For many years, water quality standards for urban pollution were outlined in the second edition of the Urban Pollution Management Manual (UPM2). Regulators and water companies used UPM2 to prepare permit applications and design works to manage problem flows from wastewater pipes.
However, in 2000 new legislation was introduced – the EU Water Framework Directive (WFD) – which has new water quality and ecological standards. This meant the UPM2 standards had to be reviewed against the requirements of the WFD. This project reviewed the UPM2 standards to establish whether they are still valid, or whether they need to be modified.