Plean Waste Water Treatment Works - Secondary Treatment Plant in Stirling, Scotland

Plean Waste Water Treatment Works is a municipal wastewater facility located near the village of Plean in Stirling, Scotland, United Kingdom. The plant serves a population of approximately 1,979 people, classifying it as a small agglomeration under Scottish water regulations. The facility provides secondary treatment, which is the standard level required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for inland discharges from agglomerations of this size. The plant has a designed capacity of 3,050 m³/day and currently discharges an average of 440.59 m³/day of treated effluent. The treated wastewater is discharged into the local water environment, which ultimately drains into the Firth of Forth via the River Forth. The plant's proximity to the coast (within 10 km) means its discharge can influence coastal water quality, supporting the ecological health of the Forth estuary and the North Sea.

The plant discharges into the River Forth catchment, which flows into the Firth of Forth, a major estuary on Scotland's east coast. The Firth of Forth supports diverse aquatic life, including important fish populations and migratory birds. The plant's secondary treatment helps protect this sensitive coastal environment from nutrient enrichment and pollution.