Total Nitrogen is a the total amount of nitrogen-containing molecules in a sample of water, measured as a concentration in milligrams per liter (mg/L). This includes:

  • Ammonia (NH3)
  • Total Kjehldahl Nitrogen (TKN)
  • Nitrates (NO3)
  • Nitrites (NO2) 

In terms of I/A systems on Cape Cod, Total Nitrogen is the effluent sampling parameter of primary regulatory concern.