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Microbial Treatment Targets for Potable and Nonpotable Water Reuse - A Comprehensive Update and Harmonization.

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This study establishes risk-based microbial treatment targets for various water reuse applications, including potable reuse and irrigation. It provides essential data for developing "fit-for-purpose" water reuse strategies to protect public health.

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Area of Science:

  • Environmental Science
  • Microbiology
  • Public Health

Background:

  • Growing demand for water necessitates increased water reuse globally.
  • Lack of federal regulations and consistent microbial treatment targets for water reuse applications in the U.S.
  • Need for risk-based targets tailored to specific water sources and end-uses.

Purpose of the Study:

  • To present updated, risk-based microbial treatment targets for diverse water reuse scenarios.
  • To inform the development of "fit-for-purpose" water reuse regulations and guidelines.
  • To address the gap in current literature regarding consistent microbial treatment targets.

Main Methods:

  • Utilized quantitative microbial risk assessment (QMRA).
  • Integrated current modeling inputs and dose-response parameters.
  • Calculated targets based on probability of infection and disease burden.

Main Results:

  • Provided microbial treatment targets for untreated municipal wastewater, onsite wastewater, graywater, stormwater, and roof runoff.
  • Targets are applicable to potable reuse, indoor nonpotable use, and landscape irrigation.
  • Demonstrated a framework for setting health-protective water reuse targets.

Conclusions:

  • The study offers a comprehensive dataset for microbial treatment targets in water reuse.
  • Findings support the development of evidence-based water reuse policies and practices.
  • Promotes safer and more sustainable water management through informed reuse strategies.