Riparian Ownership Explained: What It Means to Own a Watercourse in England

A recent Daily Mail article highlighted the case of a 76-year-old homeowner in St Neots who, nine years after buying his property, was told by Cambridgeshire County Council that he and his neighbours were responsible, under centuries-old “riparian law”, for maintaining the brook running near their homes, potentially at a five-figure cost. The story struck a nerve with many readers, and unsurprisingly so. Most people have never heard the term “riparian owner”, let alone realised they might be one.

With that in mind, we wanted to set out the basics of riparian ownership in England: what it is, what your rights and responsibilities are, and where to go for further help. This is a general guide only and is not legal advice. If you think you may be a riparian owner and are unsure of your position, please seek qualified legal advice and contact the relevant authority for your watercourse.

What is a riparian owner?

A riparian owner is someone who owns land that has a watercourse running through it, beneath it, or along its boundary. A watercourse can be a river, stream, brook, beck, ditch, culvert (an underground pipe or channel), or any other defined channel through which water flows, including ones that are dry for parts of the year.

If a watercourse forms the boundary of your land, you are usually presumed to own it up to the centre line, unless your title deeds say otherwise. Importantly, the visible boundary on the ground (a hedge, fence or earth bank) is not necessarily the legal boundary, so your deeds (which you can check with the Land Registry) are the place to start.

Watercourses in England fall into two categories:

• Main rivers, which are designated on the Environment Agency’s Main River Map. The Environment Agency has permissive powers to carry out maintenance and improvement work on these to manage flood risk, but is not legally obliged to do so.
• Ordinary watercourses, which are everything else: smaller streams, ditches, culverts, drains and the like. These fall under the remit of the Lead Local Flood Authority (your unitary or county council) or, in some areas, an Internal Drainage Board.

Your rights as a riparian owner

Riparian ownership comes with a set of common law rights, all of which are subject to legal and environmental requirements. In broad terms, you have the right to:

• Receive water in its natural state, undiminished in flow, quantity and quality.
• Protect your property from flooding and your land from erosion, provided your actions don’t increase flood risk or erosion for anyone else.
• Fish in your watercourse (subject to your deeds and a valid rod licence from the Environment Agency).
• Abstract up to 20 cubic metres (20,000 litres) of water per day for ordinary purposes such as watering livestock; larger volumes generally need an abstraction licence.
• Use the water for normal domestic and agricultural purposes, and for other uses such as milling or irrigation, provided you don’t affect other riparian owners or cause pollution.

Your responsibilities

This is the part that catches many homeowners by surprise. As a riparian owner you are expected to:

• Allow water to flow naturally through your stretch of watercourse, without obstruction.
• Maintain the bed and banks, including clearing blockages, fallen branches and litter that could impede flow or cause flooding.
• Keep any structures you own (culverts, weirs, trash screens, mill gates, access bridges) clear of debris and in safe condition.
• Avoid causing pollution. No garden waste, chemicals or wastewater on the banks or in the channel.
• Protect wildlife, including not disturbing nesting birds, fish spawning grounds, or protected species and habitats.
• Control invasive non-native species such as Japanese knotweed, Himalayan balsam and giant hogweed, and prevent them spreading.

If a lack of maintenance, or works that you’ve carried out, causes or contributes to flooding elsewhere, you can be liable for damages and may face enforcement action. Equally, you are not expected to proactively reduce flood risk beyond keeping things flowing naturally; the duty is one of reasonable maintenance, not active flood defence.

Do you need permission to do work on a watercourse?

In many cases, yes. Before undertaking any works in, over, under or near a watercourse, including building, altering or removing culverts, weirs, dams, bridges or banks, you should check whether you need:

• An environmental permit (formerly known as flood defence consent) from the Environment Agency for works on or within 8 metres of a main river (16 metres if tidal).
• Land drainage consent (also called ordinary watercourse consent) from your Lead Local Flood Authority or Internal Drainage Board for works on ordinary watercourses.
• Other permissions such as planning consent, abstraction or impoundment licences, or approvals from Natural England where protected species or habitats are involved.

Some activities are exempt, but exemptions usually still need to be registered with the Environment Agency, and you remain responsible for complying with all other legislation (wildlife protection in particular). Our team regularly supports landowners with this process through our Environmental Permits consultancy.

Where to get help

If you’re unsure about your status, your responsibilities, or proposed works, the best first steps are:

• Check your title deeds via the Land Registry.
• Use the Environment Agency’s main river map to see whether your watercourse is classified as a main river.
• Contact the relevant authority. The Environment Agency for main rivers (general enquiries 03708 506 506), or your Lead Local Flood Authority or Internal Drainage Board for ordinary watercourses.
• For flooding incidents, blockages or pollution, call the Environment Agency’s 24-hour incident hotline on 0800 80 70 60.
• For more general guidance, the GOV.UK page on owning a watercourse and the Environment Agency’s Your watercourse: rights and roles guide are excellent starting points, as is The Flood Hub’s Riparian Owner Toolkit.

We also work with clients on more catchment-scale solutions where appropriate. Our Natural Flood Management case study in Leicestershire shows how watercourse-based interventions can reduce flood risk in practice, and our blog on The Role of a Flood Risk Consultant in Planning and Design gives a broader picture of where consultancy fits into the wider planning and flood risk landscape.

A final word

The St Neots case is a useful reminder that riparian responsibilities are real, long-standing, and can attach to ordinary suburban properties as easily as to rural land, often without owners realising it when they buy. While the rules can feel daunting, they exist for good reason. Well-maintained watercourses reduce flood risk, support wildlife, and protect neighbouring properties.

If you think you might be affected and want a clearer picture of what’s involved, get in touch with our team. And as noted above, please do seek qualified legal advice on anything specific to your circumstances.