These water systems have the highest measured nitrate concentrations, often from agricultural runoff. The EPA maximum contaminant level is 10 ppm.
N/A ppm
Highest Nitrate Level
NaN ppm
Average (Top 25)
10 ppm
EPA Max Level
High nitrate levels can be particularly harmful to infants and pregnant women. Nitrate typically comes from agricultural runoff, fertilizers, and septic systems.
Infants who drink water with high nitrate levels can develop "blue baby syndrome," a serious condition that affects the blood's ability to carry oxygen. If your water exceeds 10 ppm, use bottled water for infant formula.
| Rank | City & System | Nitrate (ppm) | Overall Score | Action |
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