- Imagine this problem
- What counts as a hazardous material in California
- Common examples of hazardous materials businesses may handle
- What physical and chemical traits make a material hazardous
- Does quantity change whether something is hazardous
- What types of hazardous materials exist
- DOT classification for hazardous materials
- Hazardous Materials Business Plan in California
- How the submission process changed since 2013
- What information an HMBP must include
- Responsibilities of the Union City Environmental Programs Division
- How often a business must review and recertify
- When an HMBP must be amended
- The seven required sections of an HMBP
- How an HMBP helps emergency responders
- Exemptions from HMBP reporting
- How businesses can get the latest HMBP rules
- Diagram of how hazard planning connects to reporting
- Summary
This post explains what makes a hazardous material in California, when a business must file a Hazardous Materials Business Plan (HMBP), and what’s inside that plan. You’ll also learn the most common types of hazardous materials and how DOT classes help responders understand risk quickly.
Imagine this problem
Imagine a busy workplace: a repair shop with gas for tools, a janitor closet with strong chemical cleaners, and a warehouse with storage drums. One day, a container tips, leaks, or gets damaged. Now think about this question: How would firefighters know what they’re facing?
California’s rules are designed so businesses and the local program agency can plan ahead—based on material properties, quantity, and the likely hazard if something is released.
What counts as a hazardous material in California
California treats “hazardous material” broadly. In general, a substance can be regulated if it has characteristics that can create danger to people or the environment if released.
The basic characteristics used to decide if something is a regulated hazardous material include:
- toxicity (can harm health)
- flammability (can catch fire)
- corrosivity (can eat away materials and skin)
- reactivity (can cause dangerous reactions)
- radioactive materials (included for regulated purposes)
California law also recognizes that a material may be regulated when its physical characteristics or quantity could threaten the environment.
The idea behind the phrase “because of its…”
A material can be hazardous because of its:
- physical properties
- chemical characteristics
- quantity
- (and in some cases) infectious characteristics
Common examples of hazardous materials businesses may handle
Many everyday business supplies can be hazardous. Common examples include:
| Where you might see it | Example hazardous material | Why it’s a hazard |
|---|---|---|
| Cleaning areas | Concentrated cleaning products, acids (like battery acid electrolyte) | Corrosive |
| Garages and shops | Gasoline, alcohols, lubricating oils | Flammable or toxic risks |
| Cooling equipment | Refrigeration gases for coolers and freezers | Often regulated gas risks |
| Paint and maintenance | Aerosol spray cans, paints, parts washer fluids | Can be flammable or harmful |
| Medical and waste streams (where applicable) | Infectious or toxic medical waste materials | Infectious risk |
| Gas storage | Compressed gases such as helium, nitrogen, oxygen, carbon dioxide | Many compressed gas materials can be reportable depending on amount |
What physical and chemical traits make a material hazardous
The hazards usually come from two kinds of clues: what the material is like, and how it might behave.
Physical properties that can make it hazardous
Physical properties can increase risk during a spill, leak, or handling event—especially when they relate to how easily a material spreads or causes harm.
Chemical characteristics that contribute to hazardous behavior
Chemical characteristics often include things like:
- tendency to burn (flammable behavior)
- ability to damage tissue or containers (corrosive behavior)
- tendency to react violently (reactive behavior)
- poisonous effects (toxic behavior)
Infectious characteristics that make it hazardous
Some materials are hazardous because they can carry germs. If a material contains or can spread bacteria or viruses, it becomes hazardous in a special way: infectious.
Does quantity change whether something is hazardous
Yes. The same chemical can be a minor concern at small amounts and a major danger at larger quantity levels.
California law explicitly considers quantity, concentration, and physical or chemical characteristics when deciding if a material poses a significant hazard.
What types of hazardous materials exist
Hazardous materials are often grouped by how they behave and what kind of harm they cause. A clear way to understand this is through common categories:
| Category | What it means in plain words | Example pattern |
|---|---|---|
| Corrosive | Eats through containers or burns skin | Strong cleaners, battery acid |
| Ignitable | Catches fire easily | Flammable liquids, paint removers |
| Reactive | Can explode or release dangerous fumes | Materials that react with heat or water |
| Radioactive | Can give dangerous radiation | Radioactive materials |
| Toxic | Poisonous effects to health | Poisonous chemicals |
| Infectious | Carries germs that can cause disease | Medical waste like contaminated items |
DOT classification for hazardous materials
For transport, the U.S. DOT classifies hazardous materials into hazard classes based on their properties. There are nine DOT hazard classes, including explosives, gas, and corrosives.
