Attachment B - SW Excise Tax Increase Report_230407.pdf

City of Phoenix — Formal (2023-06-28)

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Stormwater Excise Tax Proposed Increase 
Information Report  
April 7, 2023
Introduction 
The City of Phoenix (City) owns and operates a Phase I Municipal Separate Storm 
Sewer System (MS4) under a permit issued by the Arizona Department of 
Environmental Quality (ADEQ) under the federal Clean Water Act, 33 U.S.C. §§ 1251 et 
seq. This MS4 permit is required under federal and state law because discharges to 
protected surface waters are highly regulated. The City is required to comply with the 
terms of the MS4 permit.  
To protect water quality and minimize the discharge of pollutants, the City established a 
comprehensive, multi-departmental Stormwater Management Program (Program) to 
adhere to the City’s MS4 permit requirements. This effort includes but is not limited to:  
•
Maintaining legal authority to control discharges
•
Regulating discharges associated with industrial activity
•
Controlling discharge of pollutants from construction activity
•
Prohibiting and investigating illicit discharges and illegal dumping
•
Controlling spills, dumping, and disposal of materials other than stormwater
•
Conducting inspections and monitoring to determine permit compliance
•
Public education and outreach
•
Employee training
•
Compliance administration, reporting, and enforcement
The Program is supported by a Stormwater Excise Tax (Tax) that has been in place 
since 1993 and is currently codified in Phoenix City Code Section 37-65(B). The City is 
proposing an increase to the Tax for all City water service accounts. This increase is 
primarily the result of new and expanded permit requirements from the City’s latest MS4 
permit, which became effective July 1, 2021.  
ATTACHMENT B

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Excise Tax Summary 
The Tax is levied monthly on the City Services Bill under the header “State and Other 
Taxes.” This line item also includes a State of Arizona tax, a Maricopa County freeway 
tax, a jail tax, and a Hazardous Waste Disposal Tax. An example is provided below. 
Figure 1 – Phoenix City Services Bill Example 
Background on Excise Tax 
In 1993, the Tax was established to defray the costs associated with the US 
Environmental Protection Agency (EPA) issued MS4 permit and mandated Program 
(Ordinance G-3651). All single-family residential City Services bills were assessed 
$0.15 per month. All other water accounts were charged a graduated rate by meter size 
using the equivalent dwelling unit methodology.   
The Phoenix City Council approved an increase to implement revisions to the Program 
after the issuance of a new permit in 1997 (Ordinance G-4029). The single-family rate 
increased from $0.15 to $0.20 per month. All other water accounts continued to be 
charged a graduated rate by meter size using the equivalent dwelling unit methodology.

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Based on EPA and ADEQ review, it was evident that the current funding structure was 
insufficient to implement the existing permit requirements and expanded 2009 MS4 
permit requirements. The city completed an extensive review of the Program, calculated 
operating costs, and researched comparable city fees for stormwater programs. In 
2010, City Council approved a third increase in 17 years to cover new positions and an 
additional $3.0 million in operating expenses (Ordinance G-5491).  
The single-family monthly rate was established at $0.70 per month and intended to be 
sufficient until the next ADEQ permit was issued. 
Table 1: Summary of Excise Tax (1993 to Present) 
Water Meter Size 
(Inches)
1993 
1997 
2010 - Current 
5/8"*
$ 0.15
$ 0.20
$ 0.70
3/4"*
$ 0.15
$ 0.20
$ 0.70
1"
$ 0.38
$ 0.51
$ 1.46
1.5"
$ 0.75
$ 1.00
$ 3.50
2"
$ 1.20
$ 1.60
$ 4.85
3"
$ 2.25
$ 3.00
$ 12.80
4"
$ 3.75
$ 5.00
$ 19.75
6"
$ 7.50
$ 10.00
$ 30.00
*5/8" and 3/4" water meters are typical single family residence water meter sizes
New Permit Requirements 
A new permit was issued in January 2021 and became effective on July 1, 2021. The 
new MS4 Permit requires the implementation of new programs and practices and the 
expansion of existing program elements. New and expanded elements of the Program 
include: a new stormwater post-construction control program, retrofit feasibility study, 
increased public outreach requirements, expanded inspection and monitoring 
requirements, and expanded reporting and mapping requirements. 
Non-compliance by the city with the MS4 permit would result in notices of violations, 
significant fines, and civil penalties up to $25,000 per day per violation from ADEQ and 
the EPA. Other cities across the country who have failed to comply with their stormwater 
permit have ended up operating under a consent decree, and consequently more 
stringent and inflexible requirements.  
The current Tax is not sufficient to implement the new and expanded permit 
requirements, therefore an increase to cover the expenses of those requirements must 
be pursued. 
Proposed Increase 
Single-family home residential customers would have an increase of $0.25 per month, 
which adds up to $3.00 per year. All other water account increases are calculated at a 
graduated rate by meter size using the equivalent dwelling unit methodology, in 
accordance with the current tax structure.

