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Cela permet de s'assurer qu'une tendance estimée ne soit pas attribuable à une tendance dans les débits, donc permet d\u2019évaluer l\u2019efficacité des politiques, des règlements et des mesures correctives déployées pour réduire les apports d\u2019un paramètre dans les cours d\u2019eau et leur milieu récepteur. Ces tendances sont disponibles pour cinq paramètres physicochimiques et un paramètre bactériologique pour la période 2004-2023, soit l\u2019azote ammoniacal dissous, l\u2019azote total dissous, la chlorophylle α active, les nitrites-nitrates dissous, les matières en suspension puis les coliformes fécaux (paramètre bactériologique). Des tableaux et des figures, portant sur les tendances produites, sont disponibles dans la table attributaire du jeu de données.  </p><p>Les tendances temporelles du phosphore total n'ont pas été produites en raison d'une sous-estimation provoquée par un changement de méthode analytique affectant la majorité des données ciblées pour les calculs. En effet, certaines analyses de phosphore réalisées entre 2011 et 2021 peuvent comporter une sous-estimation causée par une interférence des chlorures. Cette possibilité de sous-estimation concerne les appareils munis d\u2019un filtre d\u2019une longueur d\u2019onde de 880 nm et utilisant le chlorure stanneux comme réactif, à la suite d\u2019une digestion au persulfate à l\u2019autoclave. La sous-estimation ne concerne pas les échantillons avec une faible concentration de chlorures. La présence de données sous-estimées et non sous-estimées dans les séries 2004 2023 et 2015 2024 crée une incertitude trop importante pour détecter et estimer correctement les tendances temporelles, ce qui en limite fortement la validité.</p><p>Pour permettre l\u2019analyse et l\u2019interprétation des résultats rendus disponibles, le ministère de l\u2019Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs a publié le <a href=\"https://www.environnement.gouv.qc.ca/EAU/atlas/Documents/egret-guide.pdf\">Guide d\u2019analyse des tendances de la qualité de l\u2019eau des rivières à l\u2019aide du progiciel EGRET</a>. 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