SB 1521 Arizona Senate · 57th Legislature - First Regular Session

unbuilt certificates; assured water supply

SB 1521 allows developers and landowners to transfer or sell unused water rights certificates (tied to undeveloped land) to other parcels within the same water basin, with specific conditions. It requires that the new parcel uses the water for the same purpose, meets construction deadlines (5 years outside master planned communities, 10 years inside), and notifies state officials. Municipal water providers can transfer these certificates freely within their service area, regardless of the original water source. This law directly affects developers purchasing or selling water rights for future construction projects in Arizona's designated water management areas.
Bill status signed all 5 stages cleared
Introduction
Feb 2025
Committee Review
Feb 2025
Senate Passage
May 2025
House Passage
Apr 2025
Signed into Law
May 2025
Introduced Feb 10, 2025 Signed May 12, 2025
Maddy AI version diff · 3 comparisons

What changed between versions

Senate Engrossed Version Chaptered Version · 3 edits
MINOR
The bill was converted from a Senate Engrossed Version to a Chaptered Version, meaning it has been officially enacted into law. The substantive content was completely replaced: the original text regarding groundwater management and unbuilt water supply certificates was removed, and new text was added that imposes a $100 penalty on the Town of Wellton for exceeding expenditure limitations in fiscal year 2022-2023.
Scope change
The bill's scope changed entirely from regulating groundwater certificate transfers to addressing a specific financial penalty for one municipality.
SCOPE

All provisions related to selling, transferring, or aggregating unbuilt certificates of assured water supply were removed from the enacted law.

ENFORCEMENT

A new penalty of $100 was established for the Town of Wellton for exceeding expenditure limitations in fiscal year 2022-2023.

TIMELINE

The act applies retroactively to June 30, 2022, and was approved by the Governor on May 12, 2025.

Floor votes · Senate May 6, 2025 · House Apr 28, 2025

How they voted

253
Passed · 2 other
Total votes 30
May 6, 2025
D Democratic13
9 Yea 2 Nay 2
69% Yea
R Republican17
16 Yea 1 Nay
94% Yea
Vote distribution
All Yea All Nay Mixed No data
Full legislative history

Actions timeline

Total actions
15
Key actions
8
Committee
1
Amendments
2
May 12, 2025
Signed into law
Signed by Governor
executive
May 6, 2025
Upper · Passed
PASSED
upper
Apr 28, 2025
Lower · Passed
PASSED
lower
Apr 17, 2025
Lower · Passed
DPA
lower
Mar 25, 2025
Lower · Passed
DPA/SE
lower
Mar 13, 2025
Upper · Passed
PASSED
upper
Mar 10, 2025
Upper · Passed
DP
upper
Feb 11, 2025
Upper · Passed
DP
upper
1 primary · 0 co-sponsors

Sponsors

Role
Legislator
Party
State
District
P
Photo of Tim Dunn
Tim Dunn
RRepublican
AZ
25