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Israel’s Desalination Plants Keep Shutting After Suspected Microalgae Bloom

Investigators say an organic microalgae bloom likely moved north from the Nile Delta and clogged plant filters, prompting irrigation cutbacks to protect household water.

Overview

  • Most Mediterranean desalination plants stopped and restarted repeatedly over three days, and as of Wednesday only two facilities have been partially brought back online while turbidity recurs.
  • Officials say unusually high seawater turbidity from organic material — likely a microalgae bloom carried northward — clogged prefilters and forced automatic shutdowns of reverse‑osmosis systems.
  • Authorities prioritized household supply and ordered cuts to agricultural and public irrigation, with some regional councils temporarily halting farm watering to conserve treated water.
  • The Israel National Cyber Directorate and Water Authority have ruled out a cyberattack, and seawater samples are being analyzed by oceanographic researchers to confirm the contaminant and its origin.
  • The episode exposes vulnerability in a system that supplies roughly 70% of Israeli homes with desalinated Mediterranean water and could prompt reviews of plant resilience and alternative sourcing.