Is it illegal collect rainwater?
No, it is not illegal to collect rainwater in the United Kingdom, and this applies regardless of how the question is phrased. Whether you ask "is it illegal to collect rainwater" or "is it illegal collect rainwater" — the answer remains the same. Rainwater harvesting is a legal, environmentally beneficial practice with no blanket restrictions at the national level.
A Simple Question With a Simple Answer
Some variations of this question include a typo — missing the word "to" — but the intent is clear, and so is the legal position. There is no statute in UK law that makes it a criminal or civil offence to collect rainwater falling on your property. The UK operates under a system where landowners have the right to capture and use rainwater that falls on their land, subject only to limited exceptions related to public health, building safety, and large-scale abstraction.
Why People Think It Might Be Illegal
Despite the legal clarity, the belief that rainwater collection might be illegal persists in certain circles. This is partly due to the spread of misinformation on social media, where dramatic claims about water rights generate engagement. It is also reinforced by the complexity of water legislation in other countries. When people read about disputes over water rights in drought-prone regions, they may worry that similar restrictions apply in the UK. Additionally, some water companies have historically discouraged rainwater harvesting on their properties or for their customers, though this is becoming less common as sustainability goals take priority.
What the Law Actually Says
The key piece of legislation relevant to rainwater harvesting is the Water Act 2003, which updated the earlier Water Resources Act 1991. These laws govern water abstraction — the extraction of water from rivers, lakes, and underground sources — but explicitly exclude rainwater collected from rooftops or other impermeable surfaces. The Environment Agency's guidance on this point is unambiguous: "Rainwater harvesting — collecting rainwater from roofs — does not require an abstraction licence." The Water Supply (Water Fittings) Regulations 1999 and the Building Regulations 2010 (Part G and Part H) set standards for how systems should be installed, particularly if they connect to internal plumbing, but these are safety standards rather than prohibitions.
Encouragement From Government and Industry
Far from being illegal, rainwater harvesting is actively promoted by government bodies, environmental organisations, and the water industry. Ofwat, the water services regulation authority, encourages water efficiency measures including rainwater harvesting. The Environment Agency has published technical guidance on system design and installation. Many water companies offer discounted water butts or rebates for customers who install rainwater harvesting systems. These are not the actions of an industry or government that considers the practice illegal.
Getting Started
If you are considering collecting rainwater, there is no legal barrier to doing so. A simple water butt connected to a downpipe is the most accessible option and can be installed in minutes without any permissions. Larger systems with underground tanks and internal plumbing connections will require compliance with building regulations but remain perfectly legal. The most important step is to ensure your system is designed correctly for your needs and installed safely — but legality is not a concern you need to worry about.