DOLGELLAU ST STW - Wastewater Treatment Plant in Llanelltyd, Gwynedd, Wales

DOLGELLAU ST STW is a wastewater treatment plant located in Llanelltyd, Gwynedd, Wales, United Kingdom. It serves a population of approximately 3,918 people and operates under secondary treatment, which is the standard required by the EU Urban Waste Water Treatment Directive for agglomerations of this size. The plant's designed capacity is 3,918 population equivalents, and it discharges an average daily volume of 872.28 cubic meters of treated effluent. As a secondary treatment facility, the plant uses biological processes to reduce organic matter and suspended solids. This level of treatment is appropriate for inland plants discharging to freshwater environments, as it meets the regulatory standards for protecting water quality. The plant is situated near the coast, within 10 km of the sea, which may influence discharge requirements to prevent nutrient enrichment in coastal waters. The treated effluent from DOLGELLAU ST STW likely discharges into a local watercourse that flows into the Mawddach Estuary, a sensitive coastal ecosystem in Snowdonia National Park. The estuary supports diverse aquatic life and is an important migratory corridor for fish species. The plant's performance is critical to maintaining the ecological health of this protected area.

The plant discharges into a local river that flows into the Mawddach Estuary, which opens into Cardigan Bay in the Irish Sea. The estuary is an ecologically sensitive area supporting diverse aquatic life, including salmon and sea trout, and serves as an important migratory corridor. The surrounding watershed is part of the Snowdonia National Park, known for its high conservation value.