Quick Answer
You likely need a permit for water storage if you're storing more than 100 gallons of water on your property, but regulations vary greatly by state and locality, so it's essential to check with your local government.
Local Regulations and Exemptions
In the United States, water storage permits are typically required for rainwater harvesting systems that hold more than 110 gallons of water in a single tank. Some states, like Arizona and Nevada, exempt small-scale rainwater harvesting systems, while others, like California, require permits for any system larger than 200 gallons. It’s crucial to check with your local government to determine if a permit is needed for your specific situation.
Tank Size and Capacity
When storing more than 100 gallons of water, you’ll need to consider the size and capacity of your tank. A 500-gallon tank, for example, would require a permit in many jurisdictions. In addition to tank size, you’ll also need to consider the roof catchment area, which should be at least 1,000 square feet for a 500-gallon tank. Using a 4:1 ratio is a general rule of thumb for determining the minimum roof catchment area needed.
Permit Process and Fees
The permit process typically involves submitting plans and specifications for your water storage system to your local government or water district. Fees for permits vary widely, but you can expect to pay anywhere from $50 to $500 or more, depending on the size and complexity of your system. In some cases, you may need to hire a professional to design and install your system, which can add to the overall cost.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.