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Wastewater is any water that has been adversely affected in quality by anthropogenic (human) influence.  It comprises liquid waste discharged by domestic residences, commercial properties, industry, agriculture, and storm water runoff.  

Wastewater management encompasses a broad range of efforts that promote effective and responsible water use, treatment, and disposal.  Improperly managed wastewater can have serious impacts on human health and the environment.    

Wastewater management is governed by the Japan Environmental Governing Standards (JEGS) Chapter 4.  Wastewater from all installations enters the waters of Japan and professionals from both Fleet Activities Yokosuka and the Government of Japan monitor wastewater discharges to ensure regulatory limits are met.

Actions we all need to take to prevent impairing the waters of Japan are:


  • Dispose of hazardous materials down the drain.
  • Flush garbage of any kind down the toilet.
  • Pour grease into sinks or toilets.
  • Wash trash or debris into the storm water system.
  • Pour anything down floor drains.


  • Wash vehicles only at authorized wash racks.
  • Perform maintenance only at authorized locations.
  • Use drip pans under vehicles.
  • Store hazardous materials in doors or undercover.
  • Clean up spills and leaks immediately.
  • Keep outside areas clean.
  • Use dry clean-up methods, i.e. sweeping.
  • Avoid hosing down areas.
  • Keep dumpsters and trash containers closed.
  • Inspect oil water separators regularly.

For further information contact the Wastewater Program Manager.

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