An investigation by the Environment Agency into Severn Trent Water revealed that raw sewage from a blocked sewer had been discharged into a brook near Gloucester – impacting about 1.7km of the watercourse.

The case has ended in the water company agreeing an Enforcement Undertaking (EU) with the Environment Agency and giving Gloucestershire Wildlife Trust £327,500.

An EU is a voluntary offer made by companies and individuals and can be accepted where the Environment Agency has reason to believe an offence has been committed.

It usually includes a payment to an environmental charity to carry out improvements. The Environment Agency received reports of dead fish on 19 August 2021 at School Lane, Quedgeley, near Gloucester.

An inspection revealed hundreds of dead sticklebacks and thousands of dead invertebrates plus several eels and a number of bullhead fish.

The officer also observed what he believed to be sewage fungus growing in the watercourse for about 1km up to Meerbrook Way. The smell of sewage was strong and the fungus was covering the entire width of the brook.

Further investigations revealed that where the brook exited the A38 at Meerbrook Way, the officer saw what he believed to be a discharge of crude sewage coming out of the bankside into the brook.

An ecological impact assessment concluded that 1.7km of Dimore Brook had been affected and that the vast majority of aquatic animal life had been killed by the sewage discharge.

Between Fisher’s Bridge and the Gloucester-Sharpness Canal, approximately 50 dead European eel, 20 bullhead, 3 chub and 400 three-spined sticklebacks were observed. Environment Agency officers said that Severn Trent had responded to the incident in a timely manner.

Gloucestershire Wildlife Trust is using the funds in a three-year programme to improve various projects close to the impacted area.