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September 17, 2026HydrologyOpen Access

Water Quality Indices for Irrigation and Drinking Water Supply: The Importance of Use-Specific Assessment

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Authors

DMDaphne Heloísa de Freitas MunizJMJuaci Vitória MalaquiasEOEduardo Cyrino Oliveira-Filho

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Overview

Observational study reveals divergent classifications between drinking and irrigation water indices across river basins, highlighting the need for use-specific resource assessments.

Key Points

  • Compare surface water quality classifications between indices designed for public drinking water supply and agricultural irrigation using a standardized monitoring dataset.
  • Monitored 18 surface water sampling sites across rural, urban, and natural areas in Brazil over 12 bimonthly campaigns (N=216 total samples) between December 2017 and October 2019.
  • Evaluated 12 physical, chemical, and microbiological parameters to calculate the public drinking water index (WQICETESB) and the irrigation water quality index (IWQIFD).
  • The drinking water index classified 16 sites as "Good" (52–79) and two as "Reasonable" (37–51), with zero sites classified as "Excellent".
  • The irrigation index classified six sites as "Excellent" (90–100), seven as "Good" (75–89), and five as "Average" (51–74), yielding more favorable assessments than the drinking index.
  • Water quality did not differ significantly by broad land-use category, but significant seasonal variations occurred for water temperature, turbidity, total phosphorus, and total nitrogen.

Cite This Study

Muniz et al. (2026) studied this question.

synapsesocial.com/papers/6aabb6c75f706d05830e564fhttps://doi.org/10.3390/hydrology13090252
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