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  • Title: Nitrates in Wisconsin ground water.
    Author: Schuknecht B, Lawton GW, Steinka P, Delfino JJ.
    Journal: Environ Lett; 1975; 9(1):91-8. PubMed ID: 1183417.
    Abstract:
    Nitrate analyses were performed on ground water well samples originating from sources throughout Wisconsin. The data ranged from below the analytical detection limit up to 140 mg NO3-N/1. Over nine percent of all wells sampled has nitrate concentrations in excess of 10 mg NO3-N/1. Six individual counties had more than 10 mg NO3-N/1 in at least twenty percent of the wells covered in this survey. However, data reported for over eight thousand new wells driven in 1971-1972 showed only slightly more than two percent with nitrate levels above 10 mg NO3-N/1. This reflected the trend toward drilling deeper wells which are influenced less by nitrate seepage as well as adherence to new and stricter well construction codes.
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