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WellsApril 7, 2026·8 min read
Nitrate in Well Water: Why Infants and Pregnancy Need Extra Care
Nitrate is a common well-water issue. Here is how it causes methemoglobinemia, what the EPA limit means, and why RO is often the fix.
WC
By WaterCheckup · Editorial · NSF/WQA-aligned guidanceIs your water affected?
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Nitrate (NO₃) in drinking water is odorless and tasteless. It often comes from agricultural runoff, septic systems, and animal waste — especially in rural areas.
Infants: High nitrate can cause methemoglobinemia (“blue baby syndrome”) in infants under six months. Do not use nitrate-contaminated water for formula — and boiling does not remove nitrate (it can concentrate it).
EPA limit
The MCL for nitrate (as nitrogen) is 10 mg/L in public systems. Private wells are not monitored by EPA — owners must test.
Pregnancy
Discuss elevated nitrate with your clinician. Many public health agencies recommend caution when nitrate is high or borderline.
Treatment
Point-of-use reverse osmosis is commonly used for nitrate reduction for drinking and cooking. Whole-house systems require proper sizing and maintenance — work with a qualified professional for well water.
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