HMBP for New California Facilities: When and How to Get Started

If you’re opening a new facility in California and you handle hazardous materials, the Hazardous Materials Business Plan (HMBP) is one of the first regulatory filings you need to think about. Not after you open. Before.

This is the question we get most often from new operators: “We’re almost ready to start operations, but someone said we need an HMBP. What does that mean, and when does the clock start?”

This piece walks through when the HMBP requirement begins for a new California facility, what you need before your first CERS submittal, and how the site visit fits with everything else that may apply. For the full program overview, see our Hazardous Materials Business Plan (HMBP) and CERS submittal services guide.

When the Requirement Begins

California’s HMBP rules sit in Health and Safety Code Chapter 6.95 (Section 25500 et seq.). They apply when a facility stores or handles a hazardous material at or above the reporting thresholds:

• 55 gallons of a liquid
• 500 pounds of a solid
• 200 cubic feet of compressed gas
• Any amount of an extremely hazardous substance above its threshold planning quantity

If your new facility will cross any of these limits, you need an HMBP. Start the process before operations begin. Under HSC 25508, a facility is not deemed in violation until 30 days after it becomes subject to the requirement, but in practice many CUPAs and cities expect the plan completed before occupancy, business licensing, or before hazardous materials are brought on site. The plan is filed through CERS (the California Environmental Reporting System, the state’s online reporting portal).

Some cities have moved that deadline forward in practice. Moreno Valley, for example, now requires a completed HMBP before it will issue a business license. Operators with multi-site portfolios tell us they expect more California cities to follow. If your project is going through plan check or business license review, ask your building department whether HMBP completion is a condition of permit or license issuance. It often is.

For a full breakdown of who must file, see our guide to California HMBP reporting thresholds and applicability.

What Trigger You’re Probably Responding To

New facility HMBP work usually comes in through one of four doors:

1. The fire department or building department raised it during plan review or a pre-occupancy walkthrough.
2. The city or county made it a condition of business license issuance.
3. The local CUPA (Certified Unified Program Agency, which may be a county environmental health department, fire department, or another local agency depending on jurisdiction) sent a letter after spotting a new tenant or new business filing.
4. You already know the requirement from a prior facility and you’re getting ahead of it.

Whichever door applies, the inputs are similar. What changes is how much time you have.

Step-by-Step: From Opening a Facility to HMBP Compliant

Some of these steps can run in parallel. We usually pull SDSs while the CERS account is being set up. But the sequence matters. The CERS account must exist before anything is uploaded. The EPA ID number must be in place before hazardous waste is shipped or manifested.

What to Have Ready Before You Call

A first call goes faster when you can describe these things:

• A draft chemical list with approximate maximum quantities and physical state
• The facility address and what activities will happen there
• Whether the operation will generate hazardous waste (and roughly how much)
• A floor plan or CAD drawing if one exists
• Any letters or emails you’ve received from the fire department, building department, or CUPA

If you don’t have all of this, that’s fine. We get this question often: “I’m not even sure if my materials qualify.” The first part of the call is usually working through your chemical list and confirming which items trigger reporting.

EPA ID Numbers and Why Timing Matters

If your facility will generate any hazardous waste, even one drum a quarter, you need an EPA ID number issued by California’s Department of Toxic Substances Control (DTSC). The ID number should be obtained early and must be in place before hazardous waste is shipped or manifested to a recycler or disposal facility. The application goes in on EPA Form 8700-12. New California operators often miss this. The HMBP and the EPA ID are separate filings handled by separate sections of CERS, but you need both, and the EPA ID typically needs to be in hand before your first waste pickup so the manifest can be signed correctly.

When we set up a new facility, the EPA ID application uses the same data collection that feeds the HMBP. Same chemicals, same operator information, mostly the same paperwork.

What the Site Visit Usually Surfaces

A new facility site visit is rarely just about hazardous materials inventory. When we walk a site for the first HMBP, we usually find at least one additional compliance program that no one has flagged yet. The common ones:

• Injury and Illness Prevention Program (IIPP): required for every California employer under Cal/OSHA Title 8, Section 3203, including new facilities on day one
• Stormwater compliance: for industrial operations under the California Industrial General Permit, a Notice of Intent or No Exposure Certification may apply
• Air permits: if you have equipment that emits pollutants (spray booths, boilers, generators, ovens), your local air district likely requires a permit before installation or operation
• Hazardous waste management: accumulation areas, weekly inspections, employee training, and waste manifests all kick in once you generate waste
• Tank programs: aboveground or underground storage tanks bring their own requirements (APSA, UST) on top of HMBP inventory reporting

Operators sometimes ask us to focus on HMBP and HMBP only. We can do that. But we usually mention what else we noticed so it doesn’t surprise you during an inspection two months later. Finding it now is cheaper than finding it after a notice of violation.

How CDMS Handles New Facility Setups

We follow the same pattern regardless of facility type:

1. Initial call. We confirm the trigger (fire department letter, building permit, business license requirement, voluntary), get a rough chemical count, and identify the CUPA.
2. Data collection. We send a document request listing the SDSs, drawings, and operator information we need. If you don’t have something, we tell you how to get it.
3. Site visit. Our consultant walks the facility, verifies the inventory, photographs storage areas, and notes anything else that may apply.
4. CERS account setup and submittal. We register the facility in CERS, populate the inventory, upload the site map and emergency response plan, and prepare the business activities form.
5. Client certification. You log into CERS and certify the submittal. We confirm acceptance from the CUPA.
6. Plan delivery. You receive the completed HMBP and confirmation of the CERS filing.

For new facilities, we provide a timeline with the quote. The driver is usually how quickly we can collect SDSs and schedule the site visit, not the CERS upload itself.