These water systems have the highest measured nitrate concentrations, often from agricultural runoff. The EPA maximum contaminant level is 10 ppm.
13.90 ppm
Highest Nitrate Level
8.84 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 |
|---|---|---|---|---|
#1 | Inver Grove Heights MN1190014 | 13.90 Exceeds EPA max level | F35 | View Details → |
#2 | Thief River Falls MN1570003 | 13.60 Exceeds EPA max level | F35 | View Details → |
#3 | Fergus Falls MN1560028 | 13.00 Exceeds EPA max level | F45 | View Details → |
#4 | Aitkin MN1010001 | 12.94 Exceeds EPA max level | F45 | View Details → |
#5 | CASS LAKE 055294205 | 11.82 Exceeds EPA max level | F30 | View Details → |
#6 | Ely MN1690014 | 11.80 Exceeds EPA max level | F45 | View Details → |
#7 | Mankato MN1070012 | 11.60 Exceeds EPA max level | F20 | View Details → |
#8 | Rochester MN1550003 | 11.50 Exceeds EPA max level | F0 | View Details → |
#9 | Columbia Heights MN1020016 | 10.47 Exceeds EPA max level | F20 | View Details → |
#10 | CASS LAKE 055294204 | 10.40 Exceeds EPA max level | F45 | View Details → |
#11 | ST CLOUD MN1730031 | 9.40 94% of EPA limit | F35 | View Details → |
#12 | Ramsey MN1020035 | 9.38 94% of EPA limit | F45 | View Details → |
#13 | Benson MN1760008 | 8.70 87% of EPA limit | C75 | View Details → |
#14 | Hastings MN1190031 | 8.20 82% of EPA limit | F45 | View Details → |
#15 | Monticello MN1860013 | 7.80 78% of EPA limit | F30 | View Details → |
#16 | Owatonna MN1740007 | 7.30 73% of EPA limit | F45 | View Details → |
#17 | Park Rapids MN1290011 | 6.90 69% of EPA limit | F45 | View Details → |
#18 | Detroit Lakes MN1030006 | 6.30 63% of EPA limit | F45 | View Details → |
#19 | Hutchinson MN1430004 | 5.70 57% of EPA limit | F45 | View Details → |
#20 | Foley MN1050001 | 5.50 55% of EPA limit | F45 | View Details → |
#21 | Blaine MN1020010 | 5.23 52% of EPA limit | C75 | View Details → |
#22 | ST CLOUD MN1730044 | 5.00 50% of EPA limit | C75 | View Details → |
#23 | Blaine MN1020006 | 4.94 49% of EPA limit | B85 | View Details → |
#24 | ROCHESTER MN1550017 | 4.80 48% of EPA limit | C75 | View Details → |
#25 | AITKIN MN1010012 | 4.75 48% of EPA limit | F40 | View Details → |
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