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Infection Control · single question

What is the acceptable microbial range for dental unit waterlines?

  1. 0-500 CFU/mL
  2. 500-1,000 CFU/mL
  3. 1,000-2,000 CFU/mL
  4. No limit
Show answer and explanation

Correct answer: A. 0-500 CFU/mL

  • A. Correct. The CDC/ADA recommended standard for dental unit waterline water quality is ≤500 CFU/mL (matching the standard for safe drinking water).
  • B. This range exceeds the recommended acceptable limit.
  • C. This range significantly exceeds the recommended acceptable limit.
  • D. There IS a recommended limit (≤500 CFU/mL); 'no limit' is incorrect.

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