Science Fair Project On Water Quality

Does Water Quality Affect Plant Growth?

There are several variables that affect how plants grow.  The amount of sun light, and water that plants get can cause them to grow quicker or slower than average.  This science fair project, aimed at students in middle school or high school, is going to show whether or not water quality affects plant growth.  Specifically, students are going to find out whether or not gray water is viable for growing flowers, grass and other non-edible plants.

Gray water is water that has been previously used by a household, and is typically the water that goes down your drain.  So, what is your hypothesis?  Will plants that are grown in the water that you use to wash your clothes in, shower in or wash the dishes in produce plants that are smaller, the same size or bigger than plants that are getting fresh water from the tap?

The only equipment that you will need for this project is soil, 16 pots, seeds and of course, water.  Make sure to put the same amount of soil in each pot, and add seeds.  It doesn’t matter whether you want to plant grass seeds, flower seeds or other plant seeds.  However, if you want quick results, choose grass seeds, because they grow very fast.   Make sure to mark each pot with ‘fresh water’ or ‘gray water’ so that you'll know which water each plant should get. 

When watering your plants every other day, you should make sure to give each pot the same amount of water, and each group of pots should have the same access to heat and light to ensure a level playing field.  The gray water plants are going to get water from different sources.  Some of the time, you can give them water from the washing machine, other times, you can wash your hands in a bowl and give them that water, and other times they might get water from the sink after you wash the dishes but before you pull the plug.  Don't purposely make the water dirtier or cleaner than it is.

Measure your results weekly for a period of four weeks.  What are the results?  Did the plants that were getting fresh water do a lot better, the same or worse than the plants that were getting gray water?  Is using gray water to water our lawns and flowers a viable solution?

Remember that in a science fair project you want to be as accurate and as meticulous as possible when measuring and reporting your results.  Make sure to write down the results in as much detail, and if you can, take pictures of the process so that you can back up the data with more evidence.

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