Buying or Selling a California Facility: The EH&S Due-Diligence Side
By the time the term sheet is signed, the buy-side team usually has the financials, the lease abstract, and a Phase 1 Environmental Site Assessment on the table. What’s still missing in most California industrial deals is the operational compliance picture: whether the facility being bought (or sold) can keep operating in California on day one without a regulator showing up to ask questions the new owner can’t answer.
By the time the term sheet is signed, the buy-side team usually has the financials, the lease abstract, and a Phase 1 Environmental Site Assessment on the table. What’s still missing in most California industrial deals is the operational compliance picture: whether the facility being bought (or sold) can keep operating in California on day one without a regulator showing up to ask questions the new owner can’t answer.
That is the EH&S side of due diligence. It’s separate from the Phase 1, separate from the legal review, and almost always a blind spot for buyers who haven’t acquired a California facility before. For the operational, programs-and-permits view of due diligence in depth, see our companion guide on environmental due diligence for business acquisitions in California. This piece is the facility-changes lens: what shifts when an acquisition is in motion, and how the EH&S picture shapes both the deal and the first ninety days after closing.
For the full lifecycle context (opening, transferring, closing), see our facility changes in California guide.
What the Phase 1 Covers (and What It Doesn’t)
A Phase 1 ESA, performed under ASTM E1527-21, looks at the property. Historical land use, regulatory database hits, recognized environmental conditions, the chance that contamination is present in the soil or groundwater. Lenders typically require it. Real estate brokers are familiar with it. It is a property-side assessment.
It does not look at the business operating on the property. A clean Phase 1 says nothing about whether the seller’s Hazardous Materials Business Plan was filed in CERS (the state’s online environmental reporting portal) under the right business name, whether the local CUPA (Certified Unified Program Agency, the local agency that administers hazardous materials, hazardous waste, and underground storage tank programs in California; depending on the jurisdiction, the CUPA may be a county environmental health department, a fire department, or another designated local agency) has open violations at the site, whether the EPA ID is active and matches the entity that’s actually generating waste, or whether the Cal/OSHA programs (IIPP, lockout/tagout, hazard communication) exist on paper and in practice.
Those are the things that decide whether the new owner inherits a compliant facility or a list of deficiencies the regulators will eventually find.
The EH&S Diligence Checklist
A serviceable EH&S diligence package on a California industrial facility pulls together the documents below and answers the questions next to each one. Buyers should ask for these during diligence. Sellers should have these ready before the buyer asks.
| Diligence Area | Documents to Request | Questions to Answer |
|---|---|---|
| Transaction structure | Letter of intent or term sheet | Stock purchase or asset purchase? Will the legal entity, EIN, and W9 change at close? |
| Permit & registration inventory | EPA ID record, CERS submittals, air permits, stormwater coverage (Notice of Intent or No Exposure Certification under the Industrial General Permit), wastewater discharge permit, fire permits, DOT registration if applicable | Is every active permit accounted for, and is each one held by the entity that’s actually operating the facility? |
| CERS / HMBP filing status | Latest HMBP, CERS submittal history, business owner/operator/parent corporation listings | Is the HMBP current? Does the chemical inventory match what’s on the floor today? Note: CERS updates for changes in business owner, operator, or parent corporation must be made within 30 days (H&SC 25508.1). |
| Hazardous waste profile | EPA ID generator status, last 3 years of manifests, biennial report (if LQG), waste minimization plan (SB 14) if applicable | What generator tier is the facility? Are manifests being signed by the correct entity? |
| Open enforcement | Notices of violation, agency correspondence, inspection reports from the CUPA, DTSC (the Department of Toxic Substances Control), Cal/OSHA, Air District, Regional Water Board | Are there open NOVs, pending settlements, or unaddressed correction orders? |
| Cal/OSHA program status | IIPP (Injury and Illness Prevention Program), written programs (lockout/tagout, hazard communication, respiratory, hearing, confined space if applicable), training records, EMR (Experience Modification Rate) history | Are the required programs in place, signed, dated, and actually trained? |
| Tank & containment | SPCC plan (if AST oil storage triggers it), APSA records, tank inspection records, secondary containment status | Are tanks, piping, and containment current under California APSA / federal SPCC? |
| Tiered permit treatment units | Conditionally Authorized, Permit-by-Rule, or Conditionally Exempt tiered permit records; closure cost estimate; financial assurance documentation | Are any treatment units active under tiered permitting? What would it take to close one if the buyer wants it out? |
| Closure obligations on the table | Lease end date, any planned relocation or consolidation, equipment to be decommissioned | If the deal triggers a move or a unit closure, what’s the regulatory timeline? |
The list is long because California’s regulatory framework is layered. A facility can be in good shape with the CUPA and still have a missing SMARTS filing with the State Water Board, or a current air permit and an inactive EPA ID. The diligence checklist exists so nothing falls between the agencies.
