Secondary Disinfection

Chris Nancrede, EIT, ASSE 12080 has expertise in engineering and implementing comprehensive secondary (or supplemental) disinfection services designed to control waterborne pathogens—especially Legionella—beyond what standard municipal treatment can achieve. These services are essential in reducing Legionella risk, as inadequate disinfectant levels are a known contributing factor in Legionnaires’ disease outbreaks. His approach addresses the unique challenges posed by biofilms, complex plumbing systems, and varied water chemistry across facilities. Unlike providers tied to a single method, his solutions offer fully independent consultation and implementation, selecting the best strategies based on your system’s design, pathogen risks, and compliance requirements.

Chris’s supplemental disinfection solutions include both point-of-entry, hot water loop and system-wide Legionella control strategies. These may involve UV disinfection, different levels of filtration at point of entry or point of use for treatment. Broader residual control can be achieved through methods such as copper-silver ionization, monochloramines, mixed oxidants, or chlorine dioxide—especially effective in targeting biofilms and preventing recolonization. We also consider water chemistry, including pH, conductivity, and hardness to support sustained pathogen control. Every building is evaluated individually to create a tailored plan that is practical, compliant, and cost-effective.