---
type: "Bill"
title: "Groundwater."
description: "Groundwater."
jurisdiction: "us/states/ca"
legislature: "California Legislature"
session: "19992000"
identifier: "AB 303"
citation: "California AB 303 (19992000)"
classification: ["bill"]
subjects: ["Groundwater."]
status: "enacted"
primary_sponsors: ["Thomson"]
version_count: 13
action_count: 35
vote_count: 8
first_action: "1999-02-08"
last_action: "2000-09-27"
source: "openstates"
source_identifier: "ocd-bill/74492249-23e3-494b-9ad9-9ff66f389c91"
source_url: "http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=199920000AB303"
source_hash: "ce28a2b3705cf3274d287c50d9a9f03577a1bbd671894dbaa4194256fdd3c24a"
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 303 (19992000) — Groundwater.

## Version chain

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

1. **02/08/99 - Introduced** (filed) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=199920000AB303&version=19990AB30399INT)
2. **03/17/99 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=199920000AB303&version=19990AB30398AMD)
3. **04/07/99 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=199920000AB303&version=19990AB30397AMD)
4. **05/28/99 - Amended Assembly** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=199920000AB303&version=19990AB30396AMD)
5. **06/22/00 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=199920000AB303&version=19990AB30392AMD)
6. **06/22/99 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=199920000AB303&version=19990AB30395AMD)
7. **07/13/99 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=199920000AB303&version=19990AB30394AMD)
8. **08/14/00 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=199920000AB303&version=19990AB30391AMD)
9. **08/16/99 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=199920000AB303&version=19990AB30393AMD)
10. **08/29/00 - Amended Senate** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=199920000AB303&version=19990AB30390AMD)
11. **09/27/00 - Chaptered** (committee substitute) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=199920000AB303&version=19990AB30388CHP)
12. **AB303** (committee substitute) — [source](http://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id=199920000AB303)
13. **08/31/00 - Enrolled** (enrolled) — [source](https://leginfo.legislature.ca.gov/faces/billPdf.xhtml?bill_id=199920000AB303&version=19990AB30389ENR)

## Votes

- Do pass as amended. — **pass** (pass) · lower
- AB 303 THOMSON CONCURRENCE BY SHELLEY — **pass** (pass) · lower
- Assembly 3rd Reading AB303 Thomson By Costa — **pass** (pass) · upper
- Do pass and be re-referred to the Committee on Appropriations. — **pass** (pass) · lower
- Do pass as amended, and re-refer to the Committee on Appropriations. — **pass** (pass) · upper
- Placed on Appropriations suspense file. — **pass** (pass) · upper
- AB 303 THOMSON THIRD READING — **pass** (pass) · lower
- Do pass as amended. — **pass** (pass) · upper

## Sponsors

- Thomson — primary (person)
- Dickerson — coauthor (person)
- Machado — coauthor (person)
- Margett — coauthor (person)
- Papan — coauthor (person)
- Wayne — coauthor (person)

