DDW-2024-009522

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 29, 2023

Joseph Hawkes
Logan City Water System
450 North 1000 West
Logan, Utah 84321

Subject: System-Specific Minimum Sizing Standards, 2023 Renewal
Logan City Water System, System #03010, File #11545

Dear Joseph Hawkes:

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 Logan City Water System:

Peak Day Source Demand (gal/day/ERC) – 1,424 gal/day/ERC
Average Annual Demand (gal/yr/ERC) – 259,028 gal/yr/ERC
Equalization Storage (gal/ERC) – 708 gal/ERC
Fire Storage (gal) – 3,240,000 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

Logan City Water System (the System) is a community water system located in Cache County.
The System serves a population of approximately 55,450 people based on 2022 data reported to
DWRi with about 9,410 residential and 1,094 commercial connections. The System currently
operates five active sources, four wells and one spring and seven storage tanks.
Joseph Hawkes
Page 2 of 3
June 29, 2023

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
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 April 3, 2023. Your office replied on June 7, 2023 to verify the draft sizing standards are
representative. Therefore, the Division is setting the system-specific minimum sizing standard for
Logan City Water System.

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 the Logan Fire Department on April 14, 2020.

Storage Capacity

Based on your system’s storage facilities and the storage minimum sizing requirement established
in this letter, your system is deficient in the minimum storage capacity requirements. A deficiency
of V031 will be added to the System’s IPS report due to lacking less than 20% of the required
storage capacity without taking into account the fire flow. This is a minor 15-point deficiency and
has no associated timeline to come into compliance. An updated IPS report is available at
https:\\waterlink.utah.gov. Please contact Jennifer Yee at [phone] or [e-mail] for
questions related to the System’s IPS report or deficiencies.

Joseph Hawkes
Page 3 of 3
June 29, 2023

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.

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

Sincerely,

Michael Newberry, P.E.
Engineering Manager

DZ/mrn/mdb

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

cc: Ben Harker, Bear River Health Department, [e-mail]
Joseph Hawkes, Logan City Water System, [e-mail]
Derek Holmstead, Logan City Water System, [e-mail]
Dani Zebelean, Division of Drinking Water, [e-mail]
Jennifer Yee, Division of Drinking Water, [e-mail]
Ted Black, Office of the State Fire Marshal, [e-mail]

DDW-2023-033489

Utah Department of Environmental Quality
Division of Drinking Water
Minimum Sizing Standards
Date Standard Effective: Wed Jun 28 10:45:05 MDT 2023
Peak Day Source Demand per ERC (gal/day): 1,424
Average Annual Demand per ERC (gal/year): 259,028
Equalization Storage per ERC (gal): 708
LOGAN CITY WATER SYSTEM PWS ID: UTAH03010
Admin Name: JOSEPH GLEN HAWKES
Address:
City, State, Zip: ,
Phone: [phone]
Email: [e-mail]
System Type: Community
Population: 48,174
MINIMUM SIZING STANDARD
MINIMUM SIZING STANDARD CALCULATIONS VARIABILITY
Data from these reporting years: 2020, 2021, 2022
Peak Day Source Demand per ERC (gal/day): 1,424
Average Annual Demand per ERC (gal/year): 259,028
Equalization Storage per ERC (gal): 708
x
x
x
(1 + 0.0)
(1 + 0.0)
(1 + 0.0)
=
=
=
1,424
259,028
708
DWRi WATER USE DATA REPORTED
Equalization per ERC (gal): 708
Existing Storage (gal): 11,400,000
ERCs: 19,322
Required Storage w/o Fire Flow: 13,679,976
Required Fire Storage (gal): 3,240,000
Required Storage w/Fire (gal): 16,919,976
Storage Deficiency: 5,519,976
Storage Deficiency (%): 0.0
Storage Deficiency
Peak Day Source Demand per ERC (gpm): 0.99
Existing Source Capacity (gpm): 23,151
ERCs: 19,322
Required Resource Capacity (gpm): 19,129
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/year)
Equaliza
tion
Storage
per ERC
(gal)
OP
Days
2022 21,946,852 4,108,133,897.4 19,322 1,136 210,113 576 365
2021 22,473,943 4,332,143,425.86 17,851 1,259 240,000 658 365
2020 24,685,918 4,554,960,339.66 17,335 1,424 259,028 708 366
Variability:0.115 0.0 0.0 0.0
Year Peak Month Average
(gal/day)
Peak Month Average
per ERD (gal/day)
Ratio of PD/ERC to
Peak Month Avg/ERC
2022 20,299,781 1,051 1.08
2021 20,716,975 1,161 1.08
2020 20,321,119 1,172 1.21
CAPACITY CALCULATIONS FOR STORAGE
CAPACITY CALCULATIONS FOR SOURCES
SYSTEM STORAGE AND SOURCE INVENTORY
Storage ID Storage Name Effective Volume (GAL)
ST001 GOLF COURSE 3 1,000,000
ST002 GOLF COURSE 4 1,000,000
ST003 CASTLE HILL RESERVOIR 500,000
ST004 QUAIL BLUFF RESERVOIR 250,000
ST005 CLIFF SIDE RESERVOIR 1,000,000
ST006 G C RES 6-9 (4 CELLS)5,650,000
ST007 HILLCREST RESERVOIR 2,000,000
Storage Totals: 11,400,000 GAL
Source ID Source Name Flow Rate (GPM)
WS002 CROCKETT AVE#1 WELL 5,400
WS003 200 E CENTER WELL 5,000
WS004 700 N 600 E WELL 3,400
WS005 WILLOW PARK WELL 4,000
WS001 DEWITT SPRING 5,351.1
Source Totals: 23,151 GPM