Why Collect Rainwater?

Collecting rainwater is a smart way to cut utility costs, conserve resources, and stay prepared for dry spells.
Whether you want to water a garden, provide drinking water for livestock, or supplement off-grid living, a rainwater system can help you become more self-sufficient.

However, laws on rainwater harvesting vary by state and even by county. Before setting up barrels or tanks, it’s important to understand local regulations and design a system that meets legal and health standards.

1. Check Local Rainwater Laws First

Rainwater harvesting is legal in most of the U.S., but rules differ:

Some states encourage it with rebates or tax credits (e.g., Arizona, Texas).
Others set limits on how much water you can collect or require permits.
A few have strict guidelines about using collected water for drinking vs. irrigation.

How to Find Your State’s Rules

Visit your state’s Department of Natural Resources or Water Resources website.
Check county or city ordinances for permit requirements.
Ask local extension offices—they often provide quick answers and printed guides.

Pro tip: Print or save a copy of relevant guidelines so you can reference them if you’re applying for rebates or inspections.

2. Choose a Legal Rainwater Collection System

Once you know the rules, plan a setup that meets both legal and practical needs.

Common System Types

Rain Barrels (50–100 gallons): Simple and great for garden watering.
Cisterns or Large Tanks (100–5,000 gallons): Best for livestock, household use, or off-grid living.
Underground Storage: Keeps water cool and reduces algae growth.

Most systems start with gutters and downspouts that direct roof runoff into a barrel or tank fitted with a screened inlet to keep out leaves and insects.

3. Install Filtration and Overflow

Clean water storage starts at the top.

Add a leaf guard or first-flush diverter to remove debris and the initial “dirty” runoff.
Make sure tanks have an overflow outlet to divert excess water safely away from foundations.
Keep lids tight and sealed to prevent mosquito breeding.

4. Store Water Safely

Proper storage keeps your water usable and safe.

Use food-grade or potable-water barrels if you plan to drink or cook with the water.
Keep containers in a shaded area to slow algae growth.
Clean barrels annually with a mild bleach solution and rinse thoroughly.
If the water is for indoor or drinking use, install a secondary filtration or UV purification system.

5. Use Rainwater Wisely

Rainwater is ideal for many everyday needs:

Gardens and lawns: Reduces municipal water usage.
Livestock and pets: Safe when stored in clean, food-grade containers.
Household use: Washing, flushing toilets, or even drinking (where permitted and properly filtered).

Label containers clearly if different tanks are intended for different uses (e.g., “irrigation only”).

Final Thoughts

Collecting rainwater can save money, reduce strain on municipal systems, and keep your property greener during dry spells.
By checking your state’s regulations, setting up a clean collection system, and storing water safely, you can create a sustainable supply that meets legal requirements and supports your outdoor lifestyle.

How to Collect and Store Rainwater Legally