## Timeline

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

- **2000-09-27** Chaptered by Secretary of State - Chapter 708, Statutes of 2000.
- **2000-09-25** Approved by the Governor. `executive-signature`
- **2000-09-13** Enrolled and to the Governor at 4 p.m.
- **2000-08-31** Senate amendments concurred in. To enrollment. (Ayes 75. Noes 2. Page 8841.) `committee-passage-favorable, amendment-passage`
- **2000-08-30** In Assembly. Concurrence in Senate amendments pending.
- **2000-08-30** Read third time, passed, and to Assembly. (Ayes 40. Noes 0. Page 6289.) `passage, reading-3, reading-1`
- **2000-08-29** From committee: Amend, and do pass as amended. (Ayes 13. Noes 0.). Read second time, amended, and to third reading. `amendment-introduction, amendment-passage, committee-passage, reading-2, reading-1`
- **2000-08-22** Joint Rule 61(b)(14) suspended.
- **2000-08-14** From committee chair, with author's amendments: Amend, and re-refer to committee. Read second time, amended, and re-referred to Standing Committee on Appropriations. `amendment-introduction, amendment-passage, reading-2, reading-1, referral-committee`
- **2000-06-22** From committee chair, with author's amendments: Amend, and re-refer to committee. Read second time, amended, and re-referred to Standing Committee on Appropriations. `amendment-introduction, amendment-passage, reading-2, reading-1, referral-committee`
- **1999-09-08** In committee: Hearing postponed by committee.
- **1999-09-07** Joint Rule 62(a), file notice waived. (Page 3019.)
- **1999-09-03** Joint Rule 61 (a) suspended. In committee: Set, second hearing. Hearing canceled at the request of author.
- **1999-09-01** In committee: Set, first hearing. Held under submission.
- **1999-08-23** Joint Rule 61 (a) suspended.
- **1999-08-16** In committee: Placed on Appropriations suspense file.
- **1999-08-16** From committee chair, with author's amendments: Amend, and re-refer to committee. Read second time, amended, and re-referred to Standing Committee on Appropriations. `amendment-introduction, amendment-passage, reading-2, reading-1, referral-committee`
- **1999-07-13** Read second time, amended, and re-referred to Standing Committee on Appropriations. `amendment-passage, reading-2, reading-1, referral-committee`
- **1999-07-12** From committee: Amend, do pass as amended, and re-refer to Standing Committee on Appropriations (Ayes 7. Noes 1.). `committee-passage, amendment-introduction, amendment-passage, referral-committee`
- **1999-06-22** From committee chair, with author's amendments: Amend, and re-refer to committee. Read second time, amended, and re-referred to Com. on AGR. & WAT. RES. `amendment-introduction, amendment-passage, reading-2, reading-1, referral-committee`
- **1999-06-07** Referred to Com. on AGR. & WAT. RES. `referral-committee`
- **1999-06-03** In Senate. Read first time. To Standing Committee on Rules for assignment. `reading-1`
- **1999-06-02** Read third time, passed, and to Senate. (Ayes 76. Noes 2. Page 2293.) `passage, reading-3, reading-1`
- **1999-06-01** Read second time. To third reading. `reading-2, reading-1`
- **1999-05-28** From committee: Amend, and do pass as amended. (Ayes 21. Noes 0.) (May 26). Read second time and amended. Ordered returned to second reading. `amendment-introduction, amendment-passage, committee-passage, reading-2, reading-1`
- **1999-04-28** In committee: Set, first hearing. Referred to Standing Committee on Appropriations suspense file. `referral-committee`
- **1999-04-14** From committee: Do pass, and re-refer to Standing Committee on Appropriations Re-referred. (Ayes 13. Noes 0.) (April 13). `committee-passage, committee-passage-favorable, referral-committee`
- **1999-04-08** Re-referred to Standing Committee on Water, Parks and Wildlife. `referral-committee`
- **1999-04-07** From committee chair, with author's amendments: Amend, and re-refer to Standing Committee on Water, Parks and Wildlife Read second time and amended. `amendment-introduction, amendment-passage, reading-2, reading-1, referral-committee`
- **1999-03-24** In committee: Hearing postponed by committee.
- **1999-03-18** Re-referred to Standing Committee on Water, Parks and Wildlife. `referral-committee`
- **1999-03-17** From committee chair, with author's amendments: Amend, and re-refer to Standing Committee on Water, Parks and Wildlife Read second time and amended. `amendment-introduction, amendment-passage, reading-2, reading-1, referral-committee`
- **1999-02-19** Referred to Standing Committee on Water, Parks and Wildlife. `referral-committee`
- **1999-02-09** From printer. May be heard in committee March 11.
- **1999-02-08** Read first time. To print. `reading-1`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/74492249-23e3-494b-9ad9-9ff66f389c91`. Confidence: reported (aggregated from official California legislature records).