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Managing Disinfectant Residuals in Water Distribution Systems

Maintain minimum residual levels in the distribution system to meet regulatory compliance.


Distribution system water quality is a primary factor in balancing regulatory compliance and customer satisfaction. Operators must carefully regulate the residual disinfectant in drinking water while reducing the potential for disinfection byproduct formation.

Chloramines, also known as secondary disinfection, are commonly formed when ammonia is added to chlorine to treat drinking water. They generally provide longer-lasting disinfection as the water moves through distribution pipes to the tap. The US EPA has set Maximum Residual Disinfectant Level Goals (MRDLG) — the highest level of disinfectant that can be left in drinking water before there are known or expected health risks — for chlorine and chloramine. The federal MRDLG is four (4) parts per million for both disinfectants.

Our Solution

Traditional operational procedures to manage disinfectant levels in the distribution network are costly and time-consuming. The Monoclor® RCS chloramine management system is an intelligent, automated disinfectant boosting system that allows operators to set, control, and cost-effectively maintain residual levels in water storage tanks and key locations in the distribution system.

How Does Monoclor® RCS Chloramine Residual Management System Work

A diagram of a RCS System.

The Monoclor® RCS chloramine management system performs four discrete functions at the storage tank level to proactively control disinfectant levels in drinking water, preventing nitrification and coliform contamination.


Powerful tank-mixing technology ensures homogeneous tank chemistry so tanks do not become thermally stratified. This also ensures that disinfectant levels remain consistent throughout the tank.

Monitoring Safe Chlorine Levels

The Monocolor® RCS chloramine management system analyzes changing tank conditions. Then, an automated chemical feed system and an advanced control algorithm maintain the residual levels.

Controlling Chloramine Disinfection Levels

A sophisticated control algorithm instantly responds to changing levels, employing real-time data to calculate the dosing of chemical reagents needed automatically.

Dosing Chemicals for Precise Treatment

The system tracks changes in tank water quality, relying on a process control feedback loop with reliable chemical dosing skids to achieve precise levels.

To maintain the long-term efficiency of the Monoclor® RCS system once installed, USG provides a proactive Asset Management Program. The program includes an extended warranty on both the smart controller and water quality station controls and a yearly inspection of the system during the life of the agreement.

Value of Monoclor® RCS chloramine management system

Maintains quality of drinking water

Simplifies control

Reduces costs

Featured Projects


Keeping stable disinfectant residuals in distribution system in water stressed CA

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Solving a nitrification problem in a distribution system in Loudoun County, VA

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Additional Resources

Solutions to maintain the quality of treated water in the distribution network
Disinfectant Residual Control System

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