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---
type: "Bill"
title: "Sepulveda Basin: planning process: nature-based climate solutions."
description: "The Regional Planning Law provides that the people of California have a fundamental interest in the orderly development of the urban regions of the state in which large segments of the state's population are concentrated. Existing law requires, in order to facilitate effective and harmonious planning and development of an area included in a regional planning district, all county and city legislative bodies, and all county, city, or other planning agencies within the regional planning district to file with the regional planning board, for its information, among other things, all published development plans."
jurisdiction: "us/states/ca"
legislature: "California Legislature"
session: "20232024"
identifier: "SB 539"
citation: "California SB 539 (20232024)"
classification: ["bill"]
subjects: ["Sepulveda Basin", "nature-based climate solutions", "planning process"]
status: "enacted"
primary_sponsors: ["Stern"]
version_count: 6
action_count: 26
vote_count: 8
first_action: "2023-02-14"
last_action: "2023-10-08"
source: "openstates"
source_identifier: "ocd-bill/2a67dba3-6257-484a-98d4-9a6f8cf7dcf4"
source_url: "http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202320240SB539"
source_hash: "9b4392750d13d255131a6cae1c98650682e8663a381f4a56c59cd1b914b25035"
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 SB 539 (20232024) — Sepulveda Basin: planning process: nature-based climate solutions.
The Regional Planning Law provides that the people of California have a fundamental interest in the orderly development of the urban regions of the state in which large segments of the state's population are concentrated. Existing law requires, in order to facilitate effective and harmonious planning and development of an area included in a regional planning district, all county and city legislative bodies, and all county, city, or other planning agencies within the regional planning district to file with the regional planning board, for its information, among other things, all published development plans.
## Version chain
The bill's text revisions, in order — the diff chain from filing to enrollment.
1. **02/14/23 - Introduced** (filed) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240SB539&version=20230SB53999INT)
2. **03/29/23 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240SB539&version=20230SB53998AMD)
3. **06/14/23 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240SB539&version=20230SB53997AMD)
4. **10/08/23 - Chaptered** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240SB539&version=20230SB53995CHP)
5. **SB539** (committee substitute) — [source](http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202320240SB539)
6. **09/19/23 - Enrolled** (enrolled) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202320240SB539&version=20230SB53996ENR)
## Votes
- Special Consent — **40–0** (pass) · upper
- Do pass as amended, but first amend, and re-refer to the Committee on [Appropriations] with the recommendation: To Consent Calendar — **10–0** (pass) · upper
- Placed on suspense file — **6–0** (pass) · upper
- Do pass. — **16–0** (pass) · lower
- SB 539 Stern Senate Third Reading By Friedman — **79–0** (pass) · lower
- Do pass and be re-referred to the Committee on [Appropriations] with recommendation: To Consent Calendar — **11–0** (pass) · lower
- Do pass — **7–0** (pass) · upper
- Unfinished Business SB539 Stern Concurrence — **40–0** (pass) · upper
## Sponsors
- Stern — primary (person)
## Timeline
The legislative action history — every referral, reading, and vote.
- **2023-02-14** Introduced. Read first time. To Com. on RLS. for assignment. To print. `introduction, reading-1`
- **2023-02-15** From printer. May be acted upon on or after March 17.
- **2023-02-22** Referred to Com. on N.R. & W. `referral-committee`
- **2023-03-07** Set for hearing March 28.
- **2023-03-28** From committee: Do pass as amended and re-refer to Com. on APPR with recommendation: To consent calendar. (Ayes 10. Noes 0. Page 547.) (March 28). `amendment-passage, committee-passage, committee-passage-favorable`
- **2023-03-29** Read second time and amended. Re-referred to Com. on APPR. `amendment-passage, reading-1, reading-2, referral-committee`
- **2023-04-10** Set for hearing April 17.
- **2023-04-17** April 17 hearing: Placed on APPR suspense file.
- **2023-05-12** Set for hearing May 18.
- **2023-05-18** From committee: Do pass. (Ayes 7. Noes 0. Page 1174.) (May 18). `committee-passage, committee-passage-favorable`
- **2023-05-18** Read second time. Ordered to third reading. `reading-1, reading-2`
- **2023-05-23** Ordered to special consent calendar.
- **2023-05-25** Read third time. Passed. (Ayes 40. Noes 0. Page 1301.) Ordered to the Assembly. `passage, reading-1, reading-3`
- **2023-05-25** In Assembly. Read first time. Held at Desk. `reading-1`
- **2023-06-08** Referred to Com. on NAT. RES. `referral-committee`
- **2023-06-14** From committee with author's amendments. Read second time and amended. Re-referred to Com. on NAT. RES. `amendment-passage, committee-passage, reading-1, reading-2, referral-committee`
- **2023-06-27** From committee: Do pass and re-refer to Com. on APPR. with recommendation: To consent calendar. (Ayes 11. Noes 0.) (June 26). Re-referred to Com. on APPR. `committee-passage, committee-passage-favorable, referral-committee`
- **2023-08-16** August 16 set for first hearing. Placed on suspense file.
- **2023-09-01** From committee: Do pass. (Ayes 16. Noes 0.) (September 1). `committee-passage, committee-passage-favorable`
- **2023-09-05** Read second time. Ordered to third reading. `reading-1, reading-2`
- **2023-09-13** Read third time. Passed. (Ayes 79. Noes 0. Page 3353.) Ordered to the Senate. `passage, reading-1, reading-3`
- **2023-09-13** In Senate. Concurrence in Assembly amendments pending.
- **2023-09-14** Assembly amendments concurred in. (Ayes 40. Noes 0. Page 2784.) Ordered to engrossing and enrolling. `amendment-passage, committee-passage-favorable`
- **2023-09-21** Enrolled and presented to the Governor at 4 p.m.
- **2023-10-08** Approved by the Governor. `executive-signature`
- **2023-10-08** Chaptered by Secretary of State. Chapter 490, 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/2a67dba3-6257-484a-98d4-9a6f8cf7dcf4`. Confidence: reported (aggregated from official California legislature records).