The WHO guideline is 50 as ...
Published by Joseph Cotruvo, President at Joseph Cotruvo & Associates, Water , Environment and Public Health
The WHO guideline is 50 as Nitrate.. The US standard is 10 as N. They are virtually equivalent, but just different computing methods. If Carlos has 80 as N, that's a huge amount. It must be receiving a lot of fertilizer runoff or infiltration.