2.3.3. Nutrients
Although phosphorus, ammonium, nitrate, and particulate nitrogen are not definitive contaminants of wastewater, some researchers have used these markers as indicators of wastewater in stormwater. For example, Pitt (2004) suggested ammonia as a good indicator of illicit discharges of wastewater, particularly when ammonianitrogen concentrations exceed a benchmark value of 0.3 mg/l.