---
type: "Bill"
title: "Geologic hazards: earthquake fault zoning."
description: "Under the Alquist-Priolo Earthquake Fault Zoning Act, prior to approving a project within an earthquake fault zone, a city or county is directed to require the preparation of a geologic report, subject to certain exceptions. Existing law exempts from this requirement certain projects for alterations that include seismic retrofitting if a city or county, among other things, requires certain seismic retrofitting and prohibits an increase in human occupancy load."
jurisdiction: "us/states/ca"
legislature: "California Legislature"
session: "20092010"
identifier: "AB 2133"
citation: "California AB 2133 (20092010)"
classification: ["bill"]
subjects: ["Geologic hazards: earthquake fault zoning."]
status: "enacted"
primary_sponsors: ["Niello"]
version_count: 7
action_count: 28
vote_count: 6
first_action: "2010-02-18"
last_action: "2010-09-24"
source: "openstates"
source_identifier: "ocd-bill/342ce6e4-5df0-4fdd-9012-66362aac6b74"
source_url: "http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=200920100AB2133"
source_hash: "f971e4726c903f479f2bddad8f39005d15ea3c9df2f3a652f578145eaf18383e"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-ca"]
---

# California AB 2133 (20092010) — Geologic hazards: earthquake fault zoning.

Under the Alquist-Priolo Earthquake Fault Zoning Act, prior to approving a project within an earthquake fault zone, a city or county is directed to require the preparation of a geologic report, subject to certain exceptions. Existing law exempts from this requirement certain projects for alterations that include seismic retrofitting if a city or county, among other things, requires certain seismic retrofitting and prohibits an increase in human occupancy load.

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **02/18/10 - Introduced** (filed) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=200920100AB2133&version=20090AB213399INT)
2. **04/29/10 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=200920100AB2133&version=20090AB213398AMD)
3. **05/13/10 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=200920100AB2133&version=20090AB213397AMD)
4. **08/20/10 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=200920100AB2133&version=20090AB213396AMD)
5. **09/24/10 - Chaptered** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=200920100AB2133&version=20090AB213394CHP)
6. **AB2133** (committee substitute) — [source](http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=200920100AB2133)
7. **09/01/10 - Enrolled** (enrolled) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=200920100AB2133&version=20090AB213395ENR)

## Votes

- Do pass and be re-referred to the Committee on Appropriations. — **pass** (pass) · lower
- Do pass, but re-refer to the Committee on Appropriations. — **pass** (pass) · upper
- AB 2133 NIELLO Concurrence in Senate Amendments — **pass** (pass) · lower
- Assembly 3rd Reading AB2133 Niello By Liu — **pass** (pass) · upper
- AB 2133 NIELLO Assembly Third Reading — **pass** (pass) · lower
- Do pass. — **pass** (pass) · lower

## Sponsors

- Niello — primary (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2010-02-18** Read first time. To print. `reading-1`
- **2010-02-19** From printer. May be heard in committee March 21.
- **2010-03-04** Referred to Com. on L. GOV. `referral-committee`
- **2010-04-06** In committee: Set, first hearing. Hearing canceled at the request of author.
- **2010-04-22** From committee: Do pass, and re-refer to Com. on APPR. Re-referred. (Ayes 8. Noes 0.) (April 21). `committee-passage-favorable, committee-passage`
- **2010-04-29** From committee chair, with author's amendments: Amend, and re-refer to Com. on APPR. Read second time and amended. `amendment-introduction, reading-2, amendment-passage, reading-1`
- **2010-05-03** Re-referred to Com. on APPR. `referral-committee`
- **2010-05-13** From committee chair, with author's amendments: Amend, and re-refer to Com. on APPR. Read second time and amended. `amendment-introduction, reading-2, amendment-passage, reading-1`
- **2010-05-17** Re-referred to Com. on APPR. `referral-committee`
- **2010-05-19** From committee: Do pass. (Ayes 16. Noes 0.) (May 19). `committee-passage-favorable, committee-passage`
- **2010-05-20** Read second time. To third reading. `reading-2, reading-1`
- **2010-05-24** Read third time, passed, and to Senate. (Ayes 69. Noes 1. Page 5287.) `reading-3, passage, reading-1`
- **2010-05-24** In Senate. Read first time. To Com. on RLS. for assignment. `reading-1`
- **2010-06-03** Referred to Com. on L. GOV. `referral-committee`
- **2010-06-30** From committee: Do pass, and re-refer to Com. on APPR. Re-referred. (Ayes 4. Noes 0.) (June 30). `committee-passage-favorable, committee-passage`
- **2010-08-02** From committee: Be placed on second reading file pursuant to Senate Rule 28.8. `committee-passage`
- **2010-08-03** Read second time. To third reading. `reading-2, reading-1`
- **2010-08-20** Read third time, amended. To second reading. `reading-3, amendment-passage, reading-1`
- **2010-08-20** (Corrected August 27.)
- **2010-08-20** (Corrected August 30.)
- **2010-08-23** Read second time. To third reading. `reading-2, reading-1`
- **2010-08-24** Read third time, passed, and to Assembly. (Ayes 32. Noes 3. Page 4840.) `reading-3, passage, reading-1`
- **2010-08-24** In Assembly. Concurrence in Senate amendments pending. May be considered on or after August 26 pursuant to Assembly Rule 77.
- **2010-08-25** Assembly Rule 77 suspended. (Page 6644.)
- **2010-08-25** Senate amendments concurred in. To enrollment. (Ayes 74. Noes 0. Page 6659.) `amendment-passage, committee-passage-favorable`
- **2010-09-03** Enrolled and to the Governor at 3 p.m.
- **2010-09-23** Approved by the Governor. `executive-signature`
- **2010-09-24** Chaptered by Secretary of State - Chapter 251, Statutes of 2010.

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/342ce6e4-5df0-4fdd-9012-66362aac6b74`. Confidence: reported (aggregated from official California legislature records).