Back to Arizona

HB4100 • 2026

municipal water providers; notice; rates

HB4100 - municipal water providers; notice; rates

Energy
Passed Legislature

This bill passed both chambers and reached final enrollment, even if later executive action is not shown here.

Sponsor
Alexander Kolodin
Last action
2026-02-12
Official status
House second read
Effective date
Not listed

Plain English Breakdown

The bill specifies that it ends from and after December 31, 2026, not January 1, 2027 as stated in the candidate explanation.

Water Providers Must Notify Customers About Rate Increases

HB4100 requires municipal water providers who receive water from the Central Arizona Project to notify customers about potential rate increases if they lose all their CAP water.

What This Bill Does

  • Requires municipal water providers that get water from the Central Arizona Project (CAP) to estimate how much it would cost to find a new water source if they lost all of their CAP water by April 15, 2026.
  • Mandates these providers to inform customers about potential rate increases due to losing CAP water by April 15, 2026.
  • Specifies that the notice must include details like percentage and dollar amounts for typical residential customers.
  • Requires providers to send out notices through mail, newspapers, and their websites.

Who It Names or Affects

  • Municipal water providers who receive or have an allocation of water from the Central Arizona Project (CAP).
  • Customers of these municipal water providers.

Terms To Know

Central Arizona Project (CAP)
A system that delivers Colorado River water to central and southern Arizona.
Municipal provider
An organization that supplies water to a city or town.

Limits and Unknowns

  • The bill does not specify what happens if providers do not comply with the notice requirements.
  • It is unclear how many municipal providers will be affected by this requirement.

Amendments

These notes stay tied to the official amendment files and metadata from the legislature.

Plain English: Fifty-seventh Legislature Natural Resources, Energy & Water Second Regular Session H.B.

  • Fifty-seventh Legislature Natural Resources, Energy & Water Second Regular Session H.B.
  • 4100 PROPOSED HOUSE OF REPRESENTATIVES AMENDMENTS TO H.B.
  • 4100 (Reference to printed bill) The bill as proposed to be amended is reprinted as follows: 1 Section 1.
  • City, town or private water providers; central 2 Arizona project subcontracts; rates; notice; 3 delayed repeal 4 A.
  • This amendment summary is using official source text because generated interpretation was skipped for this run.

Bill History

  1. 2026-02-12 House

    House second read

  2. 2026-02-11 House

    House Rules: None

  3. 2026-02-11 House

    House Natural Resources, Energy & Water: FAILED

  4. 2026-02-11 House

    House first read

Official Summary Text

HB4100 - 572R - House Bill Summary

ARIZONA HOUSE OF REPRESENTATIVES

57th
Legislature, 2nd Regular Session

Majority Research Staff

HB4100
:
municipal water providers; notice; rates

Sponsor:
Representative Kolodin, LD 3

Committee
on Natural Resources, Energy & Water

Overview

An
emergency measure that directs a municipal provider that receives water from
the Central Arizona Project (CAP) to notify customers as outlined of the
potential increase of their water rates as a result of losing 100% of the water
provided by the CAP.

History

In 1968, the CAP was established by the
Colorado River
Basin Project Act
to deliver 1.5 million acre-feet of Colorado
River to the most populous areas of the state and reduce the use of groundwater
for agriculture and other activities. The CAP water is used by cities, water
utilities, agricultural districts and Native American communities throughout
central and southern Arizona.

In 1971, the Central Arizona Water Conservation District
(CAWCD), a special taxing district, was created to provide Arizona a means to
repay the federal government for the reimbursable costs of construction and to
manage and operate the physical system. The price of water is determined
annually by the CAWCD Board of Directors based on projections of energy,
operation, maintenance and replacement costs (
CAP
)(
Arizona State Library
).

Provisions

1.

