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Geographical location of sampling. (A) POCTEFA area (North Spain and South France). (B) Sampling points of rivers (ASE: Ebro Basin; ASC: Cantabrian Basin; ASA: Adour-Garonne Basin); (C) Sampling points of wastewater treatment plants (WWTPs) and collectors in the Navarra region (ARDe: Discharge of wastewater entering the treatment plant. ARDs: Discharge of wastewater leaving the treatment plant. ARH: Discharge of hospital wastewater. ARM: Discharge of slaughterhouse wastewater).
