Inside the system where a dirty river is worth more than a clean one
In March 2026, a barrister named Paul Powlesland and a group of volunteers pulled over 200 bags of rubbish out of the River Roding in East London. Syringes. Weapons. Domestic appliances. They hired a digger for £1,000 of their own money and cleared 250 metres of choked waterway. Within days — before Powlesland had even posted about the work publicly — the Environment Agency was investigating him. The offence carries up to two years in prison. A few hundred metres upstream, a Thames Water outfall pumps 750 million litres of raw sewage into the same river. That is not under investigation.
Powlesland lives on a houseboat on the Roding. He runs the River Roding Trust, a grassroots charity. The volunteers removed rubbish, cleared invasive Himalayan Balsam, and let light back to the water. The results were immediate: irises and reed beds returned, fish appeared for the first time, dragonflies and herons came back. "The whole ecosystem is coming back to life," he said.
He suspects the Environment Agency had someone monitoring his private Facebook group. "I hadn't even posted about the works publicly. So it seems like there's EA spies in our Facebook group, spying on local people restoring a river. I don't see how else they would have known."
The EA's position is that he operated without a permit. You need a licence to alter a watercourse — even to clean one. The framework exists to prevent unauthorised interference that might damage riverbanks or habitats. Reasonable enough in principle. But here's the thing.
Thames Water's response to journalists was a masterpiece of bureaucratic calm: the outfalls "operate within limits set by the Environment Agency and are a legally permitted process of the wastewater system." The sewage, they explained, is "heavily diluted by rainwater." The system was "originally designed this way." They are, in other words, legally filling the river with sewage. Powlesland is illegally cleaning it.
The River Roding Trust — Powlesland's charity — is listed on the Environment Agency's own Catchment Data Explorer as a Catchment Partnership contributor. The same website celebrates "rubbish clearance" and "clearing of invasive Himalayan Balsam" along the River Roding as partnership success highlights. The EA's partnership arm celebrates the work. The EA's enforcement arm prosecutes it.
"This river will be restored — they now have a clear choice."
— Paul Powlesland
This is where it gets structural. To understand why the system responds faster to a man with a bin bag than to a company with a sewage pipe, you need to understand three things that didn't exist ten years ago.
Biodiversity Net Gain (BNG) — Since February 2024, every new development in England must leave habitats 10% better than before. If a developer can't deliver this on-site, they buy "Biodiversity Units" from landowners elsewhere. Average price: around £30,000 per unit. Rivers and waterways generate units too — the worse the baseline condition, the more units a future restoration project can generate.
Nutrient Credits — In 27 river catchments across England, new developments must achieve "nutrient neutrality" — they can't add nutrients to already-polluted waterways. Developers achieve this by buying credits from landowners who reduce nutrient run-off. One credit = 1 kg of nitrogen or phosphate offset. Price: £2,000–£5,000 per credit. Natural England launched its own nutrient mitigation scheme in 2023 and administers the market.
Stacking — The same piece of land, or the same stretch of river, can generate BNG units AND nutrient credits AND carbon credits simultaneously. Natural England recommends this. It's called "stacking." One restoration project, three revenue streams, all registered, all tradeable.
Now here's the rule that locks it together: additionality. You cannot get credits for work that's already been done. A clean river can technically enter a credit scheme — but it generates almost nothing, because there's no gap left to sell. All units must result from a measurable gain from an original baseline. The dirtier the baseline, the bigger the gain, the more credits the restoration generates. The system doesn't ban clean rivers. It makes them financially worthless.
A volunteer who cleans a river without a permit doesn't just fail to generate credits.
He destroys the baseline that makes the credits valuable.
Powlesland improved 250 metres of the Aldersbrook channel for free. In doing so, he raised the baseline. If that stretch is ever enrolled in a BNG or nutrient credit scheme, the improvement he delivered — the irises, the fish, the herons — is already there. It can't be counted as a gain. It can't be sold. In market terms, he burned value. He made the river better in a way the system can't monetise.
The Environment Agency regulates what you can do to a river. It also administers the catchment partnership framework that identifies which rivers need restoration. It also sets the conditions under which river restoration generates tradeable credits. It also monitors compliance with those credits over their 20-to-30-year lifespan.
Natural England — the EA's sister quango under DEFRA — runs the Biodiversity Gain Sites Register and the nutrient mitigation scheme. It recommends stacking. It sets the metric that calculates unit values. It advises on baselines.
The regulator, the market-maker, and the enforcer are the same family of institutions. They set the conditions that keep rivers dirty ("funding sources need identifying," says the EA's own catchment plan). They administer the market that monetises the eventual cleanup. And they prosecute anyone who does the cleanup outside the system.
The River Roding, in Barking and Ilford, sits inside the boundary of a Special Economic Zone — one of 48 SEZs mapped across England, each with a 45km-diameter buffer. These are zones with tax breaks, relaxed planning rules, and reduced regulation, designed to accelerate development. Every new development inside an SEZ boundary that triggers BNG requirements needs biodiversity units. Every development near a nutrient-sensitive waterway needs nutrient credits.
The river that Powlesland cleaned flows through a zone where development is being actively accelerated. That development generates demand for credits. The credits require dirty baselines to be valuable. The baselines require the river to stay dirty until someone restores it inside the system, with permits, with registered credits, with 30-year conservation covenants.
Powlesland, with his bin bags and his hired digger, is not a threat to the river. He's a threat to the pipeline.
The EA's catchment plan for the Roding, Beam & Ingrebourne sets a target: achieve Good Ecological Potential by 2027. That's next year. The plan lists a dozen priority restoration measures. Most are flagged "less certain" with the same note: "funding sources need identifying."
The funding mechanism exists. It's called the credit market. But the credit market needs permits, baselines, registered schemes, and conservation covenants. It needs the work to happen inside the system. A man who scales a razor-wire fence with a wood saw and a group of volunteers and makes the river come back to life — for free, without permission, because he lives on it and can see it dying — is doing the right thing in a way the system cannot recognise, reward, or allow.
So the system sends a letter. The letter threatens two years in prison. The river, for a few hundred metres at least, has fish in it again. The sewage outfall upstream continues to operate within its legally permitted limits.
Everything is working exactly as designed.