Local health departments

Investigations

• Quick Tips for Successful Case Investigations (PDF)
• Standard Operating Procedure: Legionnaires' Disease Outbreak Investigations (PDF)
• Guidance for Selecting Environmental Consultants (PDF)

Environmental sampling

• Guidance for Environmental Legionella Sampling and Testing (PDF)
• Legionella Environmental Assessment Form (LEAF) (PDF)
• Legionella Environmental Data Collection Sheet (Excel)
• Guidance for Responding to Post-Remediation Environmental Legionella Detections (PDF)

Template letters

• Notification to a Healthcare Facility Associated with a Presumptive Healthcare-Associated Case (PDF)
• Notification to a Healthcare Facility Associated with Two or More Possible Healthcare-Associated Cases (PDF)
• Notification to a Facility (Non-Healthcare) Associated with Two or More Cases within 12 Months (PDF)
• Dear Cooling Tower Operator Letter (PDF)

Healthcare providers

Testing and clinical guidance

• Guidance for Submitting Clinical Specimens for Legionella Testing (PDF)
• What Clinicians Need to Know about Legionnaires' Disease (CDC fact sheet, PDF)

Healthcare facility water management

• Healthcare Facility Water Management Program Checklist (CDC, PDF)
• Reduce Risk from Water (CDC)
• Requirement to Reduce Legionella Risk in Healthcare Facility Water Systems (CMS memo, June 2017, PDF)

CDC Vital Signs

• Legionnaires' Disease Outbreaks (2016): English (PDF) | Español (PDF)
• Legionnaires' Disease (June 2017, PDF)

Disease reporting

• Reporting Requirements and Timeframes
• Legionellosis Communicable Disease Manual Chapter (PDF)
• Case Definitions (CDC)
• Legionellosis Case Report Form (CDC)

Questionnaire templates

• Legionnaires' Disease Cluster Hypothesis-Generating Questionnaire: Word | PDF
• Legionnaires' Disease Cruise Ship Questionnaire (CDC): Word | PDF

Trainings and webinars

• Legionellosis Outbreak Investigations: A Training for Local Health Departments, July 10, 2025: webinar slides (PDF)
• Legionellosis Case Investigations: A Training for Local Health Departments, June 3, 2025: webinar slides (PDF)
• Preventing Legionnaires' Disease: A Training on Legionella Water Management Programs (CDC PreventLD)

Standards and references

Standards and guidelines

• ASHRAE Standard 188: Legionellosis: Risk Management for Building Water Systems
• ASHRAE Guideline 12: Minimizing the Risk of Legionellosis Associated with Building Water Systems
• Model Aquatic Health Code (CDC)

Laboratory

• ELITE Program (CDC)

Healthcare infection control

• Guidelines for Environmental Infection Control in Health-Care Facilities (CDC and HICPAC, PDF)
• Guidelines for Infection Control in Dental Health-Care Settings, 2003 (CDC)
• Guidelines for Preventing Health-Care-Associated Pneumonia, 2003 (CDC)
• Prevention of Health Care-Associated Legionella Disease and Scald Injury from Water Systems (VA)

General information

• Legionnaires' Disease and Legionella (CDC)
• Building owner guidance is on the main Legionnaires' disease page.