8.4 Disaster Response & Incident Command

National Incident Management System (NIMS) & ICS

The National Incident Management System (NIMS) is a comprehensive, nationwide approach to incident management. Developed by the Department of Homeland Security, it provides a systematic, proactive framework guiding government agencies at all levels (federal, state, local, tribal), non-governmental organizations (NGOs), and the private sector to work seamlessly together. NIMS is universally applicable regardless of the cause, size, location, or complexity of the incident.

The core, on-the-ground operational component of NIMS is the Incident Command System (ICS).

ICS Structure and Principles

ICS is a standardized, on-scene, all-hazards incident management approach. It is explicitly designed to be highly modular and scalable; it can expand rapidly or contract smoothly based on the evolving size and complexity of the emergency. ICS establishes common terminology (eliminating confusing 10-codes) and a clear, unbroken chain of command.

• Incident Commander (IC): The IC has overall, ultimate responsibility for managing the entire incident. The IC establishes core incident objectives, directs the response strategies, and is ultimately legally and operationally responsible for responder safety.
• Unified Command: This structure is utilized when incidents cross geographical jurisdictional boundaries (e.g., a massive chemical spill affecting two different counties) or involve multiple agencies with distinct statutory authorities (e.g., police investigating terrorism, fire managing hazmat, and public health managing exposure). In a Unified Command, leadership from all involved agencies work together to establish common objectives in a single Incident Action Plan (IAP), rather than having a single IC dictate to other sovereign jurisdictions.

Command Staff

The Command Staff reports directly to the Incident Commander and handles specific, high-level administrative, safety, and liaison functions:

• Public Information Officer (PIO): The PIO interfaces directly with the public, media, and other agencies with incident-related information requirements. The PIO ensures that accurate, unified, and timely messaging is released, preventing conflicting information from different agencies.
• Safety Officer: The Safety Officer continuously monitors incident operations and advises the IC on all matters relating to operational safety, including the physical and mental health of emergency responder personnel. Crucially, the Safety Officer has the unilateral authority to halt any unsafe operation immediately without checking with the IC first.
• Liaison Officer: The Liaison Officer serves as the incident command's primary point of contact for representatives of other assisting or cooperating governmental agencies, NGOs (like the Red Cross), and private sector partners.

General Staff

The General Staff is responsible for the functional, tactical aspects of managing the incident, divided into four core sections:

• Operations Section: The "doers." This section directs all tactical actions on the ground to achieve the specific incident objectives established by the IC. If a levy needs sandbagging, Operations does it.
• Planning Section: The "thinkers." This section collects, evaluates, and displays incident intelligence and information; tracks all resources; and painstakingly prepares the formal Incident Action Plan (IAP) for the next operational period.
• Logistics Section: The "getters." This section provides all support, resources, facilities, transportation, communications equipment, and medical services needed to meet the operational objectives. If Operations needs 10,000 sandbags, Logistics procures and delivers them.
• Finance/Administration Section: The "payers." This section strictly monitors costs related to the incident; provides accounting, procurement, time recording for personnel, and critical cost analyses for state and federal reimbursement (like FEMA public assistance).

Environmental Health Duties During Disaster Response

During a formal NIMS/ICS response, environmental health (EH) personnel are typically deeply embedded within the Operations Section (conducting direct field inspections, sampling, and interventions) or the Planning Section (analyzing epidemiological surveillance data and assessing environmental intelligence).

Water Safety Assessments

Major disasters (earthquakes, catastrophic floods, hurricanes) frequently compromise aging municipal water treatment and underground distribution systems.

• Boil Water Advisories: EH professionals are responsible for aggressively issuing and managing Boil Water Advisories when municipal system pressure drops significantly (allowing contaminated groundwater to backflow into the pipes) or when bacterial contamination (like E. coli) is confirmed via sampling.
• Emergency Disinfection: EH must educate the desperate public on making water safe when municipal systems fail. If boiling is completely impossible due to lack of fuel or power, clear water can be treated with regular, unscented liquid household chlorine bleach (typically 5.25% to 8.25% sodium hypochlorite concentration).
  • Formula: The public must be instructed to add 8 drops (or 1/8 teaspoon) of bleach per gallon of clear water.
  • Process: They must mix it well and let it sit for 30 full minutes before use to ensure adequate contact time for disinfection. There should be a very slight chlorine odor afterward.
  • Cloudy Water: If the water is cloudy or murky, the bleach dosage must be strictly doubled (16 drops or 1/4 teaspoon per gallon) because particulate matter protects bacteria from the chlorine.

Food Safety at Mass Feeding Sites

During massive disasters, mass feeding sites are rapidly established by NGOs (like the Red Cross, Salvation Army, or World Central Kitchen). While staffed by well-meaning and dedicated volunteers, these high-volume sites are exceptionally high-risk for catastrophic foodborne illness outbreaks. Sanitarians must rigorously inspect these sites to ensure:

• Strict adherence to proper hot and cold holding temperatures (keeping hot foods above 135°F and cold foods below 41°F).
• Availability and actual use of adequate, supplied handwashing facilities for all volunteers.
• Safe, commercial sourcing of all food, strictly preventing the use of highly dangerous, unverified donated home-canned goods.

Solid and Hazardous Waste Disposal

Disasters generate truly massive amounts of debris. EH oversees the environmental compliance of establishing and managing temporary debris management sites. A critical duty is ensuring that household hazardous materials (paint, lead-acid batteries, pool chemicals, medical waste) are meticulously separated from standard solid waste and vegetative debris to prevent severe, long-term soil and groundwater contamination.

Recovery Follow-Up

The recovery phase begins as the immediate life-safety emergency response phases out. This grueling phase can last months or even years.

Post-Disaster EH Assessments

• Damage Assessments: EH staff must meticulously inspect heavily regulated facilities (restaurants, grocery stores, public pools, septic systems, private drinking water wells) before officially allowing them to reopen to the public.
• Vector Monitoring and Control: Massive flooding leaves behind extensive standing water, leading to explosive, dangerous mosquito population growth within weeks. Active trapping, surveillance, and large-scale larviciding/adulticiding programs are urgently required to prevent outbreaks of vector-borne diseases like West Nile Virus.
• Mold Remediation: Flooded buildings rapidly develop toxic mold within 24-48 hours. EH heavily advises the public and contractors on proper drying techniques, cleaning with strong bleach solutions, and accurately determining when porous materials (drywall, insulation, carpets, upholstery) absolutely cannot be saved and must be discarded.
• Restoring Public Utilities: EH assists municipal water and wastewater treatment plants with required, extensive bacteriological testing and strict clearance protocols to resume normal operations safely and officially lift public health advisories.