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FEMP provides water use indices as a guide for Federal agencies. Note that each is a rough estimate of water usage at different types of sites. Your site may vary considerably.

The following indices should be used only to assist in determining baseline data when no other information is available on site water usage.

Conversion factors for the Federal water use indices are also available.

Source: American Water Works Association 1996. Data represents gallons per unit per day.

Commercial

UserUnitRangeTypical
AirportPassenger4-53
Apartment housePerson100-200100
Boarding housePerson25-5040
HotelGuest40-6050
Employee8-1310
Lodging house and tourist homeGuest30-5040
MotelGuest25-4035
Motel with kitchenGuest25-6040
Laundry (self-service)Machine400-650550
OfficeEmployee8-2015
Public LavatoryUser3-65
Restaurant (including toilet)
ConventionalCustomer8-109
Short-orderCustomer3-88
Parking Space1-38-13 
Employee210
Open Space
Non-turfAcre 785
TurfAcre 1571

 

Recreational

UserUnitRangeTypical
Apartment, resortPerson50-7060
Bowling alleyAlley150-250200
Camp
Pioneer typePerson15-3025
With toilet and bathPerson35-5045
Day, with mealsPerson10-2015
Day, without mealsPerson8-1813
TrailerTrailer75-150125
CampgroundPerson20-4030
Country ClubMembers80-125100
Employee10-1550
Dormitory (bunk house)Person20-4535
FairgroundVisitor1-23
Picnic park with flush toiletsVisitor5-106
Swimming Pool and BeachCustomer5-1510
Employee8-1510
Visitor centerVisitor4-85

 

Institutional

UserUnitRangeTypical
Assembly hallSeat2-43
Medical HospitalBed80-150120
Employee5-1510
PrisonInmate80-150120
Employee5-1510
Rest HomeResident5-12090
Employee5-1510
School, Day
With cafeteria, gym and showersStudent15-3025
With cafeteria onlyStudent10-2015
Without cafe and gymStudent5-1510
School, BoardingStudent50-10075

 

Conversion Factors for Federal Water Use Indices

Volume conversion

1 gallon (gal) = 8.34 pounds
1 cubic foot (ft3) = 7.48 gallons
1 unit (Ccf) = 748 gallons
1 acre-foot (AF) = 325,851 gallons
1 acre-foot (AF) = 43,560 cubic feet
1 million gallons/day (MGD) = 1121 acre feet/year

 

Metric conversions

1 acre = .4 hectares
1 gallon = 3.8 liters
1 cubic foot = 0.3 cubic meters