The California Environmental Quality Act, known as CEQA, is a 1970 state law that requires every California state and local agency to identify, disclose, and where feasible reduce the environmental effects of projects before approving them. It is the state counterpart to the federal National Environmental Policy Act, and it applies far beyond obvious government construction: any private development that needs a discretionary permit can trigger it. CEQA does not, by itself, block projects that would harm the environment. It forces agencies to study the harm, tell the public about it, and explain the trade-offs on the record.
What CEQA Covers
Public Resources Code Section 21065 defines a “project” as any activity that may cause a direct or reasonably foreseeable indirect physical change in the environment and falls into one of three buckets: work carried out by a public agency, private activity supported by public funding, or private activity that needs a government-issued permit, license, or entitlement.1California Legislative Information. California Public Resources Code PRC 21065 One lead agency runs the environmental review and serves as the primary decision-maker.
The line that matters most is discretion. A discretionary project is one where the agency decides whether and how to approve, weighing factors beyond a checklist. A ministerial project applies fixed, objective standards with no room for judgment. A standard building permit issued against preset code requirements is the classic ministerial action, and CEQA does not apply to it.2Governor’s Office of Land Use and Climate Innovation. Site Check and Other CEQA Housing Resources – Section: By-Right/Ministerial Considerations If the agency has any discretion over the outcome, CEQA is in play.
Exemptions
Even discretionary projects can bypass full review if they fit an exemption. There are two main categories.
Statutory exemptions are written directly into the Public Resources Code by the Legislature. They cover activities like emergency repairs to public infrastructure and situations where the agency has no meaningful discretion.
Categorical exemptions cover 33 classes of projects that the Secretary for Natural Resources has determined do not normally produce significant environmental effects. The classes appear in CEQA Guidelines Sections 15301 through 15333 and include minor additions to existing buildings, small land alterations, in-fill development, and habitat restoration.3Legal Information Institute. California Code of Regulations Title 14 Section 15300 – Categorical Exemptions They come with limits. A categorical exemption cannot be used where the project would affect an environmental resource of hazardous or critical concern, where several small projects in the same area would combine into a larger impact, or where the site sits on a list of hazardous waste facilities.
When an agency relies on an exemption, it may file a Notice of Exemption with the county clerk after approving the project. Filing starts a 35-day window to sue. Without a filed notice, the challenge window runs 180 days.4California Legislative Information. California Public Resources Code PRC 21167 Filing is optional but valuable.
Housing Streamlining
California has increasingly carved out expedited pathways for housing. Senate Bill 35 created a ministerial approval process for qualifying multifamily and mixed-use developments on infill sites that include a share of affordable units, removing them from CEQA review entirely. In 2025, Governor Newsom signed additional reforms that further streamlined CEQA for infill housing, infrastructure projects, farmworker housing, and local rezoning done to implement approved housing elements.5Office of the Governor. Governor Newsom Signs Into Law Groundbreaking Reforms to Build More Housing Affordability These streamlining laws typically come with labor requirements like prevailing wages and restrictions on demolishing existing affordable housing.
The Initial Study and Its Three Outcomes
For a project that needs review, the lead agency conducts an initial study to figure out whether the project could cause significant environmental harm. The agency works through a standardized checklist, Appendix G of the CEQA Guidelines, covering roughly 20 topic areas including air quality, biological resources, cultural resources, noise, transportation, and wildfire risk. For each topic the agency decides whether the impact would be potentially significant, less than significant with mitigation, less than significant, or nonexistent.
Three paths follow from that study.
A negative declaration is prepared when the initial study finds no substantial evidence of any significant environmental effect. The project can proceed after a public review period.6Caltrans. Chapter 35 – Initial Study and Negative Declaration – Section: Definition and Purpose of an Initial Study
A mitigated negative declaration is prepared when the study finds potentially significant effects but the applicant agrees to specific changes that reduce every one of those effects below the significance threshold.6Caltrans. Chapter 35 – Initial Study and Negative Declaration – Section: Definition and Purpose of an Initial Study Most routine development projects land here. If even one significant impact cannot be adequately mitigated, the project needs a full environmental impact report.
