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Waterless urinals and hygieneFeatured science projectScience project video


This science fair project was done to determine if waterless urinals are more hygienic compared to the conventional water-based urinals. The experiment was done by taking bacteria samples from waterless urinals and water-based urinals to compare for variances in bacteria growth.


Waterless urinals will have less bacteria compared to the water-based urinals.

Scientific Terms

Sanitation, urine, sterile, aerosol, germs, bacteria, gravity


Waterless urinals

Billions of liters of water is flushed down toilet bowls and urinals daily and this drains (literally) our country’s limited fresh water resources. The water that is flushed down also needs to be treated in septic tanks and water treatment facilities before being recycled and returned to the environment. Waterless urinals are an alternative to the conventional water based flushing system. These waterless urinals help us to save water and they also incur lower maintenance costs.

The use of water in flushing causes an aerosol effect every time flushing takes place. This spreads germs all over the rest room. Waterless urinals do not use water and depend on gravity to pull the water into the drain. Waterless urinals use an oil-based deodorant liquid that filters urine and traps odors. Urine simply passes through the filter and into the waste system.

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Complexity level:
Project cost ($):
Time required:
1 day to prepare, 5 days for the science project experiment
Material availability:
Easily found
Safety concerns:

The agar in the Petri dishes should be properly disposed of and the Petri dishes decontaminated after the experiment. This can be done by washing the Petri dishes with bleach.