Well Water Interpreter
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Private well answer guide

Nitrate 20 mg/L in Well Water: What Should You Do?

If nitrate is 20 mg/L as nitrogen, it is twice the 10 mg/L drinking water limit. Do not use it for infant formula and use another safe source for drinking until treatment is verified.

Search: nitrate 20 mg/L well water what to doUrgency: Urgent

Tests to run

  • Nitrate as nitrogen
  • Nitrite
  • Bacteria
  • Chloride

Next steps

  • Confirm the result and unit with a certified lab.
  • Use bottled or treated water for infants, pregnancy, drinking, and cooking.
  • Investigate nearby septic, fertilizer, manure, or surface water sources.
  • Install certified nitrate treatment and retest after installation.

FAQ

Can nitrate be removed from a whole house well system?

It can, but many households choose point-of-use treatment for drinking water first because whole-house nitrate treatment requires careful design and maintenance.

Can adults drink water with nitrate at 20 mg/L?

It is above the drinking water limit. Ask local health officials or a clinician for household-specific guidance, especially for pregnancy or medical conditions.

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