---
type: "Bill"
title: "Alquist-Priolo Earthquake Fault Zoning Act: exemptions."
description: "Under the Alquist-Priolo Earthquake Fault Zoning Act, before 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 the conversion of an existing apartment complex into a condominium, projects for the alteration or addition of any structure if the value of the alteration or addition does not exceed 50% of the value of the structure, and 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: "20232024"
identifier: "AB 1046"
citation: "California AB 1046 (20232024)"
classification: ["bill"]
subjects: ["Alquist-Priolo Earthquake Fault Zoning Act", "exemptions"]
status: "enacted"
primary_sponsors: ["Lowenthal"]
version_count: 7
action_count: 22
vote_count: 6
first_action: "2023-02-15"
last_action: "2023-10-13"
source: "openstates"
source_identifier: "ocd-bill/0caf2089-1681-4960-b3ea-1e289dadb8e0"
source_url: "http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202320240AB1046"
source_hash: "348886efe352bb83dde5ab92079e66ee9082dea130f087559b05cca6baaa49c8"
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 1046 (20232024) — Alquist-Priolo Earthquake Fault Zoning Act: exemptions.

Under the Alquist-Priolo Earthquake Fault Zoning Act, before 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 the conversion of an existing apartment complex into a condominium, projects for the alteration or addition of any structure if the value of the alteration or addition does not exceed 50% of the value of the structure, and 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. **02/15/23 - Introduced** (filed) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB1046&version=20230AB104699INT)
2. **04/18/23 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB1046&version=20230AB104698AMD)
3. **06/07/23 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB1046&version=20230AB104697AMD)
4. **06/15/23 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB1046&version=20230AB104696AMD)
5. **10/13/23 - Chaptered** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB1046&version=20230AB104694CHP)
6. **AB1046** (committee substitute) — [source](http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202320240AB1046)
7. **09/12/23 - Enrolled** (enrolled) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240AB1046&version=20230AB104695ENR)

## Votes

- Do pass as amended, but first amend, and re-refer to the Committee on [Appropriations] with the recommendation: To Consent Calendar — **8–0** (pass) · upper
- AB 1046 Lowenthal Consent Calendar Second Day — **76–0** (pass) · lower
- Do pass. To Consent Calendar. — **15–0** (pass) · lower
- Do pass and be re-referred to the Committee on [Appropriations] with recommendation: To Consent Calendar — **8–0** (pass) · lower
- AB 1046 Lowenthal Concurrence in Senate Amendments — **80–0** (pass) · lower
- Consent Calendar — **39–0** (pass) · upper

## Sponsors

- Lowenthal — primary (person)

## Timeline

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

- **2023-02-15** Read first time. To print. `reading-1`
- **2023-02-16** From printer. May be heard in committee March 18.
- **2023-03-02** Referred to Com. on L. GOV. `referral-committee`
- **2023-04-18** From committee chair, with author's amendments: Amend, and re-refer to Com. on L. GOV. Read second time and amended. `amendment-introduction, amendment-passage, reading-1, reading-2`
- **2023-04-19** Re-referred to Com. on L. GOV. `referral-committee`
- **2023-04-27** From committee: Do pass and re-refer to Com. on APPR. with recommendation: To Consent Calendar. (Ayes 8. Noes 0.) (April 26). Re-referred to Com. on APPR. `committee-passage, committee-passage-favorable, referral-committee`
- **2023-05-17** From committee: Do pass. To Consent Calendar. (Ayes 15. Noes 0.) (May 17). `committee-passage, committee-passage-favorable`
- **2023-05-18** Read second time. Ordered to Consent Calendar. `reading-1, reading-2`
- **2023-05-25** Read third time. Passed. Ordered to the Senate. (Ayes 76. Noes 0. Page 1811.) `passage, reading-1, reading-3`
- **2023-05-26** In Senate. Read first time. To Com. on RLS. for assignment. `reading-1`
- **2023-06-07** Referred to Com. on GOV. & F. `referral-committee`
- **2023-06-07** From committee chair, with author's amendments: Amend, and re-refer to committee. Read second time, amended, and re-referred to Com. on GOV. & F. `amendment-introduction, amendment-passage, reading-1, reading-2, referral-committee`
- **2023-06-14** From committee: Amend, and do pass as amended and re-refer to Com. on APPR with recommendation: To Consent Calendar. (Ayes 8. Noes 0.) (June 14). `amendment-introduction, amendment-passage, committee-passage, referral-committee`
- **2023-06-15** Read second time and amended. Re-referred to Com. on APPR. `amendment-passage, reading-1, reading-2, referral-committee`
- **2023-06-26** From committee: Be ordered to second reading file pursuant to Senate Rule 28.8 and ordered to Consent Calendar. `committee-passage, reading-2`
- **2023-06-27** Read second time. Ordered to Consent Calendar. `reading-1, reading-2`
- **2023-06-29** Read third time. Passed. Ordered to the Assembly. (Ayes 39. Noes 0. Page 1828.). `passage, reading-1, reading-3`
- **2023-06-29** In Assembly. Concurrence in Senate amendments pending. May be considered on or after July 1 pursuant to Assembly Rule 77.
- **2023-09-11** Senate amendments concurred in. To Engrossing and Enrolling. (Ayes 80. Noes 0. Page 3166.). `amendment-passage, committee-passage-favorable`
- **2023-09-15** Enrolled and presented to the Governor at 4 p.m.
- **2023-10-13** Approved by the Governor. `executive-signature`
- **2023-10-13** Chaptered by Secretary of State - Chapter 825, Statutes of 2023. `became-law`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/0caf2089-1681-4960-b3ea-1e289dadb8e0`. Confidence: reported (aggregated from official California legislature records).