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back to WasteLess Business ProjectLow-flow Restroom Fixtures
LaGuardia Airport
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The Port Authority of NY & NJ at LaGuardia Airport (PA-LGA) is installing low-flow water devices as restrooms are renovated. PA-LGA has renovated approximately 78 percent of its restroom fixtures. As part of the ongoing renovations, PA-LGA implemented a water conservation program, which involved the following initiatives:
  • Established a leak detection and prevention program to reduce wasted water. A faucet drip or invisible leak in the toilet could result in up to 15 gallons of wasted water per day, or 5,475 gallons of wasted water per year.
  • Installed low-flow toilets. Ultra-low-flow toilets use only 1.6 gallons of water per flush. Older toilets use 3.5 to 5 gallons per flush.
  • Installed high-efficiency, low-flow faucets and aerators on all faucets. These use water at a rate of 0.5 gallons per minute (gpm), as compared to standard faucets, which use 3 gpm.
  • Installed flow restrictors on all showerheads. Each showerhead was reduced from a 4.5 gpm shower head to high performance 2.5 gpm models.

The following table shows a brief cost analysis of the water conservation initiatives undertaken at LaGuardia Airport.

ANALYSIS FOR RESTROOM WATER CONSERVATION PROGRAM

   

Before

After

Fixture costs1

     
 

Showers

—    

$250

 

Sinks

—    

$48,320

 

Toilets

—    

$41,175

Total Cost of Fixtures

   

$89,745

Estimated yearly water usage (gallons)

     
 

Showers2

$246,375

$136,875

 

Sinks3

$10,995,600

$4,581,500

 

Toilets4

$57,750,000

$32,043,000

Total yearly water usage (gallons)5

 

$68,991,975

$36,761,375

Cost of water6

 

$115,303

$61,437

Cost of sewage7

 

$183,378

$97,710

Total yearly water and sewage costs

 

$298,681

$159,147

Savings

   

$139,534

Payback period (months)8

   

8



  1. Low-flow showerheads, faucet/aerators, and auto-flush toilets, respectively, cost approximately $25, $302, and $225 each.
  2. Low-flow showerheads reduce water use from 4.5 to 2.5 gpm (44 percent). Ten showerheads have been replaced. Typical shower usage is 30 showers per day for five minutes, 365 days per year.
  3. Low-flow auto-flush faucets reduce water use from 3 to 0.5 gpm per fixture (83 percent). As of spring 2003, 160 of 228 (70 percent) low-flow faucets have been installed. Typical faucet usage is once per passenger for 10 seconds. Approximately 22 million passengers visit the airport yearly.
  4. Low-flow auto-flush toilets reduce water use from 3.5 to 1.6 gpm per fixture per flush (54 percent). As of spring 2003, 183 of 223 (82 percent) low-flow toilets have been installed. The number of toilet flushes per day is based on the assumption that all visiting passengers flush the toilet once. It is assumed that the male/female ratio of passengers is 50/50 and 50 percent of male passengers will only use a urinal. This makes the base figure for the number of toilet flushes a year 16.5 million.
  5. Water reduction rates for urinals are not included in calculations because data on usage rates was not available. As of spring 2003, 89 out of 104 (86 percent) urinals have been replaced.
  6. Water costs are $12.50 per 1,000 cubic feet. Number of cubic feet = number of gallons x 0.1337
  7. Sewage treatment costs are 159 percent of water costs or $19.88 per 1,000 cubic feet. Number of cubic feet = number of gallons x 0.1337
  8. Payback period is Total cost of fixtures/savings x 12.

Source: NYC WasteLe$$ Business Project findings and conversation with Port Authority at LaGuardia Airport facilities management, Spring 2003

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