Ammonium is a reduced form of nitrogen (NH 4 + ) and together with the non-ionized form (NH 3 ) they compose ammonia. Ammonia is frequently present in groundwater sources where there is no oxygen present.
Results: Since there is no Canadian Drinking Water Guideline for Ammonia you will compare results to the European Union limit. The standard should give a result very close to the 0.5 mg/L colour; if the colour is darker then it DOES NOT meet the guidelines.