An environmental impact report is required when the project may cause significant effects that mitigation cannot fully resolve.
What Goes Into an Environmental Impact Report
The EIR is the most rigorous level of CEQA analysis and the one that generates the most litigation. It is not a decision document. It is an informational tool that lays out the environmental costs of the project so the public and decision-makers can weigh them against the benefits.
The process starts with a Notice of Preparation sent to the Office of Planning and Research, every responsible and trustee agency, and any federal agency involved in the project. The notice includes a project description, location, and a summary of the probable environmental effects.7Legal Information Institute. California Code of Regulations Title 14 Section 15082 – Notice of Preparation and Determination of Scope of EIR For projects of statewide, regional, or areawide significance, the lead agency must hold at least one public scoping meeting.
The draft EIR then describes the existing environmental setting, the proposed project, and every significant effect the project is expected to cause, including direct impacts, indirect effects, and long-term consequences. Where an impact would be significant, the EIR must propose enforceable mitigation measures that become binding through permit conditions or legal agreements.
Every EIR must evaluate a reasonable range of alternatives, including a “no project” alternative that describes what would happen if the project were not approved. The alternatives discussion focuses on options that could avoid or substantially reduce the project’s significant effects, even if those alternatives cost more or do not fully achieve the applicant’s goals.8Legal Information Institute. California Code of Regulations Title 14 Section 15126.6 – Consideration and Discussion of Alternatives to the Proposed Project The agency does not have to evaluate every conceivable option.
An EIR must also analyze cumulative impacts, meaning the way a project’s effects combine with those of other past, present, and reasonably foreseeable future projects to create a larger problem.9Legal Information Institute. California Code of Regulations Title 14 Section 15130 – Discussion of Cumulative Impacts This requirement prevents a series of individually minor projects from producing large-scale harm that no single review would catch.
Tribal Consultation Under AB 52
Assembly Bill 52, codified at Public Resources Code Section 21080.3.1, added a formal consultation requirement for projects that could affect tribal cultural resources. The process applies whenever an agency prepares a negative declaration, mitigated negative declaration, or EIR. Within 14 days of determining that a project application is complete, the lead agency must send written notice to any California Native American tribe that has previously requested notification for projects in its area of traditional or cultural affiliation. The tribe has 30 days to request consultation.10Governor’s Office of Land Use and Climate Innovation. Tribal Consultation Checklist
If a tribe requests consultation, the agency must begin the process within 30 days. Consultation continues until the parties reach an agreement on how to preserve or mitigate impacts, or until both sides conclude in good faith that agreement is not possible. Tribal cultural resources include sites, features, places, cultural landscapes, and objects with cultural value to a tribe that are either listed on or eligible for the California Register of Historical Resources, listed on a local register, or determined by the lead agency to be significant. Skipping or rushing this consultation is one of the more common grounds for successful CEQA challenges.
How Transportation and Greenhouse Gas Impacts Are Measured
Since July 2020, CEQA has required agencies to measure transportation impacts using vehicle miles traveled rather than the older level-of-service metric, which measured congestion at intersections. Under SB 743, automobile delay measured by congestion is no longer considered a significant environmental impact under CEQA.11Governor’s Office of Land Use and Climate Innovation. SB 743 Frequently Asked Questions Agencies may still use level-of-service for local traffic planning, but VMT is what counts for CEQA.
For greenhouse gases, the CEQA Guidelines do not set a single statewide numeric threshold. Each lead agency must make a good-faith effort to describe, calculate, or estimate the project’s emissions using scientific and factual data, choosing its own methodology.12California Department of Conservation. 2026 CEQA Statutes and Guidelines In deciding significance, the agency considers whether emissions exceed an applicable local or regional threshold and whether the project complies with adopted climate plans or statewide reduction targets. Some air quality management districts publish their own numeric thresholds, which lead agencies in those regions commonly use.