Requires a
municipal provider, by April 15, 2026, that receives or has an allocation of
water from the CAP pursuant to a subcontract with the CAWCD or a lease with
another person or subcontract to:

a.

estimate the
total cost per acre-foot of securing, treating and delivering an alternative
water supply if 100% of the water acquired or leased from the CAP is no longer
available; and

b.

provide
public notice to each customer of the potential increase in rates resulting
from losing 100% of the water from CAP. (Sec. 1)

2.

Mandates
that the notice be in the same form and manner as the public notices required
of public service corporations in rate cases by the Arizona Corporation
Commission. (Sec. 1)

3.

Requires the
notice include:

a.

the
potential revenue increase levels for each customer class, in percent;

b.

the
potential monthly bill increase for a typical residential water customer that
are served by a five-eighths inch meter with an average monthly usage; and

c.

the typical
current bill, potential bill, potential dollar increase and potential
percentage increase. (Sec. 1)

4.

Instructs a
municipal provider, by April 15, 2026, to:

a.

mail the
notice as a bill insert or a separate mailing to each of its customers in each
affected service area;

b.

publish the
notice at least once in a newspaper in each affected service area; and

c.

post the
notice in a prominent location on its website. (Sec. 1)

5.

Repeals this
legislation on January 1, 2027. (Sec. 1)

6.

Defines
municipal
provider
. (Sec. 1)

7.

Contains an
emergency clause. (Sec. 2)

8.

9.

10.

---------- DOCUMENT
FOOTER ---------

11.

Initials CW��������������������� HB
4100

12.

2/15/2026� Page 0 Natural
Resources, Energy & Water

13.

14.

---------- DOCUMENT
FOOTER ---------

Current Bill Text

Read the full stored bill text
HB4100 - 572R - I Ver

REFERENCE TITLE:
municipal water providers; notice; rates

State of Arizona

House of Representatives

Fifty-seventh Legislature

Second Regular Session

2026

HB 4100

Introduced by

Representative
Kolodin

AN
ACT

PROVIDING for notice of a potential water
rate increase.

(TEXT OF BILL BEGINS ON NEXT PAGE)

Be it enacted by the Legislature of the State of Arizona:

Section 1.
Municipal
providers; central Arizona project subcontracts; rates; notice; delayed repeal;
definitions

A. On or before April 15,
2026, each municipal provider that receives or has an allocation of water from
the central Arizona project pursuant to a subcontract with the central Arizona
water conservation district organized under title 48, chapter 22, Arizona
Revised Statutes, or that receives or has an allocation of water from the
central Arizona project pursuant to a lease with another person or subcontract
with the central Arizona water conservation district shall do both of the
following:

1. Estimate the total cost
per acre-foot of securing, treating and delivering an alternative water supply
if one hundred percent of the water that is acquired or leased directly or
indirectly from the central Arizona project is no longer available.

2. Provide public notice to
each customer of the potential increase in rates resulting from losing one
hundred percent of the water that is acquired or leased directly or indirectly
from the central Arizona project.� The notice shall be in substantially the
same form and manner as the public notices required of public service
corporations in rate cases by the corporation commission and shall include the
following information:

(
a
)
The potential revenue increase levels for each
customer class, in percent.

(
b
)
The potential monthly bill increase for a
typical residential water customer that are served by a five-eighths inch meter
with an average monthly usage.

(
c
) T
he typical current bill, potential bill, potential dollar
increase and potential percentage increase.

B. On or before April 15,
2026, a municipal provider that is subject to this section shall do all of the
following:

1. Mail to each of its
customers in each affected service area a copy of the notice required pursuant
to this section as a bill insert or as a separate mailing.

2. Cause a copy of the
notice required pursuant to this section to be published at least once in a
newspaper of general circulation in each affected service area.

3. Post a copy of the
notice required pursuant to this section in a prominent location on its
website.

C. This section is repealed
from and after December 31, 2026.

D. For the purposes of this
section, "municipal provider" has the same meaning prescribed in
section 45-561, Arizona Revised Statutes.

Sec. 2.
Emergency

This act is an emergency measure that
is necessary to preserve the public peace, health or safety and is operative
immediately as provided by law.