Legionella Control Systems is a specialized engineering firm dedicated exclusively to Legionella risk management.

For over nine decades, Legionella Control Systems has partnered with clients to improve water safety, purification, and system efficiency. Originally established in 1932 in Indianapolis by Henry T. Nancrede, the company was built on a foundation of integrity, customer commitment, and engineering excellence.

Today, under the leadership of Chris Nancrede, our firm remains true to these founding values. In June 2023, we divested the majority of our non-pathogen-related consulting operations to concentrate entirely on our core expertise: Legionella control.

Our approach is built on independence and technical breadth. We are not tied to a single treatment method, allowing us to offer unbiased, custom strategies that integrate both chemical and non-chemical solutions to combat Legionella and other harmful waterborne microorganisms. These services include in-depth site assessments, water management plans, diagnostic testing, and our proprietary, patent-pending control systems.

Because Legionella Control Systems operates without allegiance to any one product or method, we are uniquely positioned to evaluate and implement the most effective control and mitigation strategies tailored to your facility’s specific needs. Unlike providers who promote a singular solution, we prioritize what works best for your situation.

Our services cover every stage of Legionella management—from testing and ongoing monitoring to remediation and long-term prevention. We develop water safety programs for facilities across a wide range of sectors, including:

Healthcare

  • Hospitals
  • Nursing Homes
  • Long-Term Care
  • Assisted Living
  • Acute Care Facilities

Government

  • Correctional Institutions
  • Jails
  • Federal and State Facilities

Education and Hospitality

  • Schools and Universities
  • Hotels and Resorts
  • Conference Centers

Commercial and Industrial

  • Food and Beverage Processing
  • Retail Properties
  • Apartment Complexes
  • Condominium Buildings
  • Manufacturing Plants

Our team is certified under the ASSE/IAPMO/ANSI 12080 Professional Qualification Standard for Legionella Water Safety and Management Personnel. Our lead personnel, including Chris Nancrede, are credentialed as ASSE 12080 Legionella Water Safety and Management Specialists.

If your facility has been flagged by the health department, The Joint Commission, or has experienced a confirmed case of Legionnaires’ disease, the consequences can be serious—affecting public safety, your organization’s reputation, and even your professional future.

Reach out to us immediately to take proactive, expert-guided steps toward comprehensive Legionella control.

We can help you with all of your water treatment needs. Contact a Secondary Disinfection Systems expert today.

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