Cromwell STW - Wastewater Treatment Plant in Newark and Sherwood, England

Cromwell STW is a wastewater treatment plant located near Cromwell Lock in the Newark and Sherwood district of Nottinghamshire, England. It serves a population of around 4,591 people, placing it in the small agglomeration category under UK regulatory frameworks. As a small-scale treatment facility, Cromwell STW is subject to the UK's implementation of the EU Urban Waste Water Treatment Directive (now retained in UK law). This directive requires secondary treatment for inland plants serving populations between 2,000 and 10,000, with appropriate discharge standards to protect receiving waters. The plant's treated effluent is discharged into the local water environment, ultimately contributing to the River Trent catchment. The River Trent flows through the East Midlands and drains into the Humber Estuary, which supports diverse aquatic life and is an important ecological corridor for migratory fish species.

Cromwell STW discharges into the River Trent catchment, which flows through Nottinghamshire and eventually reaches the Humber Estuary. The Humber Estuary is a major ecological feature supporting diverse bird populations, fish species, and intertidal habitats. The plant's location inland, over 50 km from the coast, means its discharge primarily affects freshwater ecosystems before reaching the estuary.