Nitrate in New Hampshire Well Water

In New Hampshire, nitrate levels average 4.785 mg/L, with a maximum recorded level of 10.191 mg/L. The EPA limit is 10 mg/L. Currently 5.2% of tested wells exceed this limit, affecting approximately 17,680 wells.

Testing for nitrate in New Hampshire typically costs around $79. If treatment is needed, water treatment systems for nitrate cost approximately $3,470.

The risk level for nitrate in New Hampshire is rated as low. The state average of 4.785 mg/L is 10.5% above the national average of 4.332 mg/L.