California Codes

Cal. Public Resources Code § 21100 (2026)

State Agencies, Boards and Commissions

✓ current as of May 2026
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(a)All lead agencies shall prepare, or cause to be prepared by contract, and certify the completion of, an environmental impact report on any project which they propose to carry out or approve that may have a significant effect on the environment. Whenever feasible, a standard format shall be used for environmental impact reports.

(b)The environmental impact report shall include a detailed statement setting forth all of the following:

(1)All significant effects on the environment of the proposed project.

(2)In a separate section:

(A)Any significant effect on the environment that cannot be avoided if the project is implemented.

(B)Any significant effect on the environment that would be irreversible if the project is implemented.

(3)Mitigation measures proposed to minimize significant effects on the environment, including, but not limited to, measures to reduce the wasteful, inefficient, and unnecessary consumption of energy.

(4)Alternatives to the proposed project.

(5)The growth-inducing impact of the proposed project.

(c)The report shall also contain a statement briefly indicating the reasons for determining that various effects on the environment of a project are not significant and consequently have not been discussed in detail in the environmental impact report.

(d)For purposes of this section, any significant effect on the environment shall be limited to substantial, or potentially substantial, adverse changes in physical conditions which exist within the area as defined in Section 21060.5.

(e)Previously approved land use documents, including, but not limited to, general plans, specific plans, and local coastal plans, may be used in cumulative impact analysis.

Notes of Decisions
Cited in 17 cases, 1972–2015 · leading case: City of Redlands v. Cnty. of San Bernardino, 117 Cal. Rptr. 2d 582 (Cal. Ct. App. 2002).
City of Redlands v. Cnty. of San Bernardino, 117 Cal. Rptr. 2d 582 (Cal. Ct. App. 2002). · cites it 2× “4 Public Resources Code section 21100; Pala Band of Mission Indians v.”
Bozung v. Local Agency Formation Comm'n, 529 P.2d 1017 (Cal. 1975). · cites it 2× “) Public Resources Code, section 21100 sets forth the factors the EIR must consider, including adverse environmental effects, mitigation measures and alternatives to the "proposed action.”
Tracy First v. City of Tracy, 99 Cal. Rptr. 3d 621 (Cal. Ct. App. 2009). “Unfortunately, the Trial Court fell prey to the City’s assertion that Title 24 compliance preempts CEQA compliance, thereby rendering [Public Resources Code section 21100, subdivision (b)(3)] (requiring an EIR to include a detailed statement setting forth mitigation measures…”
Cnty. of Los Angeles v. California State Water Resources Control Bd., 50 Cal. Rptr. 3d 619 (Cal. Ct. App. 2006). “” 7 Public Resources Code section 21100 as enacted in 1970 stated: “All state agencies, boards, and commissions shall include in any report on any project they propose to carry out which could have a significant effect on the environment of the state, a detailed statement by the…”
Sierra Club v. Morton, 400 F. Supp. 610 (N.D. Cal. 1975). · cites it 2× “If the Bureau of Reclamation completes preparation of an Environmental Impact Statement with respect to the Peripheral Canal, then that report may be filed in lieu of the Environmental Impact Statement required by this order with respect to the Canal and that filing will obviate…”
Arviv Enter., Inc. v. South Valley Area Plan. Comm'n, 125 Cal. Rptr. 2d 140 (Cal. Ct. App. 2002). “5 Public Resources Code section 21000 et seq.”
Nat. Resources Def. Council, Inc. v. California Coastal Zone Conservation Comm'n, 57 Cal. App. 3d 76 (Cal. Ct. App. 1976). · cites it 2× “" Public Resources Code section 21100: "All state agencies, boards, and commissions shall prepare, or cause to be prepared by contract, and certify the completion of an environmental impact report on any project they propose to carry out or approve which may have a significant…”
San Joaquin Raptor/Wildlife Rescue Ctr. v. Cnty. of Stanislaus, 42 Cal. App. 4th 608 (Cal. Ct. App. 1996). “” Similarly, Public Resources Code section 21151 states in part that “[a] 11 local agencies shall prepare, or cause to be prepared by contract, and certify the completion of an environmental impact report on any project that they intend to carry out or approve which may have a…”
Env't Def. Fund, Inc. v. Coastside Cnty. Water Dist., 2 Envtl. L. Rep. (Envtl. Law Inst.) 20 (Cal. Ct. App. 1972). “” Public Resources Code section 21100 sets forth the following elements which are to be contained in an environmental impact report: “(a) The environmental impact of the proposed action, (b) Any adverse environmental effects which cannot be avoided if the proposal is…”
San Francisco Ecology Ctr. v. City & Cnty. of San Francisco, 48 Cal. App. 3d 584 (Cal. Ct. App. 1975). “” 8 Public Resources Code section 21100 provides: “All state agencies, boards, and commissions shall prepare, or cause to be prepared by contract, and certify the completion of an environmental impact report on any project they propose to carry out or approve which may have a…”
People v. Cnty. of Kern, 62 Cal. App. 3d 761 (Cal. Ct. App. 1976). “) Moreover, Public Resources Code section 21100, subdivision (c), should probably be given retroactive application.”
Main San Gabriel Basin Watermaster v. State Water Resources Control Bd., 12 Cal. App. 4th 1371 (Cal. Ct. App. 1993). “Public Resources Code section 21100 declares, inter alia, that “[a]ll state agencies, boards, and commissions shall prepare, or cause to be prepared by contract, and certify the completion of an environmental impact report on any project they propose to carry out or approve…”
Cal. Public Resources Code § 21100(b)(3): 1 case
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