HAUGHLEY STW - Secondary Wastewater Treatment Plant in Mid Suffolk, England

HAUGHLEY STW is a wastewater treatment plant located in Mid Suffolk, Suffolk, England, serving a population of 2,251. The facility operates under the regulatory framework of the United Kingdom, which implements the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this scale. As a secondary treatment plant, it provides biological treatment to reduce organic matter and suspended solids before discharge. The plant has a designed capacity of 3,188 m³/day and currently treats an average daily flow of 501.15 m³/day, indicating significant spare capacity. Under UK regulations, secondary treatment is the minimum standard for inland freshwater discharges, ensuring compliance with environmental quality standards. The plant is owned and operated by the local water utility, which is responsible for maintaining permit conditions set by the Environment Agency. The treated effluent is discharged into local rivers that drain into the North Sea via the Suffolk river system. The receiving water bodies support diverse aquatic life and are important for regional biodiversity. The plant's location more than 10 km from the coast reduces direct marine impact, but its discharge contributes to the overall water quality of the catchment.

The treated wastewater from HAUGHLEY STW enters local watercourses that flow into the River Gipping and eventually the Orwell Estuary, which discharges into the North Sea. The Suffolk river system supports a variety of fish species and aquatic invertebrates, and the estuary is an important habitat for migratory birds. The plant's secondary treatment helps protect these ecosystems from nutrient enrichment and organic pollution.