Figure 1.4

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EXPLANATION

[>, greater than; ≤, less than or equal to]

Predicted probability of arsenic greater than 5 or 10 milligrams per liter

0 to 0.15
>0.15 to 0.3
>0.3 to 0.5
>0.5 to 0.7
>0.7 to 1

Predicted probability of manganese-reducing conditions as indicated by manganese concentration ≥ 50 micrograms per liter in groundwater that is
5 meters and 100 meters below the water table

0 to 0.1
>0.1 to 0.3
>0.3 to 0.5
>0.5 to 0.7
>0.7 to 1.0

Predicted lithium concentration in groundwater in the typical domestic and public supply well depth zone

≤4
>4 to 10
>10 to 30
>30

Predicted probability of oxic conditions in groundwater that is
5 meters and 100 meters below the water table

0 to 0.1
>0.1 to 0.3
>0.3 to 0.5
>0.5 to 0.7
>0.7 to 1.0

Predicted groundwater nitrate concentration in the typical domestic and public supply well depth zone

0 to 1
>1 to 2.5
>2.5 to 5
>5 to 10
>10

Predicted probability of per- and polyfluoroalkyl substances (PFAS) occurrence in groundwater in the typical domestic and public supply well depth zone

0 to 0.3
>0.3 to 0.5
>0.5 to 0.75
>0.75 to 1

Figure 1.4. Interactive, searchable map showing selected groundwater-quality model results in the conterminous United States.

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