L_FR PG WWTW STW - Secondary Wastewater Treatment Plant in Llanfairpwllgwyngyll, Wales

L_FR PG WWTW STW is a wastewater treatment plant serving the community of Llanfairpwllgwyngyll on the Isle of Anglesey, Wales, United Kingdom. The plant provides secondary treatment for a population of 3,399, with a designed capacity of 3,399 population equivalents and a daily discharge volume of 756.74 cubic meters. As a secondary treatment facility, it meets the minimum standard required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The plant's operation is subject to regulation by Natural Resources Wales, which issues permits under the Water Resources Act 1991 and the Environmental Permitting Regulations. The plant's treated effluent is discharged into the Menai Strait, a tidal channel separating Anglesey from mainland Wales. The strait supports diverse marine life and is an important migratory corridor for fish and birds. The discharge ultimately flows into the Irish Sea, contributing to the overall water quality of the region.

The plant discharges into the Menai Strait, a narrow tidal channel that connects the Irish Sea to the north with Caernarfon Bay to the south. The strait is ecologically sensitive, supporting diverse marine habitats including seagrass beds and rocky reefs. It serves as a key migratory route for Atlantic salmon and sea trout, and its intertidal zones provide feeding grounds for wading birds. The discharge point is within 10 km of the open coast, meaning treated effluent can influence nearshore water quality and marine ecosystems.