DDW-2024-011615

195 North 1950 West • Salt Lake City, UT
Mailing Address: P.O. Box 144830 • Salt Lake City, UT 84114-4830
Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.utah.gov
Printed on 100% recycled paper
State of Utah

Department of
Environmental Quality

Kimberly D. Shelley
Executive Director

DIVISION OF DRINKING WATER
Tim Davis
Director

SPENCER J. COX
Governor

DEIDRE HENDERSON
Lieutenant Governor
June 5, 2023

Cameron Phillips
Payson City
439 West Utah Avenue
Payson, Utah 84651

Subject: System-Specific Minimum Sizing Standards
Payson City, System #25021, File #13381

Dear Cameron Phillips:

Based on the water use data submitted to the Division of Water Rights (DWRi), the following
system-specific minimum sizing standards have been set for Payson City water system:

Peak Day Source Demand – 634 gal/day/ERC
Average Annual Demand – 117,142 gal/yr/ERC
Equalization Storage – 320 gal/ERC
Fire Storage – 1,280,000 gal

These standards are effective as of the date of this letter. A summary of the water use data and
calculations used to set the minimum sizing standards are attached for your reference. The
Division plans to evaluate these standards every 3 years, or upon request.

Water System Background

Payson is a public water system currently serving approximately 22,725. Several sources supply
the distribution system, including three wells, six springs, and one consecutive connection. The
sources feed into four active storage tanks. The Payson City water system also has a pressurized
irrigation system and other sources that supply water for outdoor irrigation.

Minimum Sizing Standard Background

Per Utah Code 19-4-114, the information needed for the Division of Drinking Water (the
Division) to set system-specific minimum sizing standards may be based on water use data
submitted to the DWRi, or alternatively, a community water system can submit an engineering
Cameron Phillips
Page 2 of 3
June 5, 2023

study to the Division if the water system’s water use data is not representative of future use or the
water system does not yet have actual water use data.

Actual water use data was available through DWRi, and an engineering study was not submitted
to the Division for review. Therefore, the Division analyzed the submitted DWRi water use data
and sent a draft summary of the resulting system-specific minimum sizing standards to your office
on May 15, 2023. The Division allowed time for your water system to review the draft system-
specific minimum sizing. Your office replied on May 30, 2023, to verify the draft sizing standards
are representative. Therefore, the Division is setting the system-specific minimum sizing standard
for Payson City water system.
The calculated variability for the peak day source demand was originally 31%. This was revised to
20% as allowed by Division policy.
Water Use Data Definitions

Peak Day Source Demand is the total flow into a public water system to meet the demand of the
water system on the day of the highest water consumption in a calendar year.

Average Annual Demand is the total quantity of drinking water flowing into a public water system
within a calendar year.

Total Equivalent Residential Connections (ERCs) term represents the number of residential
service connections and the number of equivalent residential connections for non-residential
connections (commercial, industrial, institutional connections).

Minimum Equalization Storage requirement is a volume that is equivalent to the amount of water
needed to meet the average day culinary demand for public water systems. Equalized storage per
ERC is calculated by dividing the Average Annual Demand per ERC data by the number of
operational days in a year.

Fire Storage was set based on information from you provided from the Local Fire Authority on
April 20, 2020. No change to the fire flow was noted as part of the draft summary review.

Storage Capacity

Based on your system’s storage facilities and the storage minimum sizing requirement established
in this letter, your system is compliant with the minimum storage capacity requirements.

Source Capacity

The Division has documentation of established safe yields for all of your system sources. Using
total system-wide safe yields and the source minimum sizing requirement established in this letter
indicates your water system is compliant with minimum source capacity requirements.

Cameron Phillips
Page 3 of 3
June 5, 2023

If you have any questions regarding this letter, please contact Chris Martin, of this office, at
[phone], or Michael Newberry, Engineering Manager, at [phone].

