---
type: "Bill"
title: "unbuilt certificates; assured water supply"
description: "unbuilt certificates; assured water supply"
jurisdiction: "us/states/az"
legislature: "Arizona Legislature"
session: "57th-1st-regular"
identifier: "SB 1521"
citation: "Arizona SB 1521 (57th-1st-regular)"
classification: ["bill"]
subjects: []
status: "enacted"
primary_sponsors: ["Timothy \"Tim\" Dunn"]
version_count: 6
action_count: 16
vote_count: 6
first_action: "2025-02-10"
last_action: "2025-05-12"
source: "openstates"
source_identifier: "ocd-bill/d88cc8e8-6ca0-4a0e-af2a-43ae9cda0d35"
source_url: "https://apps.azleg.gov/BillStatus/BillOverview/82958?SessionId=129"
source_hash: "9ed3806d31f4ba8364a127c1eca89110a28da68eec549d0387b5a9e9d88f440e"
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-az"]
---

# Arizona SB 1521 (57th-1st-regular) — unbuilt certificates; assured water supply

## Version chain

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

1. **Chaptered Version** (committee substitute) — [source](https://www.azleg.gov/legtext/57leg/1r/laws/0162.pdf)
2. **HOUSE - 1521NATURAL RESOURCES ENERGY WATER.PDF** (committee substitute) — [source](https://apps.azleg.gov/BillStatus/GetDocumentPdf/528525)
3. **HOUSE - Natural Resources, Energy & Water - Strike Everything** (committee substitute) — [source](https://apps.azleg.gov/BillStatus/GetDocumentPdf/528088)
4. **House Engrossed Version** (committee substitute) — [source](https://www.azleg.gov/legtext/57leg/1r/bills/sb1521h.pdf)
5. **Introduced Version** (committee substitute) — [source](https://www.azleg.gov/legtext/57leg/1r/bills/sb1521p.pdf)
6. **Senate Engrossed Version** (committee substitute) — [source](https://www.azleg.gov/legtext/57leg/1r/bills/sb1521s.pdf)

## Votes

- do pass amended — **0–0** (fail) · lower
- Passed — **51–5** (pass) · lower
- do pass — **0–0** (fail) · upper
- Passed — **25–3** (pass) · upper
- Passed — **17–11** (pass) · upper
- Passed — **0–0** (pass) · upper

## Sponsors

- Timothy "Tim" Dunn — primary (person)

## Timeline

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

- **2025-02-10** Senate First Reading `reading-1`
- **2025-02-11** DP `committee-passage`
- **2025-02-11** Senate Second Reading `reading-2`
- **2025-03-10** DP `informal-passage`
- **2025-03-13** PASSED `passage, reading-3`
- **2025-03-13** Transmit to House
- **2025-03-18** House First Reading. `reading-1`
- **2025-03-19** House Second Reading `reading-2`
- **2025-03-25** DPA/SE `amendment-passage`
- **2025-04-17** DPA `amendment-passage`
- **2025-04-28** PASSED `passage, reading-3`
- **2025-04-28** Transmit to Senate
- **2025-05-06** PASSED `passage`
- **2025-05-06** PASSED `passage`
- **2025-05-06** Transmit to Governor `executive-receipt`
- **2025-05-12** Signed by Governor `executive-signature`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/d88cc8e8-6ca0-4a0e-af2a-43ae9cda0d35`. Confidence: reported (aggregated from official Arizona legislature records).