Methods and System for Evaluating and Maintaining Disinfectant Levels in a Potable Water Supply

A method of determining free ammonia composition of a water supply comprising:

• a. obtaining a water sample from a water supply at a sampling location;
• b. adding a chlorine-containing material to the water sample in the presence of an oxidation reduction potential (ORP) measurement device;
• c. generating a plurality of ORP measurements during addition of the chlorine-containing material to the water sample;
• and
• d. estimating a concentration of free ammonia in the water sample, wherein the estimation is derived from the relationship between the added chlorine material and the plurality of ORP measurements.

A system for maintaining the disinfectant level of a potable water supply comprising:

• a. a water quality assessment module comprising:
• i. a plurality of sensors comprising at least an oxidation reduction potential sensor;
• and
• ii. a control module in operational engagement with the plurality of sensors;
• b. a water supply intended for delivery of potable water to a consumer;
• c. a water sampling device comprising a fluid delivery means configured to provide a sample of water derived from the water supply to the water quality assessment module;
• d. a chlorine feed source and an ammonia feed source, wherein each of the sources are independently:
• i. in operational engagement with the water quality assessment module;
• and
• ii. in fluid communication with the water supply,
• wherein the system is configured to measure and adjust the chloramination level and the free ammonia levels of a potable water supply prior to delivery of the water supply to the consumer.