How to Read Well Water Lab Report Units

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.

Search: how to read well water lab report unitsUrgency: Routine

Tests to run

Nitrate
Arsenic
Lead
Bacteria
pH
Hardness

Next steps

Find the analyte name exactly as written on the lab report.
Check the unit before comparing to a limit or treatment claim.
Prioritize present/absent bacteria, nitrate, arsenic, lead, and other health flags.
Use the app to keep each result, unit, and retest date together.

FAQ

Is mg/L the same as ppm?

For many water results, mg/L is approximately ppm, but always follow the lab's units and contaminant-specific guidance.

Is ppb the same as ug/L?

For water, ppb is commonly equivalent to micrograms per liter, written as ug/L or mcg/L.

Download iOS App

Interpret once on the web. Track forever in the app.

Save test history, set annual reminders, compare results over time, and create a shareable report.

Download the iOS app

Educational guidance only. Always confirm important decisions with a certified laboratory, local health department, qualified water treatment professional, or clinician.