Severn Trent will pay £777,424 over an ammonia breach at Cheltenham's Hayden sewage works. It is not a fine and not a conviction. What the deal covers.
Severn Trent is paying £777,424 to two environmental charities after breaking the terms of its permit at Cheltenham’s Hayden sewage works. The Environment Agency published the settlement on 4 August 2026.
The breach itself was almost five years ago. The company failed to comply with the permitted levels of ammonia in the effluent leaving Cheltenham (Hayden) Wastewater Treatment Works, Hayden Lane, on and before 13 September 2021.
The Cheltenham money splits two ways:
- £450,000 to the Severn Rivers Trust
- £327,424 to Gloucestershire Wildlife Trust
Cheltenham is one of two cases the Environment Agency announced together. The other concerns two unauthorised sewage discharges from Blackminster works near Evesham into Broadway Brook, on 12 June and 20 August 2022, and brings a further £1.5 million to Gloucestershire Wildlife Trust. The two together come to £2,277,424.
This is not a fine, and nobody was convicted
The distinction matters, because the headline figure looks like a court penalty and is not one.
What the Environment Agency accepted here is an Enforcement Undertaking. In its own description, that is “a legally binding voluntary agreement proposed by a business (or an individual) when the EA has reasonable grounds to suspect that an environmental offence has occurred”. It is an alternative to prosecution or a monetary penalty, it is offered by the company rather than imposed, and accepting one is always at the agency’s discretion. The power comes from the Environmental Civil Sanctions (England) Order 2010.
So there was no prosecution and no conviction. The suspected offence in the Cheltenham case is recorded as failure to comply with a permit condition for a water discharge activity, under Regulation 38(2). The case reference is EU1089.
Severn Trent also has to cover the Environment Agency’s costs, and to carry out actions to stop the offending, prevent it happening again and repair any harm done.
The dates are a long way apart
The Cheltenham timeline is worth setting out, because the announcement is much fresher than the case:
- 13 September 2021: the date on and before which the ammonia limits were breached
- 29 May 2025: the Environment Agency accepts the Enforcement Undertaking
- 4 August 2026: the agency publishes the outcome
The Evesham case ran the other way round. Those discharges happened in 2022, later than the Cheltenham breach, but its Enforcement Undertaking was not accepted until 12 February 2026, nearly nine months after Cheltenham’s.
What the money buys
Gloucestershire Wildlife Trust says its share supports the Severn Treescapes project. The trust describes the aim as creating “a 60-mile corridor of enhanced tree cover to connect two of England’s largest semi-natural woodlands crossing Gloucestershire, Herefordshire and Worcestershire”, running from the Lower Wye Valley and Forest of Dean up to the Wyre Forest.
The trust’s reasoning for spending pollution money on trees is that trees filter pollutants before they reach a watercourse, hold riverbanks together, cut soil erosion and slow the flow after heavy rain.
There is a wrinkle in that. Gloucestershire Wildlife Trust’s own page for Severn Treescapes lists Severn Trent as one of the project’s match funders, alongside the three county councils, the Environment Agency and Ourboretum. The company paying the enforcement money was already helping to fund the project receiving it.
The Severn Rivers Trust says its £450,000 will fund “a package of practical river restoration measures across the Severn catchment”, covering habitat restoration, floodplain reconnection, wetland creation and work with landowners to cut diffuse pollution.
Geoff Craig, environment manager at the Environment Agency, said Enforcement Undertakings “allow companies to put right what went wrong and channel money directly into the environment”, and that the money “will be invested back into the local area”.
What the record does not say
Two things are missing from the published account, and we are not going to fill them in.
The Environment Agency names the works and the permit condition, but it does not name the watercourse that received the effluent from Hayden Lane. It does name Broadway Brook for the Evesham case. We could not confirm the Cheltenham receiving water from a first-party source today, so we are not naming one.
Neither does the record say how long the ammonia limits were exceeded, by how much, or what effect it had on fish or invertebrates. The published notice gives the date, the regulation and the sums.
The company with the best rating in the industry
One more piece of context, because it cuts against the obvious reading of this story.
In the Environment Agency’s most recent Environmental Performance Assessment, covering 2024 and published on 23 October 2025, Severn Trent was the only company in England to earn the top four-star rating for industry-leading performance. Across all nine companies the sector scored 19 stars out of a possible 36, down from 25 the year before, the lowest total since the assessment began.
Cheltenham’s supplier is, on the regulator’s own scoring, the best performer in a sector performing badly.
What it means for you
Nothing changes on your bill or at your tap. This is an enforcement matter about treated effluent leaving a works, not about drinking water, and the payments come from the company rather than from any local budget.
If you want to follow it further:
- The case reference is EU1089, and Enforcement Undertakings are published by the Environment Agency on GOV.UK. Searching that reference brings up this case.
- The money is now with the two charities, so their project pages are where the spending will show up, not the council’s.
- Hayden works sits on the western edge of the borough. Development around it goes through the borough council’s register, which we track on our Cheltenham planning news page.
If the Environment Agency publishes the receiving watercourse or any monitoring detail for the Hayden case, we will add it here.
Sources
- Severn Trent pollution incidents end in £2.2m for charities, Environment Agency, 4 August 2026: the payments, the incidents, the dates, case references EU1089 and EU1099, the quotes and the definition of an Enforcement Undertaking.
- Severn Treescapes, Gloucestershire Wildlife Trust: the 60-mile corridor aim, the counties covered and the list of funders.
- Environment Agency continues to call for urgent action as water company performance declines, 23 October 2025: the 2024 Environmental Performance Assessment, Severn Trent’s four-star rating and the 19-star sector total.
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