How Findings Translate to the Deal
Diligence findings don’t usually kill deals. They reprice them or restructure them. A typical pattern:
- Programs missing or out of date become a budgeted line item for the buyer’s first-year compliance work. The buyer knows what to plan for; the seller knows what to negotiate around.
- Open NOVs and pending enforcement stay with the facility. They don’t disappear at closing. Buyers either resolve them before close (seller’s expense), hold escrow against them, or accept them with a price adjustment.
- Stale CERS, EPA ID, or air permit records under the wrong entity become a permit-transfer scope for the new owner. The mechanics live in our ownership change compliance guide; the work itself is straightforward, but it has to be sequenced into the first ninety days.
- A closure obligation embedded in the deal (the seller is consolidating, the buyer is relocating production, a treatment unit is being decommissioned) brings closure-plan scope onto the post-close calendar. See California facility closure plans and tiered permit unit closure certification for what those processes involve.
The diligence report is what makes those line items visible early enough to negotiate, rather than discovered six months after closing when a CUPA inspector walks in.
The Seller Side
Sellers benefit from running a compliance assessment before the buyer’s consultant arrives, not after. The reason is control of the narrative. A seller who has the HMBP current, the IIPP signed and dated, training documented, the EPA ID active under the right name, and any open NOVs already in correction has a clean file. Gaps that surface from the buyer’s side become leverage on price; gaps the seller surfaces and addresses are just due diligence working as intended.
When we walk a facility on the seller side, the first thing we check is whether the business name on the CERS account, the EPA ID, the air permit, and the stormwater coverage all match the entity that’s actually paying the bills. The most common pattern we see is a facility that filed everything correctly years ago, changed parent companies somewhere along the way, and never updated the regulatory side. The chemicals are right, the operations are right, but the entity on every permit is wrong. A buyer’s consultant will catch that within an hour.
The other common pattern, on both sides: a fume hood or a small treatment unit that hasn’t been used in three years but still sits on the tiered permit. Closing it formally before the deal is cleaner than handing the buyer a future closure project they didn’t price in.
What CDMS Does on These Engagements
We come to the facility. We pull the regulatory portals (CERS, RCRAInfo, SMARTS, the local air district account). We walk the site with whoever knows the operations. We deliver a written assessment organized by regulatory program: what’s in place, what’s missing, what the agency would say if they walked in tomorrow. The report works for the buyer’s deal team and for the facility’s operations team after closing, because the findings are specific enough to act on. Pricing is fixed, based on the facility profile and the transaction timeline.
For the broader operational compliance assessment scope (the buy-side complement to the Phase 1), see our environmental due diligence service page. For seller-side preparation specifically, see preparing a facility for sale.
Buying a site you plan to expand? Permits and timeline for opening a new California facility →
Trusted throughout California
BSY started working with CDMS last year after our in-house EHS person departed the company. CDMS reviewed our existing operational permits as well as any additional Federal, State and Local regulations that could apply and helped us to create a comprehensive compliance calendar to track regulatory deadlines and submittal due dates. The CDMS team does an excellent job of tracking everything and can be relied upon to complete the forms accurately and assist with submittals, allowing me to focus on our business.
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