'Shocking' levels of sewage pollution in rivers Avon, Severn and Isbourne spark call for urgent pumping station upgrades'It is absolutely disgraceful the way Severn Trent is allowed to run roughshod over our beautiful rivers that appear on our coat of arms'Tewkesbury borough rivers sewage concerns"Shocking" levels of sewage pollution in rivers have prompted calls for urgent investment in upgrading treatment works and pumping stations in Gloucestershire. ‌The River Avon had untreated sewage spilled into it for more than 4,000 hours last year, according to civic chiefs. View 5 Images The River Avon in Tewkesbury (Image: Carmelo Garcia)‌“In 2024, Twynning Sewage Treatment Works spilled untreated sewage for 1,883 hours. And Deputy Mayor George Porter (LD, Shurdington) was scathing with his criticism of Severn Trent. ‌“We must hold Severn Trent to account.