Public Review Periods
Every CEQA environmental document goes through a public review period before the agency acts on it. The length depends on the document type:
- Negative declarations and mitigated negative declarations get a minimum 20-day review, or 30 days if the document is submitted to the State Clearinghouse for review by state agencies.13Legal Information Institute. California Code of Regulations Title 14 Section 15105 – Public Review Period for a Draft EIR
- Draft EIRs get a minimum 30-day review, extended to 45 days when submitted to the State Clearinghouse, with a maximum of 60 days absent unusual circumstances.14Governor’s Office of Land Use and Climate Innovation. CEQA 101 – Section: Step 3 Appropriate Level of Review
The lead agency must evaluate every substantive comment and provide written responses. For EIRs, those responses go into a final EIR that the decision-making body reviews before acting. Vague comments about a project being “bad for the environment” do not require detailed responses; comments that identify specific analytical gaps or challenge the sufficiency of mitigation do. Ignoring a well-supported comment is one of the easiest ways to lose a CEQA lawsuit.
Approving the Project
Before approving a project that required an EIR, the lead agency must formally certify the document. Certification requires findings that the final EIR was completed in compliance with CEQA, that decision-makers reviewed and considered it before approval, and that the EIR reflects the agency’s independent judgment. An agency that certifies a clearly deficient EIR invites litigation.
When a project is approved with either a mitigated negative declaration or an EIR that includes mitigation, the lead agency must adopt a Mitigation Monitoring and Reporting Program. The MMRP ensures every mitigation measure imposed as a condition of approval is actually carried out during construction and operation. Each measure must be fully enforceable through permit conditions, agreements, or other legal mechanisms.15State Water Resources Control Board. Appendix J – Mitigation Monitoring and Reporting Program A mitigation measure that lives only on paper does not satisfy CEQA.
Sometimes a project will cause significant effects that no feasible mitigation can reduce. CEQA does not necessarily prohibit approving such a project. The agency can proceed if it adopts a written statement of overriding considerations explaining why the project’s economic, legal, social, technological, or environmental benefits outweigh the unavoidable harm. The statement must be supported by substantial evidence in the record and must identify the specific benefits that justify accepting the remaining impacts.16Legal Information Institute. California Code of Regulations Title 14 Section 15093 – Statement of Overriding Considerations This is how large infrastructure projects and major developments get approved despite acknowledged environmental costs. It does not excuse the agency from analyzing or mitigating what it can.
Notices, Fees, and Deadlines to Sue
After approving a project that required a negative declaration, mitigated negative declaration, or EIR, the lead agency must file a Notice of Determination with the county clerk and the State Clearinghouse within five working days. Filing triggers the statute of limitations: 30 days from the date of filing to sue over either an EIR or a negative declaration.4California Legislative Information. California Public Resources Code PRC 21167 If no Notice of Determination is filed, the window extends to 180 days from the approval date.
Filing a Notice of Determination also requires payment of a California Department of Fish and Wildlife environmental document filing fee. For 2026, the fees are $4,227.50 for a project that prepared an EIR and $3,043.75 for a project that used a negative declaration or mitigated negative declaration.17California Department of Fish and Wildlife. 2026 Environmental Document Filing Fee Receipt The county clerk charges a separate processing fee. Without the CDFW fee, the clerk will not accept the Notice of Determination, which means the 30-day statute of limitations never starts running. Notices of Exemption do not carry the CDFW environmental fee, though the clerk’s processing fee still applies.
CEQA lawsuits are filed as petitions for writ of mandate, asking a court to order the agency to set aside its approval and redo the review. The deadlines are tight: 30 days after a Notice of Determination is filed for EIR and negative declaration challenges, 35 days after a Notice of Exemption is filed for exemption challenges, and 180 days when no notice is filed at all.4California Legislative Information. California Public Resources Code PRC 21167
If a court finds a CEQA violation, remedies range from narrow corrections to full decertification of the EIR and invalidation of every project approval that depended on it. Courts are directed to limit their orders to what is necessary to achieve compliance, but a successful challenge often halts construction until the agency fixes the deficient analysis. California follows the general American rule that each side pays its own attorney fees, though courts can award fees to a prevailing plaintiff in CEQA cases. The financial exposure from a successful challenge, once new studies, project delays, and legal fees are combined, often runs well into six or seven figures.