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Chlorine: 1.2 - 2.0 ppm (disinfecting drinking water). Ammonia: 0.5 ppm (Forming chloramines, this ensures that the chlorine will last throughout the water system, which is approximately 110 miles of water main in our distribution system.) Fluoride: 1.0 - 1.5 ppm (Mandated by Minnesota Department of Health) Polyphosphate: 1.0 - 1.5 ppm (used for corrosion control and coating of the pipes to prevent the leaching of lead and copper into the drinking water).