Trace Elements
Uranium and radon were analyzed for all study areas. Uranium was not present in the Mahomet Aquifer due to the presence of reducing conditions, immobilizing uranium. Uranium was present in the other study areas, occuring in 52 percent of the samples in the shallow glacial-drift aquifers. The highest uranium detection was 17 micrograms per liter (mg/L), which did not exceed the current drinking water standard of 20 mg/L. Uranium did not correlate well with phosphorus or ortho-phosphorus, indicating that uranium is natural and not from anthropogenic agricultural fertilizer sources.

Radon was present in all study areas, with higher concentrations being present in the shallow aquifers. The highest concentration was 1300 picocuries per liter (pCi/L). Forty-five percent of the radon detections had concentrations above 300 pCi/L. Radon had no correlations with any water-quality constituent. Radon is primarily a function of the borehole geology because of the short, 3.8 day half-life of radon and comparatively slow ground-water travel velocity.