Sincerely,

Michael Newberry, P.E.
Engineering Manager

CM/mrn/mdb

Enclosures
1. Utah Department of Environmental Quality Division of Drinking Water Minimum Sizing Standards
Summary Report

cc: Jason Garrett, Utah County Health Department, [e-mail]
Cameron Phillips, Payson City, [e-mail]
Travis Jockumsen, Payson City, [e-mail]
Chris Martin, Division of Drinking Water, [e-mail]
Brent Arns, Division of Drinking Water, [e-mail]
Scott Spencer, [e-mail]
Ted Black, Office of the State Fire Marshal, [e-mail]

DDW-2023-009904

Utah Department of Environmental Quality
Division of Drinking Water
Minimum Sizing Standards
Date Standard Effective: Thu Jun 01 09:37:21 MDT 2023
Peak Day Source Demand per ERC (gal/day): 635
Average Annual Demand per ERC (gal/yr): 117,142
Equalization Storage per ERC (gal/day): 321
PAYSON CITY WATER SYSTEM PWS ID: UTAH25021
Admin Name: CAMERON PHILLIPS
Address:
City, State, Zip: ,
Phone: [phone]
Email: [e-mail]
System Type: Community
Population: 19,000
MINIMUM SIZING STANDARD
MINIMUM SIZING STANDARD CALCULATIONS VARIABILITY
Data from these reporting years: 2020, 2021, 2022
Max Peak Day Source Demand per ERC (gal/day): 529
Max Average Annual Demand per ERC (gal/yr): 97,945
Max Equalization Storage per ERC (gal/day): 268
x
x
x
(1 + 0.2)
(1 + 0.196)
(1 + 0.196)
=
=
=
634
117,142
320
DWRi WATER USE DATA REPORTED
Equalization per ERC (gal): 321
Existing Storage (gal): 5,606,000
ERCs: 12,686
Required Storage w/o Fire Flow: 4,072,206
Required Fire Storage (gal): 1,280,000
Required Storage w/Fire (gal): 5,352,206
Storage Deficiency: 0
Storage Deficiency (%): 0.0
No Storage Deficiency
Peak Day Source Demand per ERC (gpm): 0.44
Existing Source Capacity (gpm): 6,573
ERCs: 12,686
Required Resource Capacity (gpm): 5,582
Source Deficiency: 0
Source Deficiency (%): 0.0
No Source Deficiency
Year Peak
Day
Source
Demand
(gal/day)
Average
Annual
Demand
(gallons)
ERCs Peak
Demand
per ERC
(gal/day)
Avg
Annual
Demand
per ERC
(gal/day)
Equaliza
tion
Storage
per ERC
(gal/day)
OP
Days
2022 6,125,998 1,135,277,918.04 11,591 529 97,945 268 365
2021 5,519,915 1,039,008,498.6 12,686 435 81,902 224 365
2020 5,099,568 1,101,135,250.26 12,651 403 87,040 238 366
Variability:0.094 0.2 0.196 0.196
Year Peak Month Average
(gal/day)
Peak Month Average
per ERD (gal/day)
Ratio of PD/ERC to
Peak Month Avg/ERC
2022 3,709,053 320 1.65
2021 3,137,840 247 1.76
2020 3,835,371 303 1.33
CAPACITY CALCULATIONS FOR STORAGE
CAPACITY CALCULATIONS FOR SOURCES
SYSTEM STORAGE AND SOURCE INVENTORY
Storage ID Storage Name Effective Volume (GAL)
ST003 0.6 MG CONCRETE TANK 600,000
ST004 RUSH FLAT 6K PLASTIC TANK 6,000
ST005 2.5 MG NORTH TANK 2,500,000
ST006 2.5 MG SOUTH TANK 2,500,000
Storage Totals: 5,606,000 GAL
Source ID Source Name Flow Rate (GPM)
WS010 WELL #1 875
WS011 WELL #2 1,600
WS014 WELL #4 1,800
WS015 WELL #5 1,100
WS001 WATERCRESS SPRING 461.1
WS017 GLADSTAN WELL 737
Source Totals: 6,573 GPM