Walk through almost any California business, and you’ll find hazardous materials involved in every step of the process. A manufacturer uses chemicals on the production line. A construction crew relies on solvents. An oil and gas site stores diesel fuel. Farms, auto shops, and hospitals all handle regulated materials every day.

These materials help keep our economy running. They also carry real risk. If there’s a fire or a spill, first responders need to know what’s inside a building before they walk through the door. That knowledge also helps them choose the safest way to fight a fire.

That’s where California’s Hazardous Materials Business Plan (HMBP) Program comes in. In this post, we’ll cover what counts as a hazardous material, who needs an HMBP, how to stay in compliance, what’s changed in recent years, and which exemptions may apply to you.

What Is California’s HMBP Program?

The HMBP Program is a state program that protects public health, safety, and the environment. It requires businesses that handle hazardous materials to share key information with local agencies. That information includes what materials are on site, where they’re stored, and how the business will respond in an emergency.

There are three acronyms to be aware of with the program:

• CalEPA oversees the program statewide. It sets the overall regulations and guidance. It also delegates authority to local agencies, which can sometimes set stricter requirements.
• Certified Unified Program Agencies (CUPAs) are the local agencies that review plans, inspect facilities, and enforce the rules.
• The California Environmental Reporting System (CERS) is the online portal where businesses submit their HMBPs. CERS routes each plan to the right local agency.

Because enforcement happens locally, your experience can vary depending on where your facility sits. More on that later.

What Is a Hazardous Material?

The word “hazardous” can mean different things depending on which regulation you’re reading. For the HMBP Program, the definition is broad:

“‘Hazardous Material’ means any material that, because of its quantity, concentration, or physical or chemical characteristics, poses a significant present or potential hazard to human health and safety or to the environment if released into the workplace or the environment.”

In plain terms, if a material could harm people or the environment in a release, it likely counts. Under this definition, you should expect to include:

• Hazardous substances. This includes anything defined as a hazardous substance by the U.S. Department of Transportation (DOT) or under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA).
• Hazardous waste. This includes waste that meets federal or California definitions of hazardous waste.
• Most materials with a Safety Data Sheet (SDS). Here’s a good rule of thumb. If a material has an SDS, assume it may be reportable. Unless the SDS clearly states the material is non-hazardous, a CUPA could likely argue it’s subject to HMBP. When in doubt, check with your CUPA or an expert.

Hazardous waste comes with its own set of rules and definitions under the federal Resource Conservation and Recovery Act (RCRA). If you want a deeper look at how hazardous waste is identified and managed, our RCRA Foundations guide breaks down the basics.

Does Your Facility Need an HMBP?

In general, you need an HMBP if your facility handles a hazardous material at or above these amounts at any one time during the year:

• 55 gallons of a liquid
• 500 pounds of a solid
• 200 cubic feet of a compressed gas

Some materials trigger reporting at much lower amounts. Extremely hazardous substances, for example, have their own, lower thresholds. Some CUPAs also set stricter thresholds than the state. Facilities that must file federal EPCRA Tier II reports need an HMBP too.

If you’re close to a threshold, it’s worth a closer look. Many facilities cross the line without realizing it.

How to Stay in Compliance With HMBP

HMBP compliance runs on a yearly cycle. Here’s what the path looks like.

1. Take Inventory of Your Hazardous Materials

Start by identifying every hazardous material at your facility. Record what it is, how much you have, and where you store it. This inventory is the foundation for everything else.

2. Build Your Plan

Your HMBP includes several parts:

• Facility information
• A hazardous materials inventory
• A site map
• An emergency response plan
• An employee training program

Together, these pieces give responders a clear picture of your site and show how your team will act in an emergency.

A quick note on CERS. CERS covers more than the HMBP Program. Your submission may also include information for other programs. These include Regulated Substances (which use a different definition), the Aboveground Petroleum Storage Act (APSA), and Underground Storage Tanks (USTs). These programs are separate from HMBP, though you’ll usually submit them together. We won’t cover them in this guide, but our team is happy to answer your questions.

3. Submit Your Plan Through CERS

You’ll submit your HMBP electronically through CERS. New facilities generally have 30 days to submit after bringing reportable materials on site.

4. Certify or Resubmit Every Year

Every regulated facility has an annual HMBP task. The statewide deadline is March 1. What you need to do depends on your facility:

• If your facility is subject to EPCRA or one of the programs listed above, you must submit a complete HMBP every year.
• If your facility isn’t subject to EPCRA or one of the programs listed above, you can certify your plan each year if nothing has changed. You’ll still need to review and submit a full plan at least once every three years.

Certifying means you confirm in CERS that your information is still complete and accurate. Take this step seriously. If your inventory changed and you certify anyway, you’ve certified bad data.

Some CUPAs set their own submission windows. Check with your local agency so you don’t miss a local deadline.

5. Update Your Plan Within 30 Days of a Change

You don’t have to wait for your annual deadline to report certain changes. You must update your HMBP within 30 days if:

• The quantity of a material you’ve already reported increases by 100% or more.
• You start handling a new reportable material.
• Your business address, ownership, or name changes.
• Your operations change in a way that affects any part of your plan. For example, if an emergency contact changes, you’ll need to update your plan.

