Approximately what percentage of municipal wastewater is treated and reused for agricultural irrigation nationwide, representing the highest recycling rate globally?

Answer and explanation

Correct answer: D. Nearly 90% of treated wastewater

  1. Step 1: The country reclaims and reuses nearly 90% of its municipal wastewater, primarily for agriculture.
  2. Step 2: Spain ranks second globally at approximately 20% to 25%, making the national reuse rate singular in scope.
Answer
Nearly 90% of treated wastewater.
Why not the others: 50% is an underestimate; 25% is the rate achieved by Spain; 10% is typical of global averages.

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