DDW-2024-011531

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
March 9, 2023

Corbett Stephens
Woodland Hills City
200 South Woodland Hills
Woodland Hills, Utah 84653

Subject: System-Specific Minimum Sizing Standards
Woodland Hills City, System #25028, File #11933

Dear Corbett Stephens:

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 the Woodland Hills City water
system:

Peak Day Source Demand per ERC – 2,704 gal/day
Average Annual Demand per ERC – 396,694 gal/yr
Equalization Storage per ERC – 1,083 gal/day
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

The Woodland Hills City water system has 425 residential and 8 commercial connections serving
a population of approximately 1,480 people. The distribution system is supplied by two active
sources, Maple Canyon Well (WS005) and Broad Hollow Tank Well (WS006). The water system
has a 40% Share from the Maple Canyon Well (WS005). Salem City (UT25001) shares the
remaining production from the Maple Canyon Well (WS005). A gas chlorinator is installed near
the Maple Canyon Well (WS005). Well #1 North (WS004) and Well #2 South (WS002) are
inactive and there is no plan to refurbish these wells. There are five active storage tanks with a
total effective volume of 1,240,000 gallons. The storage tanks are supplied through two pump
stations.
Corbett Stephens
Page 2 of 3
March 9, 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
January 24, 2023. The Division allowed for 30 days for your water system to review the draft
system-specific minimum sizing. Your office replied on March 8, 2023, to verify the draft sizing
standards are representative. Therefore, the Division is setting system-specific minimum sizing
standard for the Woodland Hills 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 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 at 3,000 GPM for 3 hours based on information from Craig Northup,
Woodland Hills City Fire Chief, on January 24, 2023.

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.

Corbett Stephens
Page 3 of 3
March 9, 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 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]
Corbett Stephens, Woodland Hills City, [e-mail]
Chris Martin, Division of Drinking Water, [e-mail]
Craig Northup, Woodland Hills City, [e-mail]
Ted Black, Office of the State Fire Marshal, [e-mail]

DDW-2023-001484

Utah Department of Environmental Quality
Division of Drinking Water
Minimum Sizing Standards

Date Standard Effective: Wed Mar 08 10:37:48 MST 2023
Peak Day Source Demand per ERC (gal/day): 2,704
Average Annual Demand per ERC (gal/day): 396,694
Equalization Storage per ERC (gal/day): 1,083
WOODLAND HILLS CITY PWS ID: UTAH25028
Admin Name: CORBETT K STEPHENS
Address:
City, State, Zip: ,
Phone: [phone]
Email: [e-mail]
System Type: Community
Population: 1,480
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): 1,958
Max Average Annual Demand per ERC (gal/day): 295,599
Max Equalization Storage per ERC (gal/day): 808
x
x
x
(1 + 0.381)
(1 + 0.342)
(1 + 0.34)
=
=
=
2,704
396,693
1,082
DWRi WATER USE DATA REPORTED
Equalization per ERC (gal): 1,083
Existing Storage (gal): 1,240,000
ERCs: 517
Required Storage w/o Fire Flow: 559,911
Required Fire Storage (gal): 540,000
Required Storage w/Fire (gal): 1,099,911
Storage Deficiency: 0
Storage Deficiency (%): 0.0
No Storage Deficiency
Peak Day Source Demand per ERC (gpm): 1.88
Existing Source Capacity (gpm): 1,013
ERCs: 517
Required Resource Capacity (gpm): 972
Source Deficiency: 0
Source Deficiency (%): null
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 733,164 113,871,890.46 517 1,418 220,256 603 365
2021 961,260 116,569,936.74 491 1,958 237,414 650 365
2020 840,695 132,132,580.5 447 1,881 295,599 808 366
Variability:0.157 0.381 0.342 0.34
Year Peak Month Average
(gal/day)
Peak Month Average
per ERD (gal/day)
Ratio of PD/ERC to
Peak Month Avg/ERC
2022 673,880 1,303 1.09
2021 827,335 1,685 1.16
2020 800,121 1,790 1.05
CAPACITY CALCULATIONS FOR STORAGE
CAPACITY CALCULATIONS FOR SOURCES
SYSTEM STORAGE AND SOURCE INVENTORY
Storage ID Storage Name Effective Volume (GAL)
ST001 SMALL STEEL TANK 40,000
ST002 LARGE STEEL TANK 200,000
ST003 MAPLE CANYON TANK (40% OF 750,000 GAL)300,000
ST004 BROAD HOLLOW TANK 600,000
ST005 MAPLE COURT BOOSTER TANK 100,000
Storage Totals: 1,240,000 GAL
Source ID Source Name Flow Rate (GPM)
WS005 MAPLE CANYON WELL (40% SHARE)580
WS006 BROAD HOLLOW TANK WELL 433
Source Totals: 1,013 GPM