6. Train Your Team

Employees who handle hazardous materials or respond to emergencies need ongoing training. Keep records of who you trained and when. Inspectors will likely ask to see them.

7. Prepare for Inspections

CUPAs inspect regulated facilities on a regular basis. Inspectors compare what’s in your HMBP to what’s actually on site. An accurate, current plan makes inspections smoother and less stressful.

What’s Changed in Recent Years?

If you haven’t looked closely at your HMBP program in a while, a few updates are worth knowing.

The retail exemption got narrower. AB 2059 took effect on January 1, 2023. It tightened the definition of a “consumer product.” That change brought more materials into the HMBP Program.

Now, some consumer products sold at retail must be reported. This applies to products with an NFPA or HMIS hazard rating of 3 or 4 when a store has at least:

• 1,500 pounds of a solid
• 165 gallons of a liquid
• 600 cubic feet of a compressed gas

Propane is a good example. A store that sells propane may need to report once it has about four 20-pound barbecue cylinders on hand.

CalEPA now leads the program. CalEPA took over the HMBP Program from Cal OES. In March 2024, CalEPA also moved the program’s regulations into a new section of Title 19. The requirements themselves didn’t change, but the section numbers did. If your internal procedures cite old regulation numbers, it’s a good time to update them.

More amendments took effect in 2024. AB 1716 amended parts of the law covering plan contents and exemptions, effective January 1, 2024. Your CUPA can tell you how these changes apply locally.

Common HMBP Compliance Challenges

Each step above sounds simple on paper. In practice, it takes time, coordination, and attention to detail. Here are the challenges we see most often.

• Keeping up with regulatory changes. As the last section shows, the rules keep evolving. Staying current takes ongoing effort.
• Maintaining an accurate inventory. Tracking materials gets hard when you handle many chemicals or your inventory shifts often. Small gaps can add up to big problems. A management of change (MOC) process can help. It flags new reportable materials before they arrive on site.
• Keeping the plan complete and current. Your plan has many moving parts. Updating each one on time takes real work, especially for busy teams.
• Training a changing workforce. Turnover, tight schedules, and limited resources can make training hard to keep up with.
• Navigating local differences. Each CUPA can interpret and enforce the rules a little differently. If you manage facilities across multiple jurisdictions, those differences multiply.

These challenges are real. But they don’t change your obligation to comply. The good news is that they’re all solvable with the right approach.

How to Make HMBP Compliance Easier

Here are a few practical steps to lighten the load:

• Assign clear ownership. Name a person or team responsible for tracking regulatory changes and keeping plans up to date.
• Centralize your data. Use software to track your hazardous materials inventory and keep records in one place.
• Plan for the annual cycle. Build your March 1 deadline, and any local deadlines, into your calendar well ahead of time.
• Track training. Set up a simple system to schedule, complete, and document employee training.
• Talk to your CUPA. Your local agency is a valuable resource. Ask questions early, especially if you operate in more than one jurisdiction.
• Bring in expert support. A partner who knows the HMBP Program can help you spot gaps and stay ahead of changes.

Are There Exemptions to the HMBP Program?

Yes. Now that you know how broadly the program defines a hazardous material, here’s what may fall outside it. California law exempts certain materials and businesses from some or all HMBP requirements. Common exemptions include:

• Consumer products at retail. Hazardous materials contained only in consumer products sold at a retail store may be exempt. This exemption doesn’t apply at the facility that makes the product, at a separate warehouse or distribution center, or where products are dispensed on site. Remember that AB 2059 narrowed this exemption for higher-hazard products.
• Lubricating oil. Facilities with no more than 55 gallons of each type of lubricating oil, and no more than 275 gallons total, may be exempt. Used oil doesn’t qualify.
• Propane for on-site use. Up to 500 gallons of propane used only for cooking, heating work areas, and heating water may be exempt.
• Fuel in vehicles. Fuel in the tanks of vehicles or motorized equipment is exempt.
• Treated wood. Treated wood and treated wood waste are generally exempt, unless the facility must file federal EPCRA inventory reports.
• Medical gases. Physicians, dentists, veterinarians, pharmacists, and similar providers may be exempt if they store less than 1,000 cubic feet each of oxygen, nitrogen, or nitrous oxide.
• Farms (partial). Farms may be exempt from the emergency response plan section of the HMBP if they meet certain conditions, such as posting signs and training employees.

Keep in mind that your CUPA can require a plan even when an exemption would otherwise apply. It can do this if it finds a public health, safety, or environmental concern. Always check with your local CUPA to confirm whether an exemption fits your facility.

Moving Forward With Confidence

California’s HMBP Program protects the people who live and work near your facilities. It also protects the first responders who show up when something goes wrong.

Compliance takes effort. But when you understand the requirements, stay on top of changes, and build a steady annual rhythm, it becomes much more manageable. And you don’t have to navigate it alone.

Encamp combines easy-to-use software with expert support to help you manage HMBP compliance across every facility and every CUPA. Talk to our team to learn how Encamp can help.

 

Last Updated: September, 2026