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Pollution and the environmentQuestion 352 of 352

How does the federal rule treat a holding tank that only stores sewage and flushwater?

  1. As a Type I device
  2. As a certified Type III device
  3. As a Type II device
  4. As a device with no federal status
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Correct answer: As a certified Type III device

A tank that only stores sewage and flushwater counts as a Type III device. It is certified when it meets the tank rules.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 159: Marine Sanitation Devices, § 159.12a Certification of certain Type III devices

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Questions last reviewed: 18 October 2026