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General Environmental Science Science Fair Project

Reducing Nitrate Levels in Water

Reducing Nitrate Levels in Water | Science Fair Projects | STEM Projects
Nitrates from fertilizers are polluting our rivers, lakes, and oceans. Denitrifying bacteria can help reduce these levels by releasing nitrogen gas back into the atmosphere. Let's find out how!


The hypothesis is that nitrate-rich water containing denitrifying bacteria will exhibit a faster rate of reduction in nitrate levels.

Method & Materials

You will measure and pour water into beakers, add denitrifying bacteria, cover the beakers with plastic wrap, and measure the nitrate levels in each beaker over the course of three weeks.
You will need 2000 milliliters of water from an algae-rich pond, a plastic container with 2 liter capacity, 15ml of Nitrobacter and Nitrosomonas bacteria, 6 beakers, a measuring cylinder, a syringe, a roll of plastic wrap, and a nitrate test kit.


The experiment showed that the beakers with the denitrifying bacteria added had a faster rate of reduction in the nitrate levels. This proves that the hypothesis is true.

Why do this project?

This science project is interesting and unique because it shows how denitrifying bacteria can help reduce nitrate levels in water and save the aquatic ecosystem.

Also Consider

Variations of this experiment could include testing the levels of ammonia and nitrite in water, or comparing the effect of denitrification in water samples from different sources.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related video

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