Definition
CEQA — the California Environmental Quality Act (Public Resources Code §§ 21000–21189.5) — is California's foundational environmental review law. Enacted in 1970 and signed by Governor Ronald Reagan, CEQA requires all state and local government agencies to evaluate the environmental effects of their decisions before approving projects — and to disclose those effects to the public and decision-makers.
CEQA is often described as a "full disclosure" law: it doesn't prohibit environmental harm, but it requires agencies to understand and disclose potential impacts before acting, consider alternatives that might reduce harm, and adopt feasible mitigation measures. An agency may approve a project with significant unmitigated environmental effects if it makes a "statement of overriding considerations" — a formal finding that the project's economic, social, or other benefits outweigh its environmental costs.
What Triggers CEQA
CEQA applies whenever a public agency undertakes or approves a "project" — and a "project" is defined broadly. In a 1972 landmark decision, Friends of Mammoth v. Board of Supervisors, the California Supreme Court held that CEQA applies not just to government-initiated activities but to any privately-initiated project that requires a discretionary approval from a government agency. That decision was subsequently codified by the Legislature and remains controlling law.
The key trigger word is "discretionary." A discretionary approval — one that requires the agency to exercise judgment about whether and how to approve a project — triggers CEQA. A ministerial approval — one where the agency simply checks whether a project meets objective criteria with no room for judgment — does not trigger CEQA. This distinction is why California's recent housing laws, which require ministerial approval for qualifying projects, simultaneously exempt those projects from CEQA review.
The Three Tiers of CEQA Review
Not every project requires the same level of CEQA review. The law creates a tiered framework:
- Exemptions: Projects that are categorically exempt (based on project type) or statutorily exempt (based on express legislative exemption) require no CEQA documentation. Most routine city operations — permit issuance for minor projects, minor alterations to existing facilities, small residential additions — qualify for categorical exemptions.
- Negative Declaration / Mitigated Negative Declaration (MND): A shorter review document used when a project would not have significant environmental effects, or when all potentially significant effects can be mitigated to less-than-significant levels with specified conditions.
- Environmental Impact Report (EIR): The full environmental review document required when a project may have one or more significant impacts that cannot be fully mitigated. EIRs must analyze impacts, alternatives, and mitigation, and are subject to public comment and the most intensive judicial scrutiny.
CEQA Timeline and the Notice of Determination
One of the most practically important CEQA compliance requirements is the Notice of Determination (NOD) — or, for exempt projects, the Notice of Exemption (NOE). After a project is approved:
- The lead agency must file a NOD (or NOE) with the County Clerk and the State Clearinghouse within a short window — typically 5 days for NOEs under AB 130's 2025 amendments.
- Filing the NOD or NOE starts the statute of limitations clock for CEQA challenges — 30 days from filing for most EIR projects, 35 days for negative declarations, and 35 days for NOEs.
- If the agency fails to file the notice, the statute of limitations is 180 days — giving CEQA challengers a much longer window to sue.
CEQA compliance is one of the highest-stakes procedural obligations in California local government law. A missed notice, an inadequate EIR, or an unjustified exemption can void a project approval years after construction has begun. Legislaide helps agencies identify CEQA compliance risks in their approval processes before they become litigation.
Frequently Asked Questions
What is CEQA?
CEQA — the California Environmental Quality Act (Public Resources Code §§ 21000–21189.5) — requires state and local agencies to evaluate the environmental effects of their discretionary decisions before approving projects, and to disclose those effects to the public and decision-makers.
What triggers CEQA review?
CEQA applies to any "project" requiring a discretionary approval from a public agency. Ministerial approvals — where the agency checks objective criteria with no room for judgment — do not trigger CEQA. This is why California's shift to ministerial housing approvals also eliminates CEQA review for those projects.
What are the three tiers of CEQA review?
(1) Exemptions — no CEQA document required; (2) Negative Declaration or Mitigated Negative Declaration — for projects with no significant or fully mitigable impacts; (3) Environmental Impact Report (EIR) — required when the project may have one or more significant, unmitigable environmental effects.
What are categorical exemptions?
Categorical exemptions are classes of projects the state has determined generally do not have significant environmental effects — such as minor alterations to existing facilities (Class 1) or small new construction (Class 3). If a project fits an exemption class and no exception applies, no CEQA documentation is required.
What happens if an agency skips required CEQA review?
If an agency approves a project without required CEQA review, the approval can be voided by a court via writ of mandate. The agency must complete CEQA before re-approving the project. Attorney fees may be awarded to the successful challenger, and the project faces months or years of additional delay.
Published April 15, 2026 by Legal Team at Legislaide.