DDW-2025-004621

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

GARY R. HERBERT
Governor

SPENCER J. COX
Lieutenant Governor
Department of
Environmental Quality

L. Scott Baird
Executive Director

DIVISION OF DRINKING WATER
Marie E. Owens, P.E.
Director

April 29, 2020

S. Scott Christiansen
Hooper Water Improvement District
5555 West 5500 South
Hooper, Utah 84315

Subject: System-Specific Minimum Sizing Standards
Hooper Water Improvement District, System #29006, File #11500

Dear Mr. Christiansen:

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 Hooper Water Improvement
District:

Peak Day Source Demand (gal/day/ERC) – 731 gal/day/ERC
Average Annual Demand (gal/yr/ERC) – 125,717 gal/yr/ERC
Equalization Storage (gal/ERC) – 345 gal/ERC
Fire Storage (gal) – 540,000 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 is attached for your reference. The
Division plans to evaluate these standards every 3 years, or upon request.

Water System Background

Hooper Water Improvement District is a public community water system that services a full-time
population of approximately 19,524.

S. Scott Christiansen
Page 2
April 29, 2020

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 January 28, 2020. Your office replied on April 28, 2020 to verify the draft sizing
standards are representative; therefore, the Division is setting system-specific minimum sizing
standard for Hooper Water Improvement District.

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 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 Local Fire Authority on April 22, 2020.

Storage Capacity

Based on your systems 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 is missing source safe yield documentation for one of your water sources. A safe
yield is based on three years of source daily flow data for a spring [R309-515-7(5)(b)] and an
aquifer drawdown test for a well [R309-515-6(10)(c)]. Work with the Division to get these
source safe yields established so that an accurate source capacity analysis can be done.
S. Scott Christiansen
Page 3
April 29, 2020

If you have any questions regarding this letter, please contact Lisa Nelson, of this office, at
[phone], or Nathan Lunstad, Engineering Manager, at [phone]. 

Sincerely,

Nathan Lunstad, P.E.
Engineering Manager

LCN/nl/mdb

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

cc: Michela Harris, Environmental Health Director, Weber-Morgan Health Dept., [e-mail]
Michelle Cooke, Weber-Morgan Health Dept., [e-mail]
S.Scott Christiansen, Hooper Water ID, [e-mail]
Cole Allen, Office Manager, Hooper Water ID, [e-mail]
Lisa Nelson, Division of Drinking Water, [e-mail]
Coy Porter, Office of the State Fire Marshal, [e-mail]

DDW-2020-010396.docx
UTAH29006 HOOPER WATER IMPROVEMENT DISTRICT PWS ID:
CHRISTIANSEN, STEVEN SCOTT
1620 W 525 N
WEST POINT, UT 84015
Phone: [phone]
Emergency Phone:
Population:19,524
System Type:Community
[e-mail]
Utah Department of Environmental Quality
Division of Drinking Water
Minimum Sizing Standards
Peak Day Source Demand Per ERC (gal/day):731
Average Annual Demand Per ERC (gal/year):125,717
Equalization Storage Per ERC (gal/day):345
Date Standard Effective:04/28/2020
MINIMUM SIZING STANDARD
MINIMUM SIZING STANDARD CALCULATIONS
Max Peak Day Source Demand Per ERC (gal/day):625
Max Average Annual Demand Per ERC (gal/day):103,898
Max Equalization Storage Per ERC (gal/day):285
Data from these reporting years:2016 to 2018
17%
21%
21%
Variability
Factor
731
125,717
345
x
x
x
=
=
=
DWRi WATER USE DATA REPORTED
Data Year Peak Day
Source
Demand
(gal/day)
ERCsAverage
Annual
Demand
(gallons)
Op
Days
Peak Demand
per ERC
(gal/day)
Avg Annual
Demand per ERC
(gal/year)
Equalization
Storage per ERC
(gal/day)
2018 3,651,350 5,846607,390,317 625 103,898 285 365
2017 3,366,432 6,315552,672,349 533 87,517 240 365
2016 4,009,000 6,600565,078,342 607 85,618 235 365
21%17%13% Variability
Data Year Peak Month
Average
(gal/day)
Ratio of
PD/ERC to
Peak
Month
Avg/ERC
Peak Month Average
per ERC
(gal/day)

2018 2,736,738 468 1.3
2017 2,585,711 409 1.3
2016 3,216,094 487 1.2
SYSTEM STORAGE AND SOURCE INVENTORY
CAPACITY CALCULATIONS FOR STORAGE
SYSTEM STORAGE DETAILS
ST003 4000 S TANK 750,000 GAL
ST001 2 MG SOUTH TANK 2,000,000 GAL
ST002 2 MG NORTH TANK 2,000,000 GAL
ST004 WELL #1 120,000 GALLON TANK 120,000 GAL
4,870,000Storage Totals:GAL
SYSTEM SOURCE DETAILS
WS001 WELL #1 5450 SOUTH 0 GPM
WS004 WELL #3 1800 N 4200 W 1,500 GPM
WS005 WELL #2 4000 SOUTH 2,350 GPM
3,850Source Totals: GPM
STORAGE CALCULATION
0 0.0%
No Storage Deficiency
Storage Deficiency:
ERCs:5,846
Required Storage w/o Fire Flow (gal):2,016,870
Required Fire Storage (gal)540,000
Required Storage w/Fire (gal)2,556,870
Equalization Storage per ERC (gal):345
Existing Storage (gal):4,870,000