June 24, 2026

Why More Facilities Are Being Asked for Dust Hazard Analysis

Many facilities first learn about Dust Hazard Analysis (DHAs) through an insurance survey, a fire marshal inquiry, a permit review, or a customer requirement. Because combustible dust is not governed by a dedicated OSHA standard, it is often assumed that DHAs are optional. In reality, many jurisdictions have adopted fire and building codes that reference NFPA combustible dust standards, which can create DHA obligations for facilities that handle combustible particulate solids.

In this blog post, you will explore:

The Quiet Shift: Fire Codes, Not OSHA Standards
Why You Have Not Heard About DHA Until Now
How NFPA Standards Connect to Local Requirements
How to Check Whether DHA Requirements Apply to Your Facility
Common Events That Trigger DHA Discussions
A DHA is More Than Just a Compliance Exercise
The Real Cost of “Checking the Box” on a DHA
The Value of a Well-Executed DHA
DHA as an Ongoing Part of Risk Management
How Sigma-HSE Can Help

The Quiet Shift: Fire Codes, Not OSHA Standards

The skepticism around the DHA requirement may be as simple as: there isn’t a specific OSHA standard titled “Combustible Dust,” the way there are for other facility hazards. Without a specific OSHA regulation to point to, it is easy to assume that combustible dust management—and the DHA in particular—is just guidance.

However, the DHA requirement generally does not originate with OSHA. Instead, it is commonly tied to adopted fire and building codes that reference NFPA combustible dust standards. Depending on the jurisdiction and code edition in force, combustible dust requirements may become enforceable through the local Authority Having Jurisdiction (AHJ).

Why You Have Not Heard About DHA Until Now

Many facilities have operated for years without being asked about a DHA. Today, the topic is increasingly raised when:

Modifying an existing facility or building a new facility, and the building inspector or fire official checks the applicable codes
The facility insurer sends an agent who recognizes combustible dust conditions on the floor
Corporate EHS or an external auditor reviews your program against NFPA 652/660

As awareness and enforcement have increased, organizations are finding that combustible dust expectations may already exist within their adopted code framework.

How NFPA Standards Connect to Local Requirements

NFPA 660 and its predecessor, NFPA 652, establish the foundational expectation that facilities handling combustible particulate solids evaluate combustible dust hazards through a DHA. While NFPA standards are not federal laws by themselves, they are frequently incorporated into adopted fire and building codes such as NFPA 1 and the International Fire Code (IFC). Once adopted, those code provisions may become enforceable at the local level.

For example:

NFPA 1 (2018) Section 40.3.1 states: “Existing facilities shall perform a dust hazard analysis (DHA) in accordance with Chapter 7 of NFPA 652.”
The International Fire Code (IFC 2018) Chapter 22 requires that “the requirements of NFPA 652 apply to all new and existing facilities and operations with combustible dusts,” and explicitly calls for existing facilities to have a DHA completed per NFPA 652 timelines.

Because NFPA 1 and the IFC are adopted at the state, county, or municipality level, the specific edition and section numbers may vary by jurisdiction—but in practice, most modern codes now expect a DHA for facilities that handle or generate combustible dust. If your operations handle combustible particulate solids that are combustible or explosible—and you have not performed a DHA — your facility may have combustible dust obligations that have not yet been formally addressed.

Because NFPA 1 and the IFC both point to the specific combustible dust standards, the requirements for completing DHAs and their timing are specifically outlined in those standards. NFPA 652 required DHAs to be completed on existing processes and facility compartments by September 7, 2020, with revalidation at least every five years. The revised combustible dust standard, NFPA 660, carries forward the fundamentals of other standards in a consolidated format. The deadlines have passed; “we haven’t had an incident” is not accepted in the standards as a reason to delay or avoid a DHA.

How to Check Whether DHA Requirements Apply to Your Facility

A practical first step is to determine which fire code has been adopted by your state, county, city, or local Authority Having Jurisdiction (AHJ). Most states, counties, and municipalities publish their adopted fire codes online.

When reviewing your jurisdiction’s fire code information, it helps to confirm:

Which code is adopted, commonly either NFPA 1 or the International Fire Code (IFC)
Which edition year is currently in force, since the section numbering and referenced standards can vary by code cycle

If this information is not readily available, your local fire marshal or building department can usually provide it.

If your jurisdiction uses NFPA 1, Fire Code, combustible dust requirements are generally addressed in Chapter 40, Dust Explosion and Fire Prevention. This chapter functions as an umbrella section that points the user to the applicable combustible dust standards based on the material and process involved.

If your jurisdiction uses the IFC, the place to start is Chapter 22, Combustible Dust-Producing Operations. This chapter establishes the baseline requirement to comply with the IFC and NFPA 652 (and other NFPA combustible dust standards) for operations involving combustible dust hazards. Section 2201 (or the corresponding section in your edition) defines the scope for equipment, processes, and operations involving dust explosion hazards.

NFPA 652 has historically served as the core foundational standard for combustible dust hazard management and established the baseline DHA requirement for facilities handling combustible particulate solids. Depending on the material and operation, NFPA 1 and the IFC direct users to the applicable commodity-specific NFPA standards, such as:

NFPA 61 for agricultural and food facilities
NFPA 484 for combustible metals
NFPA 654 for many chemical, plastic, and pharmaceutical dust applications
NFPA 655 for facilities processing and handling sulfur, and
NFPA 664 for woodworking and wood processing.

Any code editions adopted from 2025 onward now recognize NFPA 660 as the consolidated standard on combustible dust hazard management, which combines all of the above NFPA dust standards into a single source.

