Private well answer guide
Always compare a result with the correct unit. Nitrate as nitrogen is not the same as nitrate as nitrate, ppb is much smaller than mg/L, and bacteria are often reported as present or absent.
For many water results, mg/L is approximately ppm, but always follow the lab's units and contaminant-specific guidance.
For water, ppb is commonly equivalent to micrograms per liter, written as ug/L or mcg/L.
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