Here is the list of Class 1 through Class 8 shown clearly in the DOT scheme used for hazardous transport:
| DOT class | What it covers | Divisions listed in common DOT summaries |
|---|---|---|
| Class 1 | Explosives | 1.1, 1.2, 1.3, 1.4, 1.5, 1.6 |
| Class 2 | Gas | 2.1, 2.2, 2.3 |
| Class 3 | Flammable liquids | (No divisions listed here in the summary) |
| Class 4 | Other flammable substances | 4.1, 4.2, 4.3 |
| Class 5 | Oxidizing substances and organic peroxides | 5.1, 5.2 |
| Class 6 | Toxic and infectious substances | 6.1, 6.2 |
| Class 7 | Radioactive material | 7 |
| Class 8 | Corrosives | 8 |
Explosives divisions
- Division 1.1 Mass explosion hazard
- Division 1.2 Projection hazard, not mass explosion
- Division 1.3 Fire hazard with minor blast/projection, not mass explosion
- Division 1.4 No significant hazard (explosion limited to package)
- Division 1.5 Very insensitive substances with mass explosion hazard
- Division 1.6 Extremely insensitive articles with no mass explosion hazard
Gas divisions
- Division 2.1 Flammable gas
- Division 2.2 Non-flammable, non-toxic gas (often inert, under pressure)
- Division 2.3 Toxic gas
Other named divisions in the summary
- Division 4.1 Flammable solid
- Division 4.2 Substances liable to spontaneous combustion
- Division 4.3 Substances that emit flammable gases in contact with water
- Division 5.1 Oxidizers
- Division 5.2 Organic peroxides
- Division 6.1 Toxic substances
- Division 6.2 Infectious substances
Hazardous Materials Business Plan in California
An HMBP is a planning document. It helps everyone prepare before something goes wrong.
When an HMBP is required
A facility must prepare an HMBP if, at any one time during the year, it uses, handles, or stores hazardous materials (including hazardous waste), in reportable quantities greater than or equal to:
| Material type | Reportable quantity threshold |
|---|---|
| 500 pounds of a solid substance | 500 pounds |
| 55 gallons of a liquid | 55 gallons |
| 200 cubic feet of a compressed gas | 200 cubic feet |
| Extremely hazardous substances | threshold planning quantities |
How the submission process changed since 2013
As of January 1, 2013, California requires HMBP information to be submitted through the California Environmental Reporting System (CERS) website. Paper submittals are no longer accepted.
What information an HMBP must include
An HMBP contains basic information about:
- the location
- the type of hazardous materials
- the quantity
- and the health risks
It also connects to statewide minimum standards and is enforced locally by the Environmental Programs Division as a certified CUPA.
Responsibilities of the Union City Environmental Programs Division
Union City’s Environmental Programs Division conducts routine inspections at businesses that must submit an HMBP.
Their inspection goals are to:
- ensure compliance with HMBP laws and regulations
- identify existing safety hazards that could contribute to an accidental spill or release
- suggest preventive measures to reduce spill or release risk
How often a business must review and recertify
After initial submission, the business must review and recertify its HMBP every year through CERS.
When an HMBP must be amended
If something changes, the plan must be updated.
A deficiency must be amended and submitted within 30 days if any section is found deficient.
Also, amendments must be submitted within 30 days for events such as:
- a 100% or greater increase in the quantity of a hazardous material listed on the inventory
- handling a reportable quantity of a previously undisclosed hazardous material
- deleting a previously disclosed hazardous material
- changes in storage, location, or use that could affect emergency response
The seven required sections of an HMBP
California’s HMBP includes seven sections:
| Required section | What it’s for |
|---|---|
| Business Activities form | What the business does |
| Owner/Operator Identification form | Who is responsible |
| Chemical Inventory Description form | What hazardous materials are involved |
| Site Map | Where materials are stored/used |
| Emergency Response/Contingency Plan | What to do during an incident |
| Employee Training requirements | Training approach and expectations |
| Recordkeeping requirements | How records are kept |
How an HMBP helps emergency responders
The HMBP helps emergency responders—especially the Fire Department—prepare for emergencies that could occur at the facility.
Key benefits include:
- responders can access the current chemical inventory
- responders can reach the emergency coordinator by phone 24 hours a day
- the plan provides the information needed for emergency responders to act effectively during a release or accident
Exemptions from HMBP reporting
Some businesses do not need to complete an HMBP if specific exemptions apply and they do not have other reportable hazardous materials.
Main exemptions listed for HMBP reporting
| Exemption situation | Details |
|---|---|
| Consumer products to the general public | Contained solely in consumer products for direct distribution, less than 5 gallons, and not filled on-site |
| Certain medical professionals with gas | Physician, dentist, podiatrist, veterinarian, or pharmacist storing oxygen, nitrogen, and/or nitrous oxide up to 1,000 cubic feet for each material |
| Lubricating oils (special limits) | Store 55 gallons or less of any specific type of lubricating oil and total all lubricating oils does not exceed 275 gallons (used oil is excluded) |
| Propane for heating employee work areas | Store no more than 300 gallons of propane used only to heat employee work areas |
| Small amounts of certain compressed gases | Store less than 1,000 cubic feet of helium, argon, nitrogen, or xenon gas |
| Need the newest guidance | Contact Environmental Programs for the latest information |
How businesses can get the latest HMBP rules
Because exemptions and rules can change, businesses should use official local and state channels.
For the newest information, businesses are directed to contact Environmental Programs.
Diagram of how hazard planning connects to reporting
flowchart TD
A[Material used or stored] --> B[Check properties and quantity]
B --> C[Is it hazardous]
C --> D[Is it at or above reportable thresholds]
D --> E[Prepare or update HMBP]
E --> F[Annual review and recertify through CERS]
E --> G[Amend within 30 days if changes happen]
E --> H[Fire Department uses info during emergencies]
Summary
A material can be hazardous because of its physical properties, chemical characteristics, and sometimes infectious characteristics, especially when the quantity is large enough to create a real risk. In California, businesses that store or handle certain amounts must file an HMBP, and the process uses CERS (not paper). The plan’s goal is simple: make sure both the business and emergency responders can respond safely using the right inventory and contact information.