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BOATsmart! USA Knowledge Base

Module 04 - Safe Responsible Boat Operation

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No Discharge Zones

A ‘No Discharge Zone’ could be a land-locked waterway, a drinking water intake area or a marine habitat that’s environmentally fragile. In these areasType I and Type II MSDs (the types that discharge treated waste into the water) must not be used and must be secured to prevent accidental release.

How to secure your MSD:

  • Padlock the overboard discharge valves in the closed position.
  • Close the overboard discharge valves and remove the handle.
  • Lock the door to the space where the toilet is kept.

Identifying Pump-Out Stations

If a marina has a Pump-Out Facility for your MSD, there will be a clearly visible sign to identify the Pump-Out Station. 

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