In Sunflower Alliance v. Department of Conservation (2026) (Cal., June 25, 2026, No. S287414), the California Supreme Court clarified that the Class 1 categorical exemption turns on the extent of change in an existing facility’s use—not on whether the change poses only negligible environmental risk. The Court reversed the First District Court of Appeal’s broader reading and held that an agency must evaluate the nature and scope of the proposed expansion of use itself.
Key Takeaways
- New uses are not automatically excluded. The Class 1 exemption’s use of “expansion” includes changes in the degree and nature of the use, as well as additional uses.
- Environmental risk is not the test. A project does not qualify for the Class 1 exemption merely because the proposed change is expected to cause little or no environmental harm.
- Agencies should focus on the proposed expansion’s nature, scope, and functionality. The key question is whether the project materially changes the nature, scope, or functionality of the existing facility’s existing or former use.
Background
Real Party in Interest (Real Party) held a leasehold in the Brentwood Oil Field in Contra Costa County. In 2020, Real Party applied to the California Department of Conservation’s Geologic and Energy Management Division (CalGEM) to convert a dormant oil-and-gas extraction well into an injection well for treated wastewater.
CalGEM approved the project and issued a Notice of Exemption, concluding that the well conversion qualified for the Class 1 exemption as a minor alteration of an existing facility involving negligible expansion of former use.
Petitioner Sunflower Alliance (Petitioner) challenged the exemption determination. The trial court agreed, finding that injecting water was a significantly different use from pumping oil and gas. The Court of Appeal, in Sunflower Alliance v. Department of Conservation (2024) 105 Cal.App.5th 771, reasoning that any expansion of use was negligible because the environmental risks of the conversion were negligible. The Supreme Court granted review to consider whether “negligible” refers to a negligible change in the use or to a change that presents only negligible environmental risk.
Supreme Court Decision
New Uses
The Court rejected Petitioner’s argument that the Class 1 exemption categorically excludes new uses. The Court explained that because “expansion” can include changes in the scope or nature of use, the exemption may apply to a new or additional use where the expansion of the existing facility’s use is itself negligible. The Court pointed to the Class 1 examples—such as adding bicycle lanes to an existing street, converting a single-family residence to office use, and using a residence as a small family daycare—as examples of changes that do not substantially expand the existing facility’s use.
“Negligible or No Expansion”
The Court also rejected Real Party’s argument that Class 1 applies whenever the environmental risk from a change in use is negligible. The phrase “negligible or no expansion of existing or former use” refers to the change in the nature or degree of a facility’s use, not the risk of environmental harm caused by that change.
That distinction mattered to the Court. It explained that the Class 1 exemption does not mention environmental risk—and that reading that concept into the exemption would expand the categorical exemption beyond its text. Shift the Secretary of the Natural Resources Agency’s role to lead agencies and courts, and require a premature “mini-CEQA” review at the exemption stage.
The Court likewise rejected Real Party’s three main counterarguments. First, CEQA’s environmental protection purpose does not permit courts to expand a categorical exemption beyond its regulatory language. Second, although the Class 1 examples generally involve low environmental risk, low risk is common to all categorical exemptions and is not enough by itself to establish that a project fits within Class 1. Third, the unusual-circumstances exception does not make environmental effects part of the threshold Class 1 inquiry; that exception applies only after the agency first determines that unusual circumstances exist.
Project Conditions
The Court did not reach the issue of whether a lead agency may impose project conditions related to environmental effects while also declaring a project exempt from CEQA, but it did indicate that such a determination would be fact-specific based on the record.
Concurring Opinion
Justice Kruger’s concurrence agreed with the majority but emphasized that the opinion leaves open an important question: how agencies and courts should decide whether an expansion of use is “negligible.” Justice Kruger explained that the examples in CEQA Guidelines section 15301 provide the benchmark. If a project resembles one of those examples, the exemption applies. If not, the examples can still guide whether the proposed change is small enough that formal environmental review is unnecessary.