DDW-2025-002010

Utah Department of Environmental Quality
Division of Drinking Water
Minimum Sizing Standards
Date Standard Effective: Mon Mar 03 09:57:52 MST 2025
Peak Day Source Demand per ERC (gal/day): 1,265
Average Annual Demand per ERC (gal/day): 187,994
Equalization Storage per ERC (gal/day): 515
DUCHESNE COUNTY UPPER COUNTRY WID PWS ID: UTAH07059
Admin Name: KIRK L CHRISTENSEN
Address: PO BOX 406
City, State, Zip: Altamont, Utah 84001
Phone: [phone]
Email: [e-mail]
System Type: Community
Population: 2,100
MINIMUM SIZING STANDARD
MINIMUM SIZING STANDARD CALCULATIONS VARIABILITY
Data from these reporting years: 2018, 2019, 2020, 2021,
2022, 2023
Peak Day Source Demand per ERC (gal/day): 1,265
Average Annual Demand per ERC (gal/year): 187,994
Equalization Storage per ERC (gal): 515
x
x
x
(1 + 0.0)
(1 + 0.0)
(1 + 0.0)
=
=
=
1,265
187,994
515
DWRi WATER USE DATA REPORTED
Equalization per ERC (gal): 515
Existing Storage (gal): 2,500,000
ERCs: 884
Required Storage w/o Fire Flow: 455,260
Required Fire Storage (gal): 120,000
Required Storage w/Fire (gal): 575,260
Storage Deficiency: 0
Storage Deficiency (%): 0.0
No Storage 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
2023 993,015 166,213,336.59 884 1,123 168,395 461 365
2022 989,240 167,705,734.17 881 1,123 172,029 471 365
2021 936,621 170,609,066.58 883 1,060 174,459 478 365
2020 1,112,356 183,894,011.85 879 1,265 187,833 513 366
2019 975,723 168,556,205.28 963 1,013 156,909 430 365
2018 985,566 191,082,284.91 910 1,083 187,994 515 365
Variability:0.096 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
2023 821,249 929 1.21
2022 610,287 693 1.62
2021 738,525 836 1.27
2020 752,610 856 1.48
2019 680,187 706 1.43
2018 783,408 861 1.26
CAPACITY CALCULATIONS FOR STORAGE
CAPACITY CALCULATIONS FOR SOURCES
Peak Day Source Demand per ERC (gpm): 0.88
Existing Source Capacity (gpm): 1,857
ERCs: 884
Required Source Capacity (gpm): 778
Source Deficiency: 0
Source Deficiency (%): 0.0
No Source Deficiency
SYSTEM STORAGE AND SOURCE INVENTORY
Storage ID Storage Name Effective Volume (GAL)
ST001 ALTONAH TANK 500,000
ST002 MOUNTAIN HOME TANK 500,000
ST003 ALTAMONT TANK 100,000
ST004 CLAY BASIN TANK 150,000
ST005 BLUEBELL TANK 50,000
ST006 ALTAMONT TANK #2 400,000
ST007 BLUEBELL TANK #2 400,000
ST008 TALMAGE TANK 400,000
Storage Totals: 2,500,000 GAL
Source ID Source Name Flow Rate (GPM)
WS001 UTAH07006 JOHNSON WATER DISTRICT 310
WS002 UPPER SPRING 515.97
WS003 LOWER COW CANYON SPRING 2 515.97
WS004 LOWER COW CANYON SPRING 3 515.97
Source Totals: 1,857 GPM