EVANTON WWTP - Secondary Treatment Plant in Evanton, Highland, Scotland

EVANTON WWTP is a municipal wastewater treatment facility located in Evanton, Highland, Scotland. It serves a population of around 1,985, classifying it as a small agglomeration under UK and EU regulatory frameworks. The plant is situated near the coast, within 10 km of the shoreline, which influences its discharge requirements. The plant provides secondary treatment, a standard level for communities of this size in the United Kingdom. Under the Urban Waste Water Treatment Directive (transposed into UK law), secondary treatment is required for inland discharges, while coastal discharges may have specific conditions. The plant's designed capacity is 2,534 m³/day, with an average discharge volume of 441.93 m³/day, indicating operational headroom. The treated effluent from EVANTON WWTP ultimately reaches the Cromarty Firth, a coastal inlet of the Moray Firth in the North Sea. The Cromarty Firth supports diverse marine life, including seabird colonies and marine mammals, and is an important area for aquaculture and fisheries. The plant's discharge is regulated to protect this sensitive coastal environment.

EVANTON WWTP discharges into the Cromarty Firth, a sheltered coastal inlet connected to the Moray Firth and the North Sea. The firth is ecologically significant, supporting populations of Atlantic salmon, sea trout, and harbor seals, and serves as a migratory corridor for seabirds. The area is also used for shellfish farming, requiring careful management of nutrient and pathogen inputs from wastewater.