If your facility generates, handles, or processes particulate solids that could be combustible, and your operation falls under one of these references, the codes and standards framework indicates that combustible dust hazard analysis and management are relevant to your site.

If questions remain, contact your local fire marshal, building official, or corporate EHS team and ask whether a DHA is expected for your operation based on the adopted fire code and referenced standards. This type of self-check does not replace a formal code review, but it can provide a practical starting point and often helps clarify whether combustible dust requirements may already apply to your facility.

Common Events That Trigger DHA Discussions

Even where DHA expectations have not been actively enforced, three regular events commonly bring them to the forefront:

Capital Projects and Equipment Changes
- New dust collectors, silos, conveyors, or process lines, which require the design to align with NFPA Combustible Dust Standards.

- Building officials and fire marshals increasingly require a DHA as part of the permit package before signing off on construction or occupancy.
Insurance Audits and Policy Renewals
- Property insurers, such as FM Global and other commercial carriers, routinely reference NFPA 652/NFPA 660 and IFC requirements in their combustible dust guidance.
- When visible dust accumulation or inadequately protected equipment is observed without an underlying DHA, insurers may impose conditions, increase premiums, or, in some cases, limit or withdraw coverage.
OSHA-Related Inspections
- While OSHA does not have a dedicated “Combustible Dust Standard,” it actively cites combustible dust hazards under the General Duty Clause (OSH Act of 1970, Section 5(a)(1)), which states that “Each employer shall furnish to each of his employees employment and a place of employment which are free from recognized hazards that are causing or are likely to cause death or serious physical harm to his employees”.
- OSHA inspectors frequently use NFPA 652/NFPA 660 and related documents as evidence of a recognized industry hazard when issuing citations.

In all three scenarios, organizations are often asked to demonstrate that combustible dust hazards have been systematically evaluated.

A DHA is More Than Just a Compliance Exercise

A Dust Hazard Analysis is not a permit, certification, or pass/fail inspection. It is a systematic risk evaluation used to identify where combustible dust hazards may exist, assess existing safeguards, and determine whether additional risk reduction measures may be appropriate.

A well-executed DHA helps facilities understand fire, flash fire, and explosion risks while prioritizing practical actions that support safer operations. When performed properly, a DHA provides:

A clear map of where combustible dust is generated or handled, where it can escape equipment, where it accumulates, and how it can be disturbed into clouds or settled into layers.
A realistic view of ignition sources, confinement, and propagation pathways that could turn a small event into a catastrophic incident.
A prioritized, risk‑based set of recommendations so you can focus resources on the changes that most effectively reduce risk.

That combination of documentation and action planning is what demonstrates due diligence to regulators, insurers, corporate leadership, and, most importantly, your workforce.

The Real Cost of “Checking the Box” on a DHA

A DHA should be more than a ‘checkbox’ exercise. When performed as a minimal checklist or a templated, off-the-shelf report, important facility-specific hazards can be overlooked, and the effectiveness of existing safeguards may not be fully evaluated.

The consequences of an incomplete or poorly executed DHA can extend far beyond compliance concerns. Potential impacts include:

Personal and corporate liability following an incident, particularly where investigations determine that combustible dust hazards were foreseeable but were not adequately evaluated or addressed.
OSHA General Duty Clause citations, where NFPA 652/660 and related standards may be referenced as evidence of recognized combustible dust hazards and accepted industry practices.
Increased insurance scrutiny, higher premiums, coverage limitations, or corrective action requirements when combustible dust hazards have not been systematically evaluated.
Missed opportunities to identify practical safeguards and risk-reduction measures before a fire, flash fire, or explosion incident occurs.

The Value of a Well-Executed DHA

Conversely, a well‑executed DHA led by a qualified combustible dust specialist provides a documented understanding of combustible dust hazards and a practical plan to address them. It also supports discussions with insurers and AHJs while helping facilities make informed decisions regarding housekeeping, ignition source control, equipment protection, capital projects, and future process changes.

A completed DHA that is being actively used and maintained demonstrates that:

Combustible dust hazards have been evaluated through a structured, facility-specific process rather than generic safety checklists
Combustible dust considerations are incorporated into Management of Change (MOC), capital planning, maintenance activities, and operational decision-making
Identified recommendations are being prioritized and addressed as part of an ongoing risk-reduction strategy

This is the type of documentation AHJs, insurers, and corporate stakeholders often look for during permit reviews, inspections, audits, and following near misses or incidents.

DHA as an Ongoing Part of Risk Management

Combustible dust conditions evolve as production rates increase, materials change, and equipment is added, removed, or modified. NFPA 652 and NFPA 660 explicitly require DHA revalidation at least every five years or after significant process changes, to ensure that the analysis still matches real operating conditions.

When integrated into your ongoing process safety and engineering workflows, the DHA becomes:

A recurring input to project design reviews and MOC processes
A reference point for housekeeping expectations, ignition source control, and inspection priorities
A tool for communicating combustible dust risk across operations, maintenance, and management teams in a consistent, technically grounded way

How Sigma-HSE Can Help

Determining whether combustible dust requirements apply to your facility is not always straightforward. Understanding which codes have been adopted, which standards apply to your materials and processes, and whether a DHA is expected can quickly become confusing.

Sigma-HSE specializes in combustible dust testing, Dust Hazard Analyses (DHAs), and combustible dust risk management. We help facilities move beyond uncertainty by identifying hazards, evaluating compliance obligations, and developing practical, risk-based solutions that support safe, reliable operations.

If your facility is trying to determine whether a DHA may apply—or if you’ve been told you need one but aren’t sure where to begin—we’re happy to help.

Contact our technical team to discuss your project.

Email: info-us@sigma-hse.com
Phone: +1 (978) 880-5076