The attached photos show some of the water bottles we gathered, with GPS coordinates telling where the sample came from, so we can report the data to IoWater. The other photo shows the blue and pink colors, indicating Phosphate (blue) and Nitrate (pink.)
Most of our watershed samples, and our tap water had Phosphates. Not a medical problem, but they add to the Gulf "Dead Zone."
The highest Nitrates came from a creek draining a local golf course! More sampling in the works, with our golf team commissioned to get more samples at different courses.
The attached document details the whole lesson plan and results.