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Nitrates in Wisconsin ground water
Environmental Letters
|January 1, 1975
Summary
Wisconsin groundwater nitrate levels exceeded 10 mg NO3-N/L in over 9% of wells. Newer, deeper wells drilled post-1971 show significantly lower nitrate contamination, indicating improved construction and reduced seepage.
Area of Science:
- Environmental Science
- Hydrogeology
- Water Quality Analysis
Background:
- Groundwater contamination by nitrates is a significant environmental concern.
- Wisconsin's groundwater resources are vital for drinking water and agriculture.
- Elevated nitrate levels pose risks to human health and aquatic ecosystems.
Purpose of the Study:
- To assess the prevalence and distribution of nitrate concentrations in Wisconsin groundwater wells.
- To identify factors influencing nitrate levels in different well types and locations.
- To evaluate the impact of well construction practices and depth on groundwater quality.
Main Methods:
- Analysis of nitrate concentrations (NO3-N) in groundwater samples from various Wisconsin wells.
- Statistical analysis of data, categorizing results by well depth, location, and construction date.
- Comparison of nitrate levels between older and newer well datasets.
Main Results:
- Nitrate concentrations in sampled wells ranged from below detection limits to 140 mg NO3-N/L.
- Over 9% of all sampled wells exhibited nitrate concentrations exceeding 10 mg NO3-N/L.
- Wells drilled in 1971-1972 showed a marked decrease in nitrate levels (approx. 2%), correlating with deeper drilling and stricter construction codes.
Conclusions:
- Groundwater nitrate contamination is present in Wisconsin, with specific areas showing higher prevalence.
- Deeper wells and adherence to modern construction standards effectively mitigate nitrate seepage.
- Continued monitoring and promotion of best practices are essential for safeguarding groundwater quality.