Lenham STW - Secondary Wastewater Treatment Plant in Maidstone, Kent

Lenham STW (Sewage Treatment Works) is a municipal wastewater facility located near Lenham, a village in the Maidstone district of Kent, England. The plant serves a population equivalent of 3,073 and operates under the regulatory framework of the UK Environment Agency, which enforces discharge standards consistent with the EU Urban Waste Water Treatment Directive (transposed into UK law). 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 3,073 population equivalent and currently treats an average daily flow of 684.16 m³. Its capacity utilization is within expected ranges for a facility of this scale. Under UK regulations, secondary treatment is the minimum standard for inland freshwater discharges, and the plant's performance is monitored through periodic sampling and compliance reporting. The treated effluent from Lenham STW is discharged into a local watercourse that drains into the River Len, a tributary of the River Medway. The Medway flows through the Kent countryside and eventually into the Thames Estuary, a major ecological and economic resource. The plant plays a key role in protecting the water quality of these downstream environments, supporting aquatic life and recreational uses.

Lenham STW discharges into a small watercourse that feeds the River Len, which joins the River Medway near Maidstone. The Medway flows northward through the Kent Downs Area of Outstanding Natural Beauty and enters the Thames Estuary, a critical habitat for migratory birds and fish species. The plant's secondary treatment helps reduce nutrient loads and organic pollution, safeguarding the ecological health of the Medway catchment and the estuarine environment downstream.