Severn Trent: Hundreds of storm overflows used in Wyre Forest

Storm overflows normally happen when the sewage system is at risk of being overwhelmed – such as after a heavy rain, or during higher levels of groundwater.

In these cases, water companies may need to release excess water and sewage into rivers and the sea, to prevent water backing up into the streets and people's homes.

This has an impact on the quality of our natural water sources, with some charities alleging storm overflows are being misused and under-reported.

Figures from the Environment Agency show storm overflows were used 210 times within Wyre Forest's local authority boundaries in 2022, discharging for a total of around 674 hours.

All of the storm overflows were from Severn Trent Water's network. The water company said they are used only when "absolutely necessary" and contain "almost exclusively rainwater and not sewage".

The figures may not provide a full picture of the amount of water pollution in the area – Wyre Forest may also be impacted by overspills from areas it shares water sources with.

The Rivers Trust said it was particularly concerned by storm overflows being used during hot periods – a risk as England faces a heatwave this week.

Tessa Wardley, director of communications and advocacy at the charity, said: "Discharging untreated sewage in dry weather is bad for both human health and river health – lower river flows mean more concentrated pollutants at a time when more people want to enjoy their rivers."

"Although a problem in their own right, these discharges are also the ‘canary in the coalmine’ pointing to greater problems in our sewerage and river systems. This could be blockages in the system, groundwater seeping into broken pipes, misconnections, or just poor management choices," she added.

She urged "robust, urgent action" on sewage and river management to help tackle the climate crisis and threats to biodiversity.Severn Trent Water saw 44,765 overspills across its network in 2022, with 99% of the company's facilities reporting overspill data last year.

In total there were more than 300,000 overspills across England in 2022 – a 19% reduction on more than 370,000 in 2021, although this may have been the product of weather conditions rather than improved infrastructure.

Water minister Rebecca Pow said the amount of sewage pumped into rivers is "utterly unacceptable", adding the Government has a plan to tackle pollution.

She said: "Targets set by the Government to reduce storm overflows are very strict and are leading to the largest infrastructure programme in water company history – £56 billion over the next 25 years.

"Shortly, water companies will also publish action plans for every storm overflow in England, something the Environment Secretary has personally pressed for," she said.

A Severn Trent spokesperson said: “We understand why people feel let down by water companies when it comes to rivers and we know what needs to be done to make it right, and we’re doing it.

"In Worcestershire, 23 of our wastewater treatment works are receiving a forecasted £100m investment to increase storage capacity helping to reduce the use of overflows and improve river water quality.

"As well as continuing to invest, our River Rangers also monitor rivers in and around Worcestershire, carrying out waterside inspections.

"This helps form part of our industry leading plan, where we’ve committed to causing no harm to rivers by 2030, when in just one year, we’ve reduced our impact already by a third.”