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Table 2: Proposed Excise Tax Increase  
 
 
 
 
 
 
 
 
 
 
 
The cost of the new and expanded MS4 permit elements was calculated via a multi-step 
process. First, the framework for the new stormwater post-construction program 
required by the permit had to be developed. Once the framework was established, a 
reasonable estimate of program costs could then be calculated.  
The current Program and expanded elements that are covered by the existing Tax were 
evaluated. Only those elements not currently supported by the existing Tax were 
evaluated for additional cost projection. The current number of projects and facilities 
being reviewed by the City were identified, along with the most recent estimated growth 
rate to forecast cost over time for these Program elements. The increase in education 
and outreach, inspections, and reporting requirements were evaluated against current 
and historic staff loads to identify additional personnel needs and levels. In addition, a 
cost evaluation of the storm system management improvements was completed. 
Staff is confident that all reasonably foreseeable costs of the new and expanded 
Program elements have been captured by the Tax analysis, including forecasted 
estimates for cost escalations of equipment, supplies, personnel, database upgrades 
and support.  
The City has worked to minimize the costs of new and expanded permit requirements in 
a variety of ways. For example:  
• Although there are many locations for which local flooding and drainage 
concerns need to be investigated, the Tax increase limits the support to an 
investigation of up to 10 locations annually. Limiting this number allows the city to 
keep the Tax increase minimized. Expanding this investigation to more locations 
could occur if a proportional increase in the Tax were approved.

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• The new stormwater post-construction program is being developed to avoid 
unnecessary implementation expenses in multiple ways, including utilizing 
existing programs and procedures wherever possible; siting the program in the 
Planning and Development Department to capitalize on existing expertise and 
plan review functions; and emphasizing owner-led inspections and submittal of 
compliance documentation to reduce program costs and minimize the tax 
increase.    
  
These additional Program resources will enable the City to maintain compliance with the 
ADEQ-issued MS4 permit and will alert City staff on the status of the storm system to 
proactively, rather than reactively, identify and address concerns.  
 
The tax will be used to implement these actions that are currently unfunded. It is 
estimated to supply a total of approximately $2 Million in additional revenue annually 
needed for the Program elements detailed in Table 3 below.  
 
Table 3: Permit Requirements and Needed Resources  
Department 
MS4 Permit Actions and 
Programs 
New Resources 
Average Annual 
Financial Impact 
Planning & 
Development 
Develop and implement the 
new permit-required 
program to inventory, track, 
inspect and confirm 
adequate maintenance of 
post-construction 
stormwater controls for all 
private and public 
development and 
redevelopment projects. 
• 5 new positions (phased 
in over 4 years) 
• Equipment, supplies, and 
database development  
• Training development and 
education/outreach to 
owners of post-
construction controls 
• Contractual services 
$900,000 
Water Services
Support expanded permit 
requirements including 
public outreach messaging 
and program modification, 
increased reporting of non-
filers and wet weather 
monitoring, stormwater 
management plan updates, 
tracking and reporting. 
• 2 new positions  
• Database development, 
maintenance, and support 
 
$300,000

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Department 
MS4 Permit Actions and 
Programs 
New Resources 
Average Annual 
Financial Impact 
Street 
Transportation 
Improve efficiency and 
effectiveness related to 
storm drain evaluation and 
maintenance.  
• Develop storm drain asset 
management program  
• Support a citywide storm 
system assessment  
• Perform up to 10 site 
evaluations annually of 
local drainage issues.  
$ 800,000 
 
City Comparisons 
A review of similar cities with Phase I MS4 permits (including Mesa, Scottsdale, 
Oklahoma City, San Antonio, and Austin) shows current residential storm water taxes 
and fees ranging from $3.75 to $18.06/month. Of the cities investigated, the closest 
equivalents to Phoenix for activities are Scottsdale, AZ, Mesa, AZ, San Antonio, TX, 
and Oklahoma City, OK. These cities have monthly residential stormwater fees or taxes 
ranging from $3.75 to $14.95/month. Oklahoma City rates increase by meter size and 
go up to $658.92/month. City of Scottsdale, AZ has a flat stormwater fee of $6.10 for all 
customers that supports stormwater and capital drainage and flood control projects. City 
of Mesa has a flat environmental fee of $7.32 that supports stormwater, dust, and 
hazardous waste activities. 
Graph 1: Comparable Phase I MS4 Cities 
 
 
 
0.7
7.32
6.1
5.69
3.75
0.95
0
1
2
3
4
5
6
7
8
Phoenix, AZ
Mesa, AZ
Scottsdale, AZ
Oklahoma City,
OK
San Antonio, TX
Dollars Per Month
Comparable Phase I MS4 Cities
Current Residential Stormwater Fees 
Current Rate
Proposed Rate

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Public Outreach  
The city plans to conduct public outreach through virtual and in-person community 
meetings, social media, and online outreach. Below is a schedule of meetings and 
opportunities to learn more about the proposed Tax increase.  
 
Table 4: Schedule  
Month
Activity
February 15, 2023  
Notify Transportation and Infrastructure (TIP) Subcommittee  
March 2023
Initiate Public Outreach 
March - May, 2023 
Village Planning Committee Meetings  
(Water Rate and Stormwater Tax Joint Meeting)
April 18, 2023 
City Council Policy Meeting  
April – May  
Virtual Public Meetings  
(Water Rate and Stormwater Tax Joint Meeting) 
April – May  
In-Person Public Meetings  
(Water Rate and Stormwater Tax Joint Meeting)
May 16, 2023
Publish Notice of Intent with City Clerk and Public Venues 
June 2023
Formal Phoenix City Council Meeting for Approval
July - Sept 2023
Public Notification
October 1, 2023
Tax increase goes into effect if approved 
 
Public information on the proposed increase, along with the outreach schedule are 
available at https://www.phoenix.gov/public-notice-tax-and-fee-changes.  
Any questions or comments about the excise tax increase can be sent to 
Wsd.esd.outreach@phoenix.gov and include the term “SW Excise Tax” in the subject 
line. Staff will respond to any questions posed.