

![]() | Project title | Does bacteria content increase in a water bottle when the bottle is not properly washed.![]() |
| Difficulty Level | High school | |
| Main link | Click here to view all details of this science project (Cached)  (View 3rd party site) | |
Description | ||
| My purpose is to show that the bacteria content does increase in a water bottle when it is not properly washed between uses. In the summer during swim team, I see my teammates fill the same water bottle every day for the whole season. They do not wash the water bottles as evidenced by the lip-gloss colors that don’t go away. The water bottles are stored in their swim bags with moldy dirty towels or they rattle under the seats of their parents’ cars. Also I am doing this experiment in the winter when the temperatures are cooler and bacterial growth tends to be slower than during the hot summer months. If the bacteria do grow in my experiment, the bacteria growth could be greater during the summer months. | ||
Materials | ||
| This idea is contained in a third-party website. To view the science fair projects, please click on the link above. Copyright in the third party website belongs to the relevant author. | ||
Brief Instructions | ||
| [Please see third-party website for instructions] | ||