High nitrates out of the tap
My nitrates out of the tap consistently test between 10-20 ppm with the API drop tests. I realize they are not the most accurate tests out there, but I have tested water from other municipalities and they have tested below 5 ppm.
I have contacted the water department and they said that nitrates always leave the plant less than 5 ppm, and that it was likely an inaccurate test kit or "something in the water matrix interfering with the test method".
Could there be something between the plant and my faucet that raises the nitrates?
Could there be something in the water matrix causing a false positive?