Commercial Environmental Hazards Guide
A due-diligence overview for buyers, sellers, and lessees of commercial property in California — environmental site assessments, cleanup liability, and material disclosure obligations.
Environmental Site Assessments
Environmental due diligence on commercial property is typically structured in phases. Completing appropriate inquiry is also how a buyer preserves innocent-landowner and bona-fide-prospective-purchaser defenses under federal law.
| Assessment | Purpose | Typical Trigger |
|---|---|---|
| Phase I ESA | Records review, site inspection, and interviews to identify recognized environmental conditions (RECs) | Standard for most commercial acquisitions and financing |
| Phase II ESA | Sampling of soil, groundwater, and building materials to confirm contamination | When Phase I identifies RECs |
| Remediation / cleanup | Removal or containment of contamination under agency oversight | When Phase II confirms hazards above screening levels |
Common Commercial Hazards
- Underground storage tanks (USTs) and past fuel or solvent storage.
- Soil and groundwater contamination from prior industrial, dry-cleaning, or automotive uses.
- Asbestos-containing materials and lead-based paint in older buildings.
- Hazardous materials and waste stored or generated on site.
- Mold and indoor air quality issues affecting tenants.
Cleanup Liability
Under the federal Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) and California's analogous laws, current and former owners and operators can be held strictly, jointly, and severally liable for cleanup — regardless of fault. Appropriate pre-purchase inquiry (a compliant Phase I ESA) is essential to establishing statutory liability defenses.
Disclosure Obligations
- California Health & Safety Code §25359.7 requires an owner who knows of a release of hazardous substances on the property to disclose it to a buyer or lessee.
- Proposition 65 (Health & Safety Code §25249.5 et seq.) may require warnings about exposure to listed chemicals.
- Known material environmental conditions should be disclosed to avoid fraud and misrepresentation claims.
Bottom Line
Commercial environmental liability is strict and can vastly exceed the value of the property. A Phase I ESA is the standard first step; sellers must disclose known releases, and buyers should complete appropriate inquiry before closing.