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---
type: "Bill"
title: "Dams: exceptions."
description: "Existing law defines a dam to mean any artificial barrier, together with appurtenant works, that does or may impound or divert water, and meets other specified criteria. Existing law excludes from the definition a barrier that is or will be not in excess of 6 feet in height, regardless of storage capacity, or that has or will have a storage capacity not in excess of 15 acre-feet, regardless of height. Existing law requires the Department of Water Resources to supervise the construction, enlargement, alteration, repair, maintenance, operation, and removal of dams and reservoirs for the protection of life and property."
jurisdiction: "us/states/ca"
legislature: "California Legislature"
session: "20252026"
identifier: "AB 639"
citation: "California AB 639 (20252026)"
classification: ["bill"]
subjects: ["Dams", "exceptions"]
status: "enacted"
primary_sponsors: ["Soria"]
version_count: 6
action_count: 21
vote_count: 6
first_action: "2025-02-13"
last_action: "2025-10-11"
source: "openstates"
source_identifier: "ocd-bill/ec6064b3-efb5-4878-8a01-6a11c0bbfcd0"
source_url: "http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260AB639"
source_hash: "fb65d06dba6058f8f1164cb69fa5af938c5199c366cd16d73b2788f3345da1d5"
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 639 (20252026) — Dams: exceptions.
Existing law defines a dam to mean any artificial barrier, together with appurtenant works, that does or may impound or divert water, and meets other specified criteria. Existing law excludes from the definition a barrier that is or will be not in excess of 6 feet in height, regardless of storage capacity, or that has or will have a storage capacity not in excess of 15 acre-feet, regardless of height. Existing law requires the Department of Water Resources to supervise the construction, enlargement, alteration, repair, maintenance, operation, and removal of dams and reservoirs for the protection of life and property.
## Version chain
The bill's text revisions, in order — the diff chain from filing to enrollment.
1. **02/13/25 - Introduced** (filed) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202520260AB639&version=20250AB63999INT)
2. **03/28/25 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202520260AB639&version=20250AB63998AMD)
3. **06/11/25 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202520260AB639&version=20250AB63997AMD)
4. **10/11/25 - Chaptered** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202520260AB639&version=20250AB63995CHP)
5. **AB639** (committee substitute) — [source](http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=202520260AB639)
6. **09/08/25 - Enrolled** (enrolled) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=202520260AB639&version=20250AB63996ENR)
## Votes
- AB 639 Soria Assembly Third Reading — **73–0** (pass) · lower
- Do pass as amended and be re-referred to the Committee on [Appropriations] — **13–0** (pass) · lower
- Do pass. — **14–0** (pass) · lower
- AB 639 Soria Concurrence in Senate Amendments — **78–0** (pass) · lower
- Do pass as amended, but first amend, and re-refer to the Committee on [Appropriations] — **7–0** (pass) · upper
- 3rd Reading AB639 Soria By Caballero — **38–1** (pass) · upper
## Sponsors
- Soria — primary (person)
## Timeline
The legislative action history — every referral, reading, and vote.
- **2025-02-13** Read first time. To print. `reading-1`
- **2025-02-14** From printer. May be heard in committee March 16.
- **2025-02-24** Referred to Com. on W. P., & W. `referral-committee`
- **2025-03-27** From committee: Amend, and do pass as amended and re-refer to Com. on APPR. (Ayes 13. Noes 0.) (March 25). `amendment-introduction, amendment-passage, committee-passage, referral-committee`
- **2025-03-28** Read second time and amended. `amendment-passage, reading-1, reading-2`
- **2025-04-01** Re-referred to Com. on APPR. `referral-committee`
- **2025-04-09** From committee: Do pass. (Ayes 14. Noes 0.) (April 9). `committee-passage, committee-passage-favorable`
- **2025-04-10** Read second time. Ordered to third reading. `reading-1, reading-2`
- **2025-04-21** Read third time. Passed. Ordered to the Senate. (Ayes 73. Noes 0. Page 1175.) `passage, reading-1, reading-3`
- **2025-04-21** In Senate. Read first time. To Com. on RLS. for assignment. `reading-1`
- **2025-05-07** Referred to Com. on N.R. & W. `referral-committee`
- **2025-06-10** From committee: Amend, and do pass as amended and re-refer to Com. on APPR. (Ayes 7. Noes 0.) (June 10). `amendment-introduction, amendment-passage, committee-passage, referral-committee`
- **2025-06-11** Read second time and amended. Re-referred to Com. on APPR. `amendment-passage, reading-1, reading-2, referral-committee`
- **2025-06-23** From committee: Be ordered to second reading pursuant to Senate Rule 28.8. `committee-passage, reading-2`
- **2025-06-24** Read second time. Ordered to third reading. `reading-1, reading-2`
- **2025-09-03** Read third time. Passed. Ordered to the Assembly. (Ayes 38. Noes 1. Page 2427.). `passage, reading-1, reading-3`
- **2025-09-03** In Assembly. Concurrence in Senate amendments pending.
- **2025-09-04** Senate amendments concurred in. To Engrossing and Enrolling. (Ayes 78. Noes 0. Page 2918.). `amendment-passage, committee-passage-favorable`
- **2025-09-11** Enrolled and presented to the Governor at 4 p.m.
- **2025-10-11** Approved by the Governor. `executive-signature`
- **2025-10-11** Chaptered by Secretary of State - Chapter 617, Statutes of 2025. `became-law`
## Source
OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/ec6064b3-efb5-4878-8a01-6a11c0bbfcd0`. Confidence: reported (aggregated from official California legislature records).