regional listings and any attached official source. They do not establish a statewide legal status, capacity limit, permit exemption, or current incentive. Check state and local authorities for those claims.

• Arizona Directory
• California Directory
• Connecticut Directory
• Florida Directory
• Georgia Directory
• Hawaii Directory
• Illinois Directory
• Iowa Directory
• Kansas Directory
• Kentucky Directory
• Maine Directory
• Maryland Directory
• Massachusetts Directory
• Michigan Directory
• Missouri Directory
• Montana Directory
• New Mexico Directory
• New York Directory
• North Carolina Directory
• Ohio Directory
• Oklahoma Directory
• Oregon Directory
• Pennsylvania Directory
• Tennessee Directory
• Virginia Directory
• Washington Directory
• Wisconsin Directory

Frequently asked questions

Can I drink collected rainwater?

Do not assume a barrel’s water is safe to drink. Treatment and approval depend on the source, system, and local health rules. See our drinking-water guide for a planning overview and ask the relevant health authority before using roof runoff as drinking water.

Can a homeowners association restrict a rain barrel?

The answer depends on the jurisdiction and the association’s governing documents. For example, Colorado HB16-1005 includes protection with stated exceptions and allows reasonable appearance rules. Texas Property Code § 202.007 also has qualifications. Check the law and documents that apply to your property.

Do I need a permit?

Rules vary with container size, indoor plumbing, use, and location. Colorado’s qualifying two-barrel provision does not require DWR approval, while its separate residential-well pathway does. Utah’s unregistered container allowance differs from its registered storage tier. Ask your local building and water authorities about your specific system.

Plan a system and find a provider

Use the national installer directory to browse listings and evidence status, or estimate capacity with the rainwater collection calculator. These tools do not replace a current permit or water-quality determination.

This educational guide is not legal or engineering advice. Official rules and local requirements can change; confirm them with the responsible authority before acting.