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July 5, 2026Discover SustainabilityOpen Access

Five decades of integrated surface water quality monitoring in the Paraíba do Sul river basin reveal persistent regulatory failure and emerging nutrient risks for SDG 6 achievement

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Authors

HTHugo Pimentel TavaresNSNilo Antônio de Souza SampaioJJJoão Ercio Miranda Júnior

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Overview

Integrated analysis reveals water quality deterioration in Brazil's Paraíba do Sul basin, suggesting urgent interventions for sustainability.

Key Points

  • This study aims to evaluate the temporal trends and regulatory compliance of water quality in the Paraíba do Sul River Basin.
  • Analysis of 345,942 water quality measurements from 534 monitoring stations
  • Evaluation of compliance with Class 2 freshwater standards
  • Quantification of temporal trends using linear regression and seasonal dynamics via Mann-Whitney U tests.
  • Only 23.3% of faecal coliform measurements met compliance standards, declining to 16.5% between 2020-2025.
  • Dissolved oxygen compliance improved to 80.7% during 2010-2019 but regressed during the 2014-2015 drought.
  • Nitrate concentrations increased nearly fourfold since baseline, indicating a significant nutrient risk.

Cite This Study

Tavares et al. (2026) studied this question.

synapsesocial.com/papers/6a49f411f5d1d45b287ffbefhttps://doi.org/10.1007/s43621-026-03877-4
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