Randy Holmes-Farley
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Have you tried sending in your water to be tested? It's famously difficult for one to be able to read nitrates at an accurate level with hobby level kits. I'd be interested in knowing what your actual levels are at. I haven't looked much into ICP testing for nitrates, but maybe @Randy Holmes-Farley will have more to say on that.
ICP cannot quantify nitrate (ICP only counts atoms, and nitrate, with N and O has many atoms in common with other things, such as N2 and O2 gases, many organics, ammonia, etc.).
But ICP companies may provide other testing services that give the nitrate value.