Revised 6/4/2013
Total Nitrogen
Total Nitrogen is an essential
nutrient for plants and animals.
However, an excess amount of
nitrogen in a waterway may lead to
low levels of dissolved oxygen and
negatively alter various plant life and
organisms. Sources of nitrogen
include: wastewater treatment
plants, runoff from fertilized lawns
and croplands, failing septic
systems, runoff from animal manure
and storage areas, and industrial
discharges that contain corrosion
inhibitors.
Storm runoff from a cattle operation can increase Total Nitrogen
levels in a water body.
Understanding Total Nitrogen: There are three forms of nitrogen that are commonly
measured in water bodies: ammonia, nitrates and nitrites. Total nitrogen is the sum of total
kjeldahl nitrogen (ammonia, organic and reduced nitrogen) and nitrate-nitrite. It can be derived by
monitoring for organic nitrogen compounds, free-ammonia, and nitrate-nitrite individually and
adding the components together. An acceptable range of total nitrogen is 2 mg/L to 6 mg/L, though
it is recommended to check tribal, state, or federal standards for an adequate comparison of your
data.
Monitoring Equipment: Depending upon
monitoring objectives set forth in an
environmental program, the following
equipment options are commonly used to
collect total nitrogen data from the field.
Readily available and economically priced:
• Total Nitrogen Kits
For each component of total nitrogen, the
following can be used and are of greater
precision and higher cost:
• Meters
• Multiparameter Probes
• Contract Laboratories (if necessary)
For additional information:
Trash areas like this may leach chemicals that can increase Total www.epa.gov/OWOW/monitoring/Volunteer/Stream
Nitrogen during a storm event into a water body.
For more information, please contact your CWA Project Officer or Kristin Gullatt, Manager of the Water Division, Tribal Office at (415